 |  | Operator Station
A technologically advanced cab, featuring joystick controls, provides unmatched comfort and visibility. |
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Advanced Joystick Controls
The change from traditional levers to joystick controls was driven by motor grader customers who wanted a machine that was easier to learn and operate. This revolutionary feature integrates eight hydraulic functions and a steering wheel into two electro-hydraulic joystick controls. The joystick controls reduce hand and wrist movement by an astounding 78% compared to conventional lever controls for greatly enhanced operator efficiency.
This Cat-exclusive feature:
· Reduces fatigue
· Increases operator comfort
· Provides ease of multifunctional capabilities
· Increases productivity
· Is easy to learn
· Provides precise implement control
M-Series joystick controls greatly enhance all areas of machine performance. |
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Auxiliary Pod and Ripper Control
The auxiliary pod is positioned directly adjacent to the right-hand joystick for easy access and operation. Four fingertip controls and a miniature joystick command up to six hydraulic functions, providing consolidated control for operation of additional work tools when equipped.
The optional ripper control pod has been ergonomically positioned to allow for a comfortable view of the ripper and front lift group during use. Its stand-alone, stabilized mounting ensures secure operation. |
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Visibility
A variety of design modifications have dramatically enhanced cab visibility for the M-Series, improving operator confidence, productivity and safety. Removing the control levers and relocating the hydraulic valves from beneath the cab enables the doors to be angled, opening up new lines of sight to the moldboard. In addition, the sloped and tapered engine enclosure and a patented, sloped rear window provide clear sight lines to the rear of the machine and ripper. |
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 | | Cat Comfort Series Seat
The Cat® Comfort Series suspension seat has an ergonomic high-back design with extra thick contoured cushions, providing maximum operator comfort. The seat provides infinitely adjustable lumbar support and additional back support by evenly distributing the operator’s weight. Seat controls are easy to grab and are located within reach. The optional air suspension seat enhances ride quality for additional comfort. |
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 | | In-Dash Instrument Cluster
The compact gauge cluster is located directly in front of the operator in a redesigned console, improving operator visibility that further increases confidence and efficiency. The instrument cluster, with easy-to-read, high-visibility gauges and warning lamps includes:
Analog:
· Tachometer
· Articulation Angle
· Fuel Gauge
· Hydraulic Oil Temperature
· Coolant Temperature
Digital:
· Ground Speed
· Actual Gear and Direction
· Operator Requested Gear and Direction
· Service Hour Meter |
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Cat Messenger
Cat Messenger provides real-time machine performance and diagnostic data. You can quickly view warnings and operating information in multiple languages, in addition to those shown on the gauge cluster in the dash. The operator is able to toggle through the menus to view system data and set machine parameters. Cat Messenger will also show machine faults or warnings in text for easy operator understanding. |
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Controls and Switches
Reliable, long-life rocker switches are conveniently located within reach on the right-hand cab post and front instrument cluster. Controls and switches are backlit for increased safety during nighttime operations, while the backlighting can be adjusted through Cat Messenger.
Right Side Cab Post Switches may include:
· All exterior lights
· Hydraulic lockout
· Electronic throttle control
· Autoshift
· Centershift lock
· Defroster fan
· Blade cushion (hydraulic accumulators)
· Heated mirrors
Front Instrument Cluster Switches include:
· Parking Brake
· Secondary steering test |
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 | | Comfort and Convenience
Caterpillar has built the most comfortable cab in the industry by replacing the control levers and steering wheel with two joystick controls. The redesigned 160M cab gives operators more leg room and space to adjust the seat. Armrests can be tilted and adjusted vertically, wrist rests are adjustable vertically, and the joystick pods are adjustable fore/aft and vertically. This helps keep the operator fresh and productive at all times.
Ergonomic pedal repositioning enhances operator comfort and reduces fatigue. With additional space, optimized controls, greater comfort and visibility, the 160M cab promotes safe, efficient and comfortable machine operation. |
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 | | Optional HVAC
The optional heating, ventilation and air conditioning system is fully integrated into the design of the cab. Six operator facing and nine defrosting adjustable vents provide consistent climate control and clear windows for every condition. The high-capacity system dehumidifies air and pressurizes the cab, circulating fresh air and sealing out dust. An easily accessible fresh air filter is located outside the cab at ground level for quick replacement or cleaning. |
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Optional HVAC Precleaner
The HVAC Precleaner unit was developed to extend the service intervals of the primary fresh air filter. The powered centrifugal design effectively removes dirt particles before entering the cab fresh air ducts. The precleaner unit mounts on the left-rear portion of the cab roof and is factory installed.
Some benefits of the HVAC precleaner are:
· Maintains designed cab pressurization over extended operating periods
· Compact, integrated filter system
· Reduces system maintenance intervals
· Extends filter service interval up to 10 times |
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Low Interior Sound and Vibration Levels
Isolation mounts for the cab, engine, and transmission maximize operator comfort by significantly reducing sound and vibration. Relocating the valve groups from beneath the cab to the front frame and moving the hydraulic pump to the engine compartment, reduces cab vibration, heat and noise. These modifications provide a quieter and more comfortable working environment, optimizing operator focus and productivity. |
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Additional Cab Features
Additional cab features include cup holder, lighter and ashtray, coat hook, storage area, night time light, power port and heater. Optional rearview camera, 25 amp power converter and satellite radio are also available. |
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 | | Steering and Implement Controls
Two joysticks offer precise control and unparalleled ease of operation. This advanced technology makes the 120M the most operator-friendly motor grader in the world. |
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Ease of Operation
The revolutionary joystick controls and exceptional visibility make the 120M easier to operate without sacrificing control. The intuitive joystick control pattern allows both new and experienced operators to become productive quickly. Logical grouping of hydraulic functions in the joysticks allow any operator to easily control several functions at the same time. This allows the operator to be more productive and remain comfortable throughout the work shift. |
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Intuitive Steering Control
The 120M introduces a breakthrough in joystick steering control. This technology creates a direct relationship between the lean angle of the joystick and the turning angle of the steer tires. A brake tensioning system holds the joystick in position until the operator moves it. In addition, the steering control automatically reduces steering sensitivity at higher ground speeds for comfortable and predictable control. |
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Electronic Throttle Control
Electronic Throttle Control (ETC) provides the operator with easy, precise and consistent throttle operation allowing the operator to accurately match speed to conditions. ETC modes and functions are:
ETC Modes:
· Three position switch located on right hand cab post
· Allows operator to select Auto, Manual or Off Mode
· Auto Mode (top switch position) - allows operator to set desired engine speed. Movement of brake or accelerator pedal disables ETC.
· Manual Mode (bottom switch position) - allows operator to set desired engine speed and increase speed past throttle setting by pressing the accelerator pedal. When released, machine returns to preset ETC speed. Movement of brake disables ETC.
· Off Mode (center switch position)
Set and Increment:
· Rocker switch on right hand cab post
· Allows operator to set engine speed
· Push top of switch to set engine speed
· Push top of switch again to increase engine speed by 100 RPM
· Push and hold top of switch to increase engine speed by 700 RPM per second
Decrement and Resume:
· Trigger switch located on front of right joystick
· Allows operator to resume ETC and decrease engine speed
· Click trigger to resume engine speed (if ETC already set)
· Click trigger to decrease engine speed by 100 RPM increments (if ETC is engaged)
· Hold trigger to decrease engine speed by approximately 700 RPM per second |
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 | | Left Joystick Functions
The left joystick primarily controls the machine direction and speed.
1 - Steering: Lean joystick left and right
2 - Articulation: Twist joystick left and right
3 - Articulation Return to Center: Yellow thumb button
4 - Wheel Lean: Two black thumb buttons
5 - Direction: Index trigger shifts transmission to forward, neutral or reverse
6 - Gear Selection: Two yellow thumb buttons upshift and downshift
7 - Left moldboard lift cylinder: Push joystick to lower, pull joystick to raise
· Left moldboard lift cylinder float: Pushing joystick through detent engages float |
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Articulation Return-to-Center
Articulation Return-To-Center is an industry exclusive feature utilizing the electro-hydraulic platform. The operator can automatically return the machine to a straight frame position from any articulation angle with the press of single-button. The Return-to-Center feature helps improve productivity and safety by allowing the operator to focus on controlling the moldboard. |
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 | | Right Joystick Functions
The right joystick primarily controls the Drawbar, Circle and Moldboard functions.
1 - Right moldboard lift cylinder: Push joystick to lower, pull joystick to raise
· Right moldboard lift cylinder float: Pushing joystick through detent engages float
2 - Moldboard slide: Lean joystick left and right
3 - Circle turn: Twist joystick left and right
4 - Moldboard tip: Thumb switch fore and aft
5 - Drawbar center shift: Thumb switch left and right
6 - Electronic Throttle Control: Trigger switch is resume and decrement
7 - Differential Lock/Unlock: Yellow button |
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 | | 1 - Ripper Control Pod
The ripper control pod has been ergonomically positioned next to the right-hand joystick. The infinitely variable roller switches control the rear ripper and/or front lift group (when equipped) for easy and comfortable control, while the stabilized mounting ensures secure operation. If the machine has one or two auxiliary hydraulic functions, the ripper control pod is provided and the left-hand switch that controls the front lift group has float capability. |
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2 - Programmable Auxiliary Hydraulic Pod
The optional auxiliary pod is positioned directly adjacent to the right hand joystick for easy access and operation. Four finger tip controls and a miniature joystick command up to six hydraulic functions, providing consolidated control for work tool operations.
The auxiliary hydraulic pod is provided in addition to the ripper control pod when the machine is configured with three or more auxiliary functions. The controls are pre-programmed at the factory or can be reprogrammed to the customer's preference by a service technician through Cat ET.
Pod functions include:
Mini joystick:
· Fore/Aft moves the wing toe up or down
· Left/Right moves the wing heel up or down
Programmable fingertip controls are all push/pull and contain the following functions:
· Front Lift Group
· Right and Left Dozer Angle
Float Capabilities:
· Index Finger
· Little Finger
· Right/left on mini joystick |
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 | | Structures, Drawbar, Circle and Moldboard
The 120M frame provides a solid working platform, and the DCM delivers service ease and precise blade control for maximum productivity. |
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Front Frame Structure
The 120M front frame is a formed structural carbon steel tube. Advanced fabrication technology uses a single steel plate that is formed into shape and resistance welded, producing a robust tube. Evenly distributing stress loads increases durability of the frame. This process will also significantly reduce weld joints that, in turn, increase durability and factory throughput. |
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Rear Frame Structure
The box-sectioned hitch design helps resist torsion loads and ensure structural durability. The cast axle mounting supports the rear axle, utilizing a bolt-on design for increased serviceability. The box-sectioned channels connect to the integrated bumper, tying the rear frame together as one unit so the frame can withstand heavy-duty applications such as ripping and winging snow. |
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Articulation Hitch
A large tapered roller bearing at the lower pivot carries loads evenly and smoothly. This joint is sealed to prevent contamination in this critical area. A mechanical locking pin prevents frame articulation to ensure safety when servicing or transporting the machine. |
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Circle Construction
Caterpillar circles are rolled ringed seamless steel forgings built to stand up to high stress loads and provide structural durability. The uniformly spaced circle teeth are flame cut for accurate positioning and smooth finishing on the working surfaces. The front 240° of circle teeth are heat induction hardened to reduce wear and ensure component reliability. For maximum support, the circle is secured to the drawbar by six circle support shoes. The raised wear surface area on top of the circle extends the component life of the circle and drawbar. |
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Drawbar Construction
The A-frame drawbar uses a tubular design for high strength and optimum durability. A 20 mm (.8 in) “yoke” plate has been added for additional strength that extends from the circle area to the front of the drawbar. |
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Aggressive Blade Angle
The Caterpillar M-Series features a long wheelbase that provides space to quickly position the blade at an aggressive angle without interfering with front or rear tires. The aggressive angle keeps the material rolling along the moldboard. This versatility prevents an undesirable bulldozing effect and ultimately requires less power to get the job done. This is particularly helpful when handling very dry materials or cohesive soils. |
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 | | Top-Adjust Drawbar Wear Strips
The patented top-adjust wear strips dramatically reduce drawbar/circle adjustment time. By removing the access plates on top of the drawbar, shims and wear strips can easily be added or replaced by a single technician, without removing the circle. Covering the same surface area as the H-Series machines, the 20 mm (.78 in) thick wear inserts are designed for extended life. This feature cuts service downtime and lowers the overall machine operating costs for customers. |
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Replaceable Wear Inserts
Tough, durable nylon composite wear inserts reduce rotational friction for maximum circle torque and longer component life. They are located between the drawbar and circle, and between the support shoes and circle. High load-resistant brass wear strips are placed between the blade mounting group and moldboard. This sacrificial wear system can be replaced easily and helps keep components tight for fine grading. |
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 | | Shimless Moldboard Retention System
The unique, shimless moldboard retention system reduces the potential for blade chatter. Vertical and horizontal adjusting screws keep the moldboard’s wear strips aligned for precise blade control and dramatic reductions in service time. |
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Moldboard
The optimal curvature and large throat clearance help move material quickly and efficiently in all soil types. These features, in addition to maintaining the proven H-series moldboard surface area and blade curvature, give the 14M excellent load distribution and minimal material buildup into the circle area while allowing large blade loads to roll freely. Heat-treated moldboard rails, hardened cutting edges and end bits, and large diameter bolts assure reliability and longer service life. The moldboard side shift rails are welded to the moldboard using a uniform continuous submerged arc welding technique for superior strength. The side shift cylinder is positioned on the left side to eliminate snow wing interference. |
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Moldboard Positioning
The five-hole link bar design extends the possibilities for moldboard positioning and is most beneficial in mid-range bank sloping and in ditch cutting and cleaning. During mid-range bank sloping, the machine can remain on the ground and off the slope. In ditching applications, the blade can reach far out and down, which keeps the machine on a dry, level surface. This results in a high production potential. |
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 | | Power Train
An electronically controlled power shift transmission assures smooth shifting and maximum power to the ground. A modular rear axle and hydraulic brakes simplify serviceability and reduce operating costs. |
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Smooth Shifting Transmission
The 120M combines several key innovations to ensure smooth, powerful shifts throughout the gear range. |
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Electronically Controlled Shifting
The full Electronic Clutch Pressure Control (ECPC) system optimizes inching modulation and smooths shifting between all gears and directional changes. This is performed by electronically controlling shifts at the correct time and modulating the engagement of the clutches. ECPC provides outstanding control and also extends the life of the transmission by placing less stress on transmission gearing while reducing operator fatigue. |
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Load Compensation
This standard feature ensures consistent shift quality regardless of blade or machine load. Electronic Control Modules (ECMs) process input from the engine and estimate the load on transmission to automatically adjust the clutch engagement rate. Load compensation protects the clutch and ensures smooth shifts. |
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Viscosity Compensation
This oil selection feature allows the machine to take into account varying oil weights for consistent hydraulic performance. The calibration is fully integrated into the machine and can be performed using Cat Messenger. It allows the operator to select oil weight for optimized shift performance. At extreme cold temperatures, this feature pre-primes the clutches for optimum operation. |
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Controlled Throttle Shifting
This standard feature helps to smooth directional and gear changes without use of the inching pedal by momentarily reducing engine speed for optimal shift points for directional changes and some key forward gear changes.
The advantages of controlled throttle shifting (CTS) include improved shift quality, controlled clutch friction and heat generation during the shift, dampening of any torque reaction at the spring coupling between the engine and transmission, reduced operator fatigue and less affected worked-ground conditions. The introduction of CTS places the M-Series Motor Grader as the market leader in transmission shift quality. |
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Shuttle Shifts (Directional Shifts)
The M-Series transmission allows direction changes without using the inching pedal to control clutch engagement. Designed with electronically controlled proportional valves and an advanced shift control strategy, the M-Series transmission precisely controls the engagement of the directional clutches for a very smooth transition from one direction to the other.
This new type of shift is called the 'shuttle shift.' The transmission can perform shuttle shifts up to 3rd gear. For example, if the operator was travelling in 2nd Forward gear, a flip of the direction index trigger will move the transmission into the 2nd Reverse gear. The same applies to 1st gear and 3rd gear, respectively. If the operator is travelling in a gear greater than 3rd and requests a shuttle shift, the transmission shift control logic will automatically downshift the transmission from the current gear to 3rd and perform a 3-to-3 shuttle shift. Additional shuttle shifts can be performed under more advanced operator input conditions. |
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Engine Over-Speed Protection
Electronic over-speed protection helps prevent engine and transmission damage, and extends component life caused by premature downshifting or grade-induced over-speeding. The electronic controller will prevent a downshift from occurring until the engine has slowed to 2600 RPM. The transmission will automatically up-shift if the machine speed increases beyond the capability of the selected gear between 1st and 7th gear forward. |
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Power Shift Countershaft Transmission
Designed and manufactured specifically for the 120M motor grader, the direct drive countershaft transmission is matched with the powerful Cat C6.6 engine to maximize power to the ground. |
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Direct Drive
Delivers superior fuel efficiency and “feel” of blade loads, material hardness and ground speed. |
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Modular Rear Axle
The 120M incorporates a bolt-on modular rear axle design, allowing easy access to differential components, improving serviceability and contamination control, and lowering maintenance time and operating costs. |
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 | | Front Axle
The Caterpillar® sealed spindle keeps the bearings free from contaminants and lubricated in a light-weight oil (1). This durable low maintenance design reduces the customer’s owning and operating costs because repacking with grease is never required. Two tapered roller bearings (2) support the wheel spindle. The Cat “Live Spindle” design places the larger tapered roller bearing outboard where the load is greater, extending bearing life. |
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Gear Selection
Eight forward and six reverse gears give the operator a wide operating range. The specifically designed range of gears ensures maximum productivity in all earthmoving applications. |
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Inching Pedal
The robust pedal allows precise control of the machine with low pedal effort and superior modulation. The electronic control module (ECPC), which controls the transmission, allows optimum inching modulation for each specific gear, providing the operator better control and feel when inching is needed. No inching pedal is required for directional or gear changes. Precise control of machine movements is especially important in finish grading or other close-quarter work. |
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Programmable Autoshift
The optional autoshift allows the operator to easily customize various shift parameters through Cat Messenger to match the specific application requirement. The operator can select a specific range of gears to work in so that the machine will automatically shift the transmission at optimal points. This allows the operator to focus on the work, improving safety, productivity and ease of operation. |
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 | | Hydraulic Brakes
Caterpillar designs and manufactures oil-bathed, hydraulically actuated (1), multi-disc brakes that are completely sealed. These provide smooth, predictable braking and lower operating costs. With the largest total brake surface area in the industry (2) of 5750 cm˛ (891 in˛), the 120M delivers dependable stopping power and longer brake life. |
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Brake Serviceability and Reliability
A brake wear indicator/compensator system (3) maintains consistent brake performance and indicates brake wear without disassembly. This system is located on the wheel housing behind the tires. The customer can adjust the stop rod to allow consistent brake piston travel as the frictional material wears, and also check remaining life at the same time. The system's integrated functions cut service time and extend brake service life. |
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Parking Brake
The spring-applied, hydraulically released multi-disc parking brake is automatically engaged with the operator presence system, and can be easily serviced without transmission removal to reduce operating cost. A sealed, oil-cooled design extends component life and reduces the need for service. |
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 | | Engine
The Cat C6.6 engine combines power management with ACERT™ Technology to deliver maximum power and efficiency in every gear while reducing the environmental impact. |
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| | Exhaust Emissions Compliant
Illustrating the Cat commitment to environmental responsibility, the M-Series ACERT Technology engine operates in a clean and quiet way. With reductions in NOx, hydrocarbon and particulate emissions, it meets or exceeds U.S. EPA Tier 3 and European Union Stage IIIa standards.
Caterpillar engines with ACERT Technology can meet exhaust emissions regulations without using ultra-low sulphur diesel (15 parts per million). The M-Series machines can use the same fuel as the H-Series (500 parts per million) without sacrificing engine life. |
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ACERT™ Technology
ACERT Technology represents a series of revolutionary and incremental improvements developed by Caterpillar that reduces emissions at the source. It is sometimes easier to think of ACERT Technology as a series of building blocks used by Caterpillar to optimize engine performance while meeting U.S. EPA Tier 3 and European Stage IIIa regulations.
This breakthrough technology reduces combustion temperatures and emissions during the combustion process by using advanced technology in the air and fuel systems, in conjunction with integrated electronics. The electronically controlled fuel system allows for multiple injections of small amounts of fuel in each combustion cycle, allowing for more complete fuel burn and in turn reducing combustion temperatures.
Combining this with an advanced air system provides more cool air in the combustion chamber and controls the air volume required at various loads and speeds. It automatically adjusts to the requirements of the engine at any particular time, providing optimum power and fuel economy, while reducing emissions with continued durability and improved performance.
The C9 engine features a water-cooled center-section, waste-gated turbocharger. The turbocharger has a Titanium compression wheel for increased turbo life and reliability. This wheel spins at extreme speeds, especially in high altitudes. The Titanium compression wheel can withstand these high-spin conditions with much better wear characteristics. |
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Fuel Delivery
One of the breakthroughs of ACERT Technology is the concept of multiple injection fuel delivery. This process involves a high degree of precision as the combustion process grows in complexity with changing engine speeds and load demands. One key benefit of multiple injection technology is lower combustion chamber temperatures that in turn generate fewer emissions. In precisely shaping the combustion cycle, Caterpillar is also optimizing fuel combustion, further reducing emissions output while giving customers more work for their fuel expense. |
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Electronic Control
Caterpillar has been electronically controlling its engines since the middle 1980s. The culmination of this pioneering spirit is the ADEM™ A4 controller that precisely manages all engine systems. It is a 32-bit computer that uses sensors throughout the engine to regulate fuel delivery, valve timing and all other engine systems that require input, to manage load and performance. The ADEM™A4 controller is the muscle behind engine responsiveness, self-diagnosis, fuel economy and emissions. Software offers flexibility in fuel mapping, allowing the engine to respond to specific application needs as well as weather and altitude conditions. |
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Air Management
Engines need clean, cool air in order to perform, and as such, air management is key to optimizing engine performance and controlling emissions. A new cross flow design in the cylinder head facilitates air movement, while tighter tolerances between the piston and cylinder liner reduces blow-by gases.
The combination of the above three building blocks of ACERT™ Technology provides precise control of the combustion process. |
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 | | Power Management
Variable Horsepower (VHP) automatically delivers an additional five horsepower in each forward gear 1st through 4th, and each reverse gear 1st through 3rd. This standard feature optimizes rimpull for all gears by balancing traction, speed and horsepower while conserving fuel. The system limits horsepower in lower gears, which helps reduce wheel slip where traction is limited. With the Variable Horsepower Plus (VHP Plus) option, an additional five horsepower is delivered in each forward gear 5th through 8th for more power at higher speeds. |
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 | | Performance
The Cat C6.6 engine helps the 120M increase productivity by:
· delivering a 1000 rpm working range
· 3048 m (10,000 ft) altitude capability before engine deration
· high engine torque
· proper horsepower-to-operating weight ratio
Its superior torque and lugging capability can pull through sudden, short-term increases in loads, maintaining consistent, desirable grading speeds to get the work done faster without downshifting. |
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 | | Hydraulic Demand Fan
The efficient hydraulic demand fan automatically adjusts fan speed to engine cooling requirements. Where additional cooling is not required, the fan will decrease to 550 RPM, in turn reducing required horsepower. This results in lower demand on the engine, putting more horsepower to the ground and improving fuel efficiency. |
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 | | Hydraulics
The electro-hydraulic load-sensing system provides the foundation for advanced machine controls, enabling superior controllability and precise and predictable hydraulic movements, with the reliability you expect from Caterpillar. |
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Cat® XT™ Hose
Caterpillar hose technology allows high pressures for maximum power and reduced downtime. Intelligent routing minimizes exposure to damage. Hose clips prevent hose rubbing and excessive vibration for lower owning and operating costs. |
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Independent Oil Supply
A separate hydraulic oil supply prevents cross-contamination and provides proper oil cooling, which reduces heat build-up and extends component life. |
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Load Sensing Hydraulics (PPPC)
The time proven load-sensing system and the advanced Proportional Priority Pressure-Compensating (PPPC, or “triple-PC”) electro-hydraulic valves on the 120M are designed to provide superior implement control and enhanced machine performance in all applications. Continuous matching of hydraulic flow and pressure to power demands creates less heat and reduces power consumption. |
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| | Consistent and Predictable Movement
The electro-hydraulic system uses valves that provide Proportional Priority Pressure Compensated control for precise implement and machine operation. These valves contain spools that are specifically cut for each hydraulic function on the motor grader. They compensate for differences in flow requirements, based on cylinder size and the difference in surface volume between the rod end and barrel end of the cylinder. The result is predictable, consistent hydraulic speeds whether extending or retracting the cylinder. |
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Balanced Flow
Hydraulic flow is proportioned to ensure all implements operate simultaneously with little effect on the engine or implement speeds. If demand exceeds pump capacity, all cylinder velocities are reduced by the same ratio. The result is improved productivity in all applications. |
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 | | Advanced Electro-Hydraulic System
The 120M incorporates a state-of-the-art electro-hydraulic system. This technology is the foundation for revolutionary changes of the machine and implement controls. Advanced joystick controls provide unmatched controllability with precise, predictable hydraulic movements and the reliability customers expect from Caterpillar. |
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Blade Float
Blade float is built into the blade lift control valves and is optional for some auxiliary hydraulic functions. The blade float feature allows the blade to move freely under its own weight. By floating both cylinders, the blade can follow the contours of the road when removing snow. Floating only one cylinder permits the toe of the blade to follow a hard surface while the operator controls the slope with the other lift cylinder. |
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 | | Integrated Electronic Solutions
Full systems integration with advanced electronics including Cat® Messenger, AccuGrade™ blade control system and Cat ET, create a “Smart Machine” that optimizes performance and availability. |
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| | “Smart Machine”
The 120M fully integrates all core systems creating a “Smart Machine.” The Cat data link shares key data among systems, optimizing machine performance while preventing potential machine damage. The Cat Data Link acts as a “spinal cord,” connecting the entire machine so necessary components can “talk” to each other. |
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Electronic Technician (Cat ET)
Cat ET is a two-way communication tool that gives service technicians easy access to stored diagnostic data and lets them configure the machine parameters through the Cat Data Link. This integrated feature reduces machine downtime and lowers operating costs.
Cat ET can perform tasks such as:
· Retrieve engine totals for fuel used, distance travelled, and hours operated
· Display status of all parameters, such as engine speed, throttle position, timing advance, fuel flow, etc.
· View active and logged diagnostic codes to identify faulted components
· Display active and logged event codes to show engine overspeeds, high temperatures, etc.
· View ECMs' current configuration and change user settings
· Perform diagnostic tests and calibrations, and calibrate electro-mechanical and electro-hydraulic components
· Lead operator through every task Cat ET can perform with context-sensitive 'help' file
· Allows Data Logger and Data Log Viewer to record ECM signals for delayed troubleshooting capability.
· Select allowable maximum speed |
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Diagnostics
Cat Messenger, combined with full systems integration, enhances the diagnostic capability of the 120M. Machine system errors are displayed in text as well as with fault codes, allowing service technicians and operators to quickly analyze critical machine data, thereby increasing machine availability. |
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Machine Security System (MSS)
The optional MSS uses electronically coded keys to limit usage by specific individuals or times of the day. MSS deters theft, vandalism and unauthorized use.
Each MSS key contains a unique identification number. The machine electronic control module (ECM) checks the key being inserted against a pre-approved list of keys the customer has authorized. If the key is on the list, the machine will start.
MSS has the following programmable features that allow customers to manage access to their machines:
· Limits operators to selected machines
· Controls the days and hours equipment may be started, which can guard against unauthorized ‘weekend use’ of equipment
· Controls access by untrained operators or unauthorized personnel, reducing injury risk
· Programmable for active and inactive periods, such as disarming the system during regular work hours when a standard key can be used, and then reverting to a security key after hours
· Programmable so a key will expire on a certain date and will no longer start the machine |
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Product Link
The optional Product Link system streamlines diagnostic efforts, and reduces downtime, maintenance scheduling and costs by providing a communication flow of vital machine data and location.
Product Link’s key features and benefits include:
· Service hour meter updates - eliminate trips/calls for SMU readings and allow for effective maintenance scheduling.
· Equipment location - allows for efficient use of sales/service functions and reducing transportation related costs
· Integration with Internet or optional PC mapping software (such as Street Atlas or Map Point) allows for the viewing of machine locations.
· “Product Watch” monitoring provides the capability to protect assets against use at unauthorized times and locations.
· E-mail/pager alerts notify a designated person when machine events activate Product Watch or Digital Signal alarms. |
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 | | Cat Messenger
Cat Messenger provides real-time machine performance and diagnostic data. The operator can quickly view warnings and critical performance and operating information in multiple languages, in addition to those shown on the gauge cluster in the dash. The operator is able to toggle through the menus to view system data and set machine parameters.
Cat Messenger will also show machine faults or warnings in text for easy understanding, so service and operator personnel can accurately diagnose and repair or service the machine.
Some additional Cat Messenger functions include:
· Vehicle trip information
· Dimmable backlight for Messenger, dash cluster and rocker switches
· Multiple language capabilities
· Text codes
· Real-time information
· Trip totals: total fuel used and service hours
· Lifetime totals: forward distance traveled, reverse distance traveled, total fuel used, and service hours
· Oil selection for optimized shift performance
· Autoshift gear parameters |
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Low Battery Elevated Idle
After the 120M is at low idle for an extended period and low system voltage is detected, idle speed is raised. This ensures adequate system voltage and improves battery reliability. |
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Automatic Engine Deration
Protects the C6.6 engine by automatically lowering engine torque output and alerting the operator if it detects:
· high altitude
· high coolant temperature
· high inlet air temperature
· low engine oil pressure
· high turbocharger boost pressure |
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Optional Automatic Blade Control
The Caterpillar AccuGrade System is designed and integrated into the machine and hydraulic systems to create an automatic blade control system that allows operators to grade with complete accuracy. The system uses intelligent, machine-mounted sensors to calculate precise blade slope and elevation information.
Automatic blade control allows operators to improve efficiency and productivity by achieving grade faster and in fewer passes than ever before, reducing the need for traditional survey stakes or grade checkers. |
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AccuGrade Attachment Ready Option
The AccuGrade System is fully integrated into the machine design, making installation quick and easy. Integral hydraulic and electrical components are standard on the 120M (Grade Control Ready). These components include:
· Cab Harness
· Electro-hydraulic valves
· ECM
· Circle bracket and mounting bosses on the drawbar, frame, and cab
This integral design gives you the flexibility to have the optional ARO kit from the factory or a dealer-installed kit which includes:
· Electrical components:
- Front frame harness
- Power module
- Switch pods
- Cross slope harnesses
· Brackets:
- Bolt on blade brackets
- Mainfall bracket
- Knuckle brackets
This optional kit allows easy installation of the Cross Slope, Sonic, Laser, GPS or ATS electronics kits. |
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 | | All-Wheel Drive, Work Tools and Attachments
The Work Tools and optional attachments for the 120M, including the industry leading All Wheel Drive system, expand machine versatility, utilization and performance. |
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Rear Ripper/Scarifier
The 120M optional ripper is made to penetrate tough material fast and rip thoroughly for easier material movement with the moldboard. The ripper includes three shanks with the ability to add two more. |
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Front Mounted Groups
A front mounted push plate/counterweight or front lift group can be ordered on the 120M. The Caterpillar Work Tools front lift group can be combined with a front dozer blade or front scarifier for added versatility. All 120H front-mount attachments will fit the 120M. |
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Ground Engaging Tools (GET)
A wide variety of Caterpillar GET is available on the 120M, including cutting edges, graderbits and end bits, all designed for maximum service life and productivity.
Caterpillar Motor Grader Cutting Edges are made of DH-2 alloy steel, SAE specification high carbon steel, or Tungsten Carbide, and are double bevel shaped for improved penetration. DH-2 Thru-Hardened Edges are heat treated for longer wear life and greater breakage resistance than surface hardened edges or high carbon steel edges. High Carbon Edges are wear resistant and intended for light duty applications. Tungsten Carbide Edges provide up to twenty times more wear life in low impact, high wear applications.
The Caterpillar Graderbits System is a road maintenance edge that lowers owning and operating costs by increasing productivity, decreasing blade maintenance, and reducing downtime. The Caterpillar GraderBit System works by using special adapters and graderbits instead of a conventional cutting edge. The adapters are bolted onto the moldboard, and then the graderbits are secured within the adapter using snap rings. Different combinations of graderbit sizes and types allow you to customize the edge pattern to deliver the best performance for any surface condition. Typical applications include mining haul roads, public roads, farm roads, logging roads, and even paved roads.
Moldboard endbits are designed to protect the end of the moldboard from wear and damage, and are for use in all applications. |
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Automatic Lubrication System
The optional Lincoln Automatic Lubrication System maintains the proper grease lubrication on working surfaces with the Lincoln SLV injector, significantly extending component life. The operator is able to select the timing interval and the amount of lubricant dispensed in each area. Contaminants are purged from open pins and bushings to help prevent dirt from damaging critical components.
Motor graders with AutoLube Systems installed have higher resale value. Other benefits of the automatic lubrication system include increased productivity, reduction in warranty costs, improved safety, and a cleaner environment. |
|
 | | Air Compressor
An optional 145 PSI air compressor is available, giving customers a convenient on-board air system to blow debris off the machine and operate power tools. The air compressor is located on the left hand side of the engine, and the air tank is located in the right side service center. A quick coupler is provided on the tank. |
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Rear Ripper
The 120M optional ripper is made to penetrate tough material fast and rip thoroughly for easier material movement with the moldboard. The ripper includes three shanks with the ability to add two more if needed. |
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 | | Fast-Fill Fuel Option
At a rate that exceeds 378 L (100 gal) per minute, the optional Fast-Fill will allow customers to refuel in less than two minutes. The Fast-Fill is a non-pressurizing system that includes a shutoff that automatically senses fuel level to help prevent spills. |
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All Wheel Drive (AWD) System
The optional AWD system utilizes dedicated left and right pumps for precise hydraulic control. The infinitely variable pumps and motors maximize torque in each gear delivering the most power to the ground in the industry and increasing productivity in the most demanding applications. |
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 | | AWD - Hydrostatic Mode
Standard with AWD, this mode disengages the transmission and provides hydraulic power to the front wheels only. The ground speed is infinitely variable between 0-8 km/h (0-5 mph), perfect for precise finish work. |
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 | | AWD - Steering Compensation
The Caterpillar exclusive Steering Compensation System is standard with All Wheel Drive. This feature enables a "powered turn" by adjusting the outside front tire speed up to 50% faster than the inside tire. The result is improved control, less damage to surfaces and a dramatic reduction of turning radius in poor underfoot conditions. |
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AWD - Constant Net Power
When equipped with AWD, the 120M will automatically increase the gross power up to 26 kW (35 hp) when the system is engaged. |
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 | | Moldboard Options
A 3.7 m (12 ft) moldboard is standard on the 120M, with an optional 4.3 m (14 ft) moldboard available from the factory. Left and right side moldboard extensions are also available, increasing versatility. |
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 | | Snow Removal Work Tools
Caterpillar Work Tools offer a variety of snow removal equipment specifically for the 120M. Multiple snow plow, snow wing and mounting options are available, adding additional machine versatility and utilization throughout the year. An optional mounting group, recommended for all types and brands of snow wings, is installed at the factory. A snow wing kit is available from Cat Work Tools, as well as an H-to-M-Series adapter kit. |
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 | | Safety
Caterpillar has been and continues to be proactive in developing machines that meet or exceed safety standards. |
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Operator Presence System
The Operator Presence System keeps the parking brake engaged and hydraulic implements disabled until the operator is present and the machine is ready for safe operation.
'Present' is defined as:
· the operator is seated
· transmission output speed is greater than zero
· the inching pedal is depressed more than 90%
· the transmission is not in Neutral
The parking brake will engage automatically if the operator is not present.
'Not present' is defined as:
· the operator leaves the seat
· transmission output speed is zero
· the inching pedal is not depressed
· the transmission is in Neutral
This feature will help reduce operator injury and protect surrounding equipment. |
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Secondary Steering System
The standard secondary steering system automatically engages an electric hydraulic pump in case of a drop in steering pressure, allowing the operator to steer the machine to a stop. |
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Speed Sensitive Steering
The steering software automatically provides an infinitely variable ratio between the joystick and the steer tires, resulting in less sensitive steering as the ground speed increases. |
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Low Sound and Vibration Levels
Isolation mounts for the cab, engine and transmission maximize operator comfort and help to minimize sound and vibration. These modifications provide a quieter and more comfortable working environment, optimizing operator focus. |
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Hydraulic Lockout
A simple switch located in the cab disables all implement functions while still providing machine steering control. This safety feature is especially useful while the machine is roading. |
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Brake Systems
Brakes are located at each tandem wheel to eliminate braking loads on the power train. In addition, the brake systems are redundant and utilize accumulators to enable stopping in case of machine failure, further increasing operational safety. |
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Circle Drive Slip Clutch
This standard feature protects the drawbar, circle, moldboard and circle drive from shock loads when the blade encounters an immovable object. The clutch allows the circle pinion to be disengaged from the drive motor, protecting components. It also reduces the possibility of the grader making abrupt directional changes in poor traction conditions, protecting the operator, machine and surroundings. |
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 | | Steel Tandem Walkways
Perforated raised steel walkways cover the tandems. This provides a sturdy platform for standing and walking, and additional protection for the brake lines. Grab rails on the top of engine and rear enclosures provide additional safety when using the walkways. |
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ROPS/FOPS Cab
Isolation mounted to the frame to reduce vibration and sound, the integral ROPS/FOPS structure meets ISO and SAE criteria for operator protection. |
|
 | | Blade Lift Accumulators
Blade lift accumulators absorb vertical shocks and prevent damage to the drawbar, circle and moldboard when the moldboard contacts immovable objects. This option is especially useful in rough grading and rocky areas. Blade lift accumulators reduce unnecessary wear and help to avoid unintended machine movement for increased operator safety. |
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Drop-Down Rear Lights
Optional drop-down lights fold out from the rear of the machine. This creates a wider, lower profile to be better aligned with passenger cars. |
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 | | Rearview Camera
Visibility is further enhanced with an optional Work Area Vision System (WAVS), a closed circuit camera that provides visibility to the rear of the machine through a 178 mm (7 in) LCD color monitor in the cab. While not intended to be used in place of direct views or installed mirrors, WAVS is a great tool to help improve job site safety.
Developed specifically for rugged applications and environments, the Caterpillar Work Area Vision System is factory installed and is easy to use, offering powerful capabilities and features. This durable camera improves productivity and increases operator awareness of surroundings, work tool activity and changing work area conditions.
Mounted on top of the engine enclosure at the rear of the machine, the robust design of the rear view camera can withstand vibration and pressure washing. |
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High Intensity Discharge (HID) Lighting
The standard 65 watt halogen lamps can be replaced with 35 watt HID lights. The powerful HID lights are four times brighter, improving night time visibility and safety. |
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 | | Electrical Disconnect Switch
A battery disconnect switch, located inside the left rear enclosure, provides ground-level lockout of the electrical system. The disconnect is lockable, helping to prevent inadvertent starting of the machine. |
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Engine Shutoff Switch
A secondary engine shutoff switch is located at ground level on the left rear of the machine. This switch cuts fuel supply to the engine while still supplying electrical power, allowing anyone nearby to shut down the machine in case of an emergency. |
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Fenders
To help reduce objects flying from the tires, as well as build-up of mud, snow and debris, optional fenders can be added. |
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Additional Safety Features
The 120M has many additional safety features.
· Laminated glass on the front windows and doors helps prevent glass shattering close to the operator.
· Standard back-up light and alarm provide visual and audible indication of machine direction.
· Black glare-reducing paint on the front frame and engine enclosure decreases glare from other equipment lights and reflection from the sun and snow.
· Lockable doors reduce theft and vandalism.
· Grab rails are conveniently located for added safety around the machine. |
|
 | | Serviceability and Customer Support
Fast component replacement and minimum downtime are possible with Caterpillar's exceptional parts availability and dealers' advanced rebuild and repair capabilities. |
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Grouped Service Points
Operators are more likely to perform daily inspections when they can do it with ease. The 120M groups daily service points in the left side service center to help ensure proper maintenance and inspection routines.
The 120M has been designed with ease and simplicity of service in mind.
· Hinged left and right side engine doors with mechanical stops provide easy access to service points
· Left side engine access door provides access to the following: the circuit breakers, coolant tank, engine air filters, engine crankcase breather, engine oil filler and filter, engine oil dipstick, engine oil sampling valve, ether cylinder (optional), primary fuel filter and water separator, secondary fuel filter, transmission breather, transmission oil filler tube & dipstick, air compressor (optional)
· Left side access door provides easy access to the battery disconnect switch, hydraulic tank return filter and hydraulic tank sight gauge.
· Right side engine access door provides easy access to the coolant sampling valve, water temperature regulator, and HVAC compressor (optional)
· Right side bolted access cover contains the batteries, air tank (optional) and HVAC condenser
· Standard steel tandem walkways provide a sturdy platform for walking and standing, making inspection and maintenance routines easier. |
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Extended Service Intervals
The 120M extended service intervals include 500-hour engine oil changes, 1000-hour transmission & differential oil changes, 4000-hour hydraulic system oil changes, and 12,000-hour cooling system coolant changes. These reduce machine service time and increase availability. |
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 | | Ecology Drains
Ecology drains shorten service times and provide an environmentally safer method to drain fluids. These are conveniently placed at the lower rear of the machine and are included on the engine oil, cooling system coolant, transmission/differential oil and hydraulic oil. |
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Diagnostics and Monitoring
Caterpillar customers using the S•O•SSM analysis can minimize their owning and operating costs. Basic machine information, along with oil samples (engine oil, hydraulic oil, transmission/differential oil) and coolant samples are drawn from S•O•SSM Sampling ports. The dealer uses the data to provide the customer with recommendations for equipment management and preventative maintenance. |
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Machine Selection
Make detailed comparisons of the machines under consideration before purchase. What are the job requirements? What production is needed? What is the true cost of lost production? Dealers and customers should discuss these matters together so that the right machine is built to suit specific needs. Additional information reviewing the full range of features and options is available at www.cat.com. |
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Purchase
Look at the total package. Consider the financing options available, as well as day-to-day operating costs. Dealer support services can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run. |
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Maintenance Services
Equipment buyers are now more often planning for effective maintenance before buying the machine. Caterpillar dealers have a wide range of maintenance services that can be selected when equipment is purchased. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling, S•O•SSM analysis, Coolant Sampling and Technical Analysis help avoid unscheduled repairs. |
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 | | Product Support
Cat dealers believe superior products deserve superior support. When Cat products reach the field, they are supported by a worldwide network of parts distribution facilities, dealer service centers, and technical training facilities to keep the equipment up and running. Cat customers can rely on prompt, dependable parts availability and expertise through the global dealer network, ready to meet demands 24/7. Cat customers can save money with genuine Cat Reman parts. Customers receive the same warranty and reliability as the new products at substantial cost savings. |
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