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Caterpillar 120H Motor Grader

The 120H blends productivity and durability to give you the best return on your investment. The Cat® 3126B engine, direct-drive power shift transmission and load-sensing hydraulics are perfectly balanced, working together to deliver top productivity in all applications.

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Overview &
Specifications

Features
& Benefits

Standard
Equipment

Optional
Equipment

Work Tools &
Attachments

Engine

Base Power (all gears) Net	125 hp / 93 kW

VHP - gears 1-3 Net	125 hp / 93 kW

VHP - gears 4-8 Net	140 hp / 104 kW

Base Power (all gears) Gross	139 hp / 104 kW

VHP - gears 1-3 Gross	139 hp / 104 kW

VHP - gears 4-8 Gross	154 hp / 115 kW

Engine Model	Cat® 3126B DITA ATAAC VHP

Displacement	439 in3 / 7.2 L

Bore	4.3 in / 110 mm

Stroke	5 in / 127 mm

Speed @ rated power	2000 RPM

Number of cylinders	6

Derating altitude	10000 ft / 3048 m

Std - Fan speed - max	1210 RPM

Std - Fan speed - min	500 RPM

Std - Ambient Capability	117 ° F / 47 ° C

Hi Ambient - Fan speed - max	1300 RPM

Hi Ambient - Fan speed - min	500 RPM

Hi Ambient Capability	122 ° F / 50 ° C

Weights

Gross Vehicle Weight - base	27880 lb / 12650 kg

Gross Vehicle Weight, max	37306 lb / 16922 kg

Gross Vehicle Wt, max - front axle	11190 lb / 5076 kg

Gross Vehicle Wt, max - rear axle	23116 lb / 11846 kg

Gross Vehicle Wt, base - front axle	7959 lb / 3611 kg

Gross Vehicle Wt, base - rear axle	19921 lb / 9039 kg

Moldboard

Blade width	12 ft / 3.658 m

Moldboard - height	24 in / 610 mm

Moldboard - thickness	.87 in / 22 mm

Arc radius	16.25 in / 413 mm

Throat clearance	4.7 in / 120 mm

Cutting edge - width	6 in / 152 mm

Cutting edge - thickness	.63 in / 16 mm

End Bit - width	6 in / 152 mm

End Bit - thickness	.63 in / 16 mm

Blade Pull - base GVW	17816 lb / 8081 kg

Blade Pull - max GVW	23504 lb / 10661 kg

Down Pressure - base GVW	14488 lb / 6574 kg

Down Pressure - max GVW	20056 lb / 9100 kg

Operating Specifications

Top Speed - Fwd.	26.5 mph / 42.6 km/h

Top Speed - Rev.	20.9 mph / 33.7 km/h

Turning radius, outside front tires	23.6 ft / 7.3 m

Steering range - left/right	50°

Articulation angle - left/right	20°

Fwd. 1st	2.3 mph / 3.6 km/h

Fwd. 2nd	3.1 mph / 5 km/h

Fwd. 3rd	4.5 mph / 7.2 km/h

Fwd. 4th	6.2 mph / 9.9 km/h

Fwd. 5th	9.7 mph / 15.7 km/h

Fwd. 6th	13.2 mph / 21.3 km/h

Fwd. 7th	18.2 mph / 29.3 km/h

Fwd. 8th	26.5 mph / 42.6 km/h

Rev. 1st	1.8 mph / 2.9 km/h

Rev. 2nd	3.4 mph / 5.4 km/h

Rev. 3rd	4.9 mph / 7.8 km/h

Rev. 4th	7.7 mph / 12.4 km/h

Rev. 5th	14.4 mph / 23.1 km/h

Rev. 6th	20.9 mph / 33.7 km/h

Service Refill

Fuel Capacity	90 gal / 340 L

Cooling system	10.4 gal / 40 L

Hydraulic system - total	17.7 gal / 68 L

Hydraulic system - tank	9.9 gal / 38 L

Engine Oil	7.8 gal / 29.5 L

Trans./Diff./Final Drives	12.2 gal / 47 L

Tandem housing (each)	12.7 gal / 49 L

Front wheel spindle bearing housing	.13 gal / .5 L

Circle drive housing	1.8 gal / 7 L

Power Train

Forward/Reverse Gears	8 fwd / 6 rev

Transmission	direct drive, power shift

Brakes - Service	air actuated, multiple oil disc

Brakes - Service, surface area	2595 in2 / 16744 cm2

Brakes - Parking	air-actuated, multiple oil-disc

Brakes - Secondary	dual circuit

Hydraulic System

Circuit type	closed center load sense

Pump type	variable piston

Pump output	38 gal/min / 144 L/min

Maximum system pressure	3500 psi / 24150 kPa

Reservoir tank capacity	10.04 gal / 38 L

Standby Pressure	450 psi / 3100 kPa

Frame

Circle - diameter	60.2 in / 1530 mm

Circle - blade beam thickness	1.2 in / 30 mm

Drawbar - height	5 in / 127 mm

Front-top/bottom plate - width	11 in / 280 mm

Front-top/bottom plate - thickness	.9 in / 22 mm

Front-side plates - width	9.3 in / 236 mm

Front-side plates - thickness	.4 in / 10 mm

Front-linear weights - min	90 lb/ft / 134 kg/m

Front-linear weights - max	115 lb/ft / 172 kg/m

Front-section modulus - min	99 in3 / 1619 cm3

Front-section modulus - max	225 in3 / 3681 cm3

Front axle - height to center	23.9 in / 608 mm

Front axle - wheel lean, left/right	18°

Front axle - total oscillation per side	32°

Blade Range

Circle centershift - right	24.7 in / 628 mm

Circle centershift - left	24.6 in / 625 mm

Moldboard sideshift - right	26 in / 660 mm

Moldboard sideshift - left	20.6 in / 524 mm

Maximum blade position angle	90°

Blade tip range - forward	40°

Blade tip range - backward	5°

Maximum shoulder reach outside of tires - right	75.3 in / 1912 mm

Maximum shoulder reach outside of tires - left	72.4 in / 1840 mm

Maximum lift above ground	18 in / 457 mm

Maximum depth of cut	30.5 in / 775 mm

Ripper

Ripping depth, maximum	10.3 in / 262 mm

Ripper shank holders	5

Shank holder spacing - min	21 in / 533 mm

Penetration force	9566 lb / 4343 kg

Pryout force	5020 lb / 2279 kg

Machine length increase, beam raised	41.7 in / 1058 mm

Scarifier

Front, straight: Working width	71 in / 1800 mm

Front, straight: Scarfying depth, maximum	12.5 in / 317 mm

Front, straight: Scarifier shank holders	17

Front, straight: Scarifier shank holder spacing	4.38 in / 111 mm

Tandems

Height	17.2 in / 438 mm

Width	6.8 in / 172 mm

Sidewall thickness - inner	.55 in / 14 mm

Sidewall thickness - outer	.63 in / 16 mm

Drive chain pitch	1.75 in / 44.5 mm

Wheel axle spacing	59.5 in / 1510 mm

Tandem oscillation - front up	15°

Tandem oscillation - front down	25°

Dimensions

Height - top of cab	122 in / 3108 mm

Height - high profile cab	131 in / 3332 mm

Height - no cab	121 in / 3090 mm

Length - counterweight to ripper	396.2 in / 10064 mm

Width - outside front tires	96.1 in / 2441 mm

Length - front axle to mid tandem	233 in / 5923 mm

Length - front tire to rear of machine	327.3 in / 8314 mm

Length - front axle to moldboard	102.2 in / 2596 mm

Length - between tandem axles	59.4 in / 1510 mm

Width - outside rear tires	94.6 in / 2402 mm

Width - tire center lines	80.9 in / 2056 mm

Height - front axle center	23.4 in / 594 mm

Height to exhaust stack	123 in / 3138 mm

Height to top of cylinders	115 in / 2912 mm

Ground clearance at rear axle	13.8 in / 351 mm