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Caterpillar 120H Motor Grader Specs

The Caterpillar 120H is a motor grader used for road construction, maintenance, and site preparation. It is part of Caterpillar's H-series grader lineup and is commonly configured for grading, ditching, shaping, and fine finish work on highways, municipal roads, and industrial sites. The 120H typically features a front-mounted engine, articulated frame, tandem rear drive, and a centrally positioned moldboard for precise blade control. It is known for balanced maneuverability, operator visibility, and compatibility with a range of grading attachments. The model is widely used in earthmoving fleets, public works operations, and contractor grading applications.


General Specifications

Caterpillar 120H Motor Grader General Specifications specifications
Approx. Ship Wt. 27,483.00 lbs (12,466.00 kg) - Starting 2008
Controls Hyd. - Starting 1995
Displacement 439.00 cu in (7.20 L) - Starting 2006
Displacement [ES] 403.00 cu in (6.60 L) - Starting 1998
Displacement [NA] 403.00 cu in (6.60 L) - Starting 1998
Displacement [Standard] 403.00 cu in (6.60 L) - Starting 1998
Electrical - Std. Alternator 50 amp - Starting 2006
Electrical - Std. Alternator [ES] 50 A - Starting 1998
Electrical - Std. Alternator [NA] 35 A - Starting 1998
Electrical - Std. Alternator [Standard] 35 A - Starting 1998
Electrical - Std. Battery CCA @ 0° F 750 - Starting 2006
Electrical - Std. Battery CCA @ 0° F [ES] 950 A - Starting 1998
Electrical - Std. Battery CCA @ 0° F [NA] 750 A - Starting 1998
Electrical - Std. Battery CCA @ 0° F [Standard] 750 A - Starting 1998
Electrical - System Size 24V - Starting 2001
Electrical - System Size [ES] 24 V - Starting 1998
Electrical - System Size [NA] 24 V - Starting 1998
Electrical - System Size [Standard] 24 V - Starting 1998
Engine Model 3126B - Starting 2006
Engine Model [ES] 3116 DITA - Starting 1998
Engine Model [NA] 3116 DIT - Starting 1998
Engine Model [Standard] 3116 DITA - Starting 1998
Front Axle/Steering - Articulation Angle 20 deg - Starting 2001
Front Axle/Steering - Articulation Angle [ES] 20 deg - Starting 1998
Front Axle/Steering - Articulation Angle [NA] 20 deg - Starting 1998
Front Axle/Steering - Articulation Angle [Standard] 20 deg - Starting 1998
Front Axle/Steering - Minimum Turning Radius 288.00 in (7.30 m) - Starting 2006
Front Axle/Steering - Minimum Turning Radius [ES] 284.00 in (7.20 m) - Starting 1998
Front Axle/Steering - Minimum Turning Radius [NA] 284.00 in (7.20 m) - Starting 1998
Front Axle/Steering - Minimum Turning Radius [Standard] 284.00 in (7.20 m) - Starting 1998
Front Axle/Steering - Oscillation Angle 32 deg - Starting 2001
Front Axle/Steering - Oscillation Angle [ES] 32 deg - Starting 1998
Front Axle/Steering - Oscillation Angle [NA] 32 deg - Starting 1998
Front Axle/Steering - Oscillation Angle [Standard] 32 deg - Starting 1998
Front Axle/Steering - Steering Angle 50 deg - Starting 2001
Front Axle/Steering - Steering Angle [ES] 50 deg - Starting 1998
Front Axle/Steering - Steering Angle [NA] 50 deg - Starting 1998
Front Axle/Steering - Steering Angle [Standard] 50 deg - Starting 1998
Front Axle/Steering - Wheel Lean Angle 18 deg - Starting 2001
Front Axle/Steering - Wheel Lean Angle [ES] 18 deg - Starting 1998
Front Axle/Steering - Wheel Lean Angle [NA] 18 deg - Starting 1998
Front Axle/Steering - Wheel Lean Angle [Standard] 18 deg - Starting 1998
Front Frame Section Modulus - Max. 225.00 cu in (3,681.00 cu cm) - Starting 2001
Front Frame Section Modulus - Max. [ES] 225.00 cu in (3,681.00 cu cm) - Starting 1998
Front Frame Section Modulus - Max. [NA] 225.00 cu in (3,681.00 cu cm) - Starting 1998
Front Frame Section Modulus - Max. [Standard] 225.00 cu in (3,681.00 cu cm) - Starting 1998
Front Frame Section Modulus - Min. 99.00 cu in (1,619.00 cu cm) - Starting 2001
Front Frame Section Modulus - Min. [ES] 99.00 cu in (1,619.00 cu cm) - Starting 1998
Front Frame Section Modulus - Min. [NA] 99.00 cu in (1,619.00 cu cm) - Starting 1998
Front Frame Section Modulus - Min. [Standard] 99.00 cu in (1,619.00 cu cm) - Starting 1998
Fuel Tank Capacity 90.00 US gal (340.00 L) - Starting 2006
Fuel Tank Capacity [ES] 75.00 US gal (284.00 L) - Starting 1998
Fuel Tank Capacity [NA] 75.00 US gal (284.00 L) - Starting 1998
Fuel Tank Capacity [Standard] 75.00 US gal (284.00 L) - Starting 1998
GENERAL DIMENSIONS - Blade Base 102.00 in (2.60 m) - Starting 2001
GENERAL DIMENSIONS - Blade Base [ES] 102.00 in (2.60 m) - Starting 1998
GENERAL DIMENSIONS - Blade Base [NA] 102.00 in (2.60 m) - Starting 1998
GENERAL DIMENSIONS - Blade Base [Standard] 102.00 in (2.60 m) - Starting 1998
GENERAL DIMENSIONS - Height (stripped top) 115.00 in (2.91 m) - Starting 2001
GENERAL DIMENSIONS - Height (stripped top) [ES] 115.00 in (2.91 m) - Starting 1998
GENERAL DIMENSIONS - Height (stripped top) [NA] 115.00 in (2.91 m) - Starting 1998
GENERAL DIMENSIONS - Height (stripped top) [Standard] 115.00 in (2.91 m) - Starting 1998
GENERAL DIMENSIONS - Height (to top of ROPS) 122.00 in (3.11 m) - Starting 2001
GENERAL DIMENSIONS - Height (to top of ROPS) [ES] 122.00 in (3.11 m) - Starting 1998
GENERAL DIMENSIONS - Height (to top of ROPS) [NA] 122.00 in (3.11 m) - Starting 1998
GENERAL DIMENSIONS - Height (to top of ROPS) [Standard] 122.00 in (3.11 m) - Starting 1998
GENERAL DIMENSIONS - Lift Above Ground 18.00 in (457.00 mm) - Starting 2001
GENERAL DIMENSIONS - Lift Above Ground [ES] 16.10 in (410.00 mm) - Starting 1998
GENERAL DIMENSIONS - Lift Above Ground [NA] 16.10 in (410.00 mm) - Starting 1998
GENERAL DIMENSIONS - Lift Above Ground [Standard] 16.10 in (410.00 mm) - Starting 1998
GENERAL DIMENSIONS - Overall Length 327.00 in (8.31 m) - Starting 2006
GENERAL DIMENSIONS - Overall Length With Pushplate [NA] 334.00 in (8.50 m) - Starting 1998
GENERAL DIMENSIONS - Overall Length With Ripper & Pushplate [ES] 384.00 in (9.76 m) - Starting 1998
GENERAL DIMENSIONS - Overall Length With Ripper & Pushplate [Standard] 380.00 in (9.64 m) - Starting 1998
GENERAL DIMENSIONS - Overall Length [ES] 325.00 in (8.26 m) - Starting 1998
GENERAL DIMENSIONS - Overall Length [NA] 325.00 in (8.26 m) - Starting 1998
GENERAL DIMENSIONS - Overall Length [Standard] 321.00 in (8.14 m) - Starting 1998
GENERAL DIMENSIONS - Overall Width (at top of front tires) 96.00 in (2.44 m) - Starting 2001
GENERAL DIMENSIONS - Overall Width (at top of front tires) [ES] 96.00 in (2.44 m) - Starting 1998
GENERAL DIMENSIONS - Overall Width (at top of front tires) [NA] 96.00 in (2.44 m) - Starting 1998
GENERAL DIMENSIONS - Overall Width (at top of front tires) [Standard] 96.00 in (2.44 m) - Starting 1998
GENERAL DIMENSIONS - Overall Width - (at top of front tires) 96.00 in (2.44 m) - Starting 2006
GENERAL DIMENSIONS - Standard Blade: Height 24.00 in (610.00 mm) - Starting 2001
GENERAL DIMENSIONS - Standard Blade: Height [ES] 24.00 in (610.00 mm) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Height [NA] 24.00 in (610.00 mm) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Height [Standard] 24.00 in (610.00 mm) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Length 144.00 in (3.66 m) - Starting 2001
GENERAL DIMENSIONS - Standard Blade: Length [ES] 144.00 in (3.66 m) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Length [NA] 144.00 in (3.66 m) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Length [Standard] 144.00 in (3.66 m) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Thickness 0.87 in (22.00 mm) - Starting 2001
GENERAL DIMENSIONS - Standard Blade: Thickness [ES] 0.87 in (22.00 mm) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Thickness [NA] 0.87 in (22.00 mm) - Starting 1998
GENERAL DIMENSIONS - Standard Blade: Thickness [Standard] 0.87 in (22.00 mm) - Starting 1998
GENERAL DIMENSIONS - Wheelbase 233.00 in (5.92 m) - Starting 2006
GENERAL DIMENSIONS - Wheelbase [ES] 231.00 in (5.87 m) - Starting 1998
GENERAL DIMENSIONS - Wheelbase [NA] 231.00 in (5.87 m) - Starting 1998
GENERAL DIMENSIONS - Wheelbase [Standard] 231.00 in (5.87 m) - Starting 1998
GENERAL DIMENSIONS - With Pushplate 336.00 in (8.55 m) - Starting 2006
GENERAL DIMENSIONS - With Ripper & Pushplate 380.00 in (9.64 m) - Starting 2006
Horse- power, Rated 125/140 hp - Starting 1995
Hydraulic System Capacity [ES] 17.70 US gal (68.00 L) - Starting 1998
Hydraulic System Capacity [NA] 17.70 US gal (68.00 L) - Starting 1998
Hydraulic System Capacity [Standard] 16.00 US gal (61.00 L) - Starting 1998
Hydraulics: Pump Type Axial Piston - Starting 2001
Hydraulics: Pump Type [ES] Axial Piston - Starting 1998
Hydraulics: Pump Type [NA] Axial Piston - Starting 1998
Hydraulics: Pump Type [Standard] Axial Piston - Starting 1998
Implement Pressure: Max. 3,500.00 psi (24,150.00 kPa) - Starting 2001
Implement Pressure: Max. [ES] 3,500.00 psi (24,150.00 kPa) - Starting 1998
Implement Pressure: Max. [NA] 3,500.00 psi (24,150.00 kPa) - Starting 1998
Implement Pressure: Max. [Standard] 3,500.00 psi (24,150.00 kPa) - Starting 1998
Implement Pressure: Min. 450.00 psi (3,100.00 kPa) - Starting 2001
Implement Pressure: Min. [ES] 450.00 psi (3,100.00 kPa) - Starting 1998
Implement Pressure: Min. [NA] 450.00 psi (3,100.00 kPa) - Starting 1998
Implement Pressure: Min. [Standard] 450.00 psi (3,100.00 kPa) - Starting 1998
Interior Sound Level (ISO 6394) [ES] 77 dB(A) - Starting 1998
Interior Sound Level (SAE J919) [NA] 75 dB(A) - Starting 1998
Interior Sound Level/ISO 6394 77 dBA - Starting 2001
Interior Sound Level/SAE J919 75 dBA - Starting 2001
Length 321.00 in (8.15 m) - Starting 2008
Max. Pump Flow 39.00 US gpm (148.00 L/min) - Starting 2001
Max. Pump Flow [ES] 39.00 US gpm (148.00 L/min) - Starting 1998
Max. Pump Flow [NA] 39.00 US gpm (148.00 L/min) - Starting 1998
Max. Pump Flow [Standard] 39.00 US gpm (148.00 L/min) - Starting 1998
Max. Shoulder Reach - Articulated Position 112.00 in (2.85 m) - Starting 2006
Max. Shoulder Reach - Frame Straight 75.00 in (1.91 m) - Starting 2006
Max. Shoulder Reach: § - Articulated Position 112.00 in (2.85 m) - Starting 2001
Max. Shoulder Reach: § - Frame Straight 75.00 in (1.91 m) - Starting 2001
Max. Torque Rise 33 % - Starting 2001
Max. Torque Rise [ES] 30 % - Starting 1998
Max. Torque Rise [NA] 30 % - Starting 1998
Max. Torque Rise [Standard] 30 % - Starting 1998
Max.Torque Rise 50 % - Starting 2006
Maximum Forward Speed 26.50 mph (42.60 km/h) - Starting 1995
Maximum Reverse Speed 20.90 mph (33.70 km/h) - Starting 1995
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Articulated Position [ES] 112.00 in (2.85 m) - Starting 1998
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Articulated Position [NA] 112.00 in (2.85 m) - Starting 1998
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Articulated Position [Standard] 109.00 in (2.78 m) - Starting 1998
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Frame Straight [ES] 75.00 in (1.91 m) - Starting 1998
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Frame Straight [NA] 75.00 in (1.91 m) - Starting 1998
Maximum Right Shoulder Reach (standard blade; hydraulic sideshift and tip control) - Frame Straight [Standard] 72.00 in (1.84 m) - Starting 1998
Mold- board Length 144.00 in (3.66 m) - Starting 1995
Net Flywheel Power 125.00 hp (93.00 kW) - Starting 2001
Net Flywheel Power [NA] 125.00 hp (93.00 kW) - Starting 1998
Net Flywheel Power: Gears 1-3 125.00 hp (93.00 kW) - Starting 2006
Net Flywheel Power: Gears 1-3 [ES] 125.00 hp (93.00 kW) - Starting 1998
Net Flywheel Power: Gears 1-3 [Standard] 125.00 hp (93.00 kW) - Starting 1998
Net Flywheel Power: Gears 1-3 ¶ 125.00 hp (93.00 kW) - Starting 2001
Net Flywheel Power: Gears 4-8 140.00 hp (104.00 kW) - Starting 2001
Net Flywheel Power: Gears 4-8 [ES] 140.00 hp (104.00 kW) - Starting 1998
Net Flywheel Power: Gears 4-8 [Standard] 140.00 hp (104.00 kW) - Starting 1998
No. Circle Support Shoes 4 - Starting 2001
No. Circle Support Shoes [ES] 4 - Starting 1998
No. Circle Support Shoes [NA] 4 - Starting 1998
No. Circle Support Shoes [Standard] 4 - Starting 1998
No. of Cylinders 6 - Starting 2001
No. of Cylinders [ES] 6 - Starting 1998
No. of Cylinders [NA] 6 - Starting 1998
No. of Cylinders [Standard] 6 - Starting 1998
No. of Speeds Forward/Reverse 8/6 - Starting 2001
No. of Speeds Forward/Reverse [ES] 8/6 - Starting 1998
No. of Speeds Forward/Reverse [NA] 8/6 - Starting 1998
No. of Speeds Forward/Reverse [Standard] 8/6 - Starting 1998
Operating Weight 27,880.00 lbs (12,650.00 kg) - Starting 2006
Operating Weight [ES] 27,600.00 lbs (12,519.00 kg) - Starting 1998
Operating Weight [NA] 27,600.00 lbs (12,519.00 kg) - Starting 1998
Operating Weight [Standard] 25,040.00 lbs (11,358.00 kg) - Starting 1998
Product Identification Prefix 5FM(BRAZ) - Starting 2008
Rated Engine RPM 2000 rpm - Starting 2001
Rated Engine RPM [ES] 2000 rpm - Starting 1998
Rated Engine RPM [NA] 2000 rpm - Starting 1998
Rated Engine RPM [Standard] 2000 rpm - Starting 1998
Std. Tires - Front & Rear 13.00-24 (10 PR) (G-2 - Starting 2001
Std. Tires - Front & Rear [ES] 13.00-24 (10 PR) (G-2) - Starting 1998
Std. Tires - Front & Rear [NA] 13.00-24 (10 PR) (G-2) - Starting 1998
Std. Tires - Front & Rear [Standard] 13.00-24 (10 PR) (G-2) - Starting 1998
Std.Tires - Front & Rear 13.00-24 (10 PR) (G-2 - Starting 2006
System Capacity 14.00 US gal (53.00 L) - Starting 2006
Top Speed Forward [ES] 26.50 mph (42.60 km/h) - Starting 1998
Top Speed Forward [Standard] 26.50 mph (42.60 km/h) - Starting 1998
Top Speed Reverse [ES] 20.90 mph (33.70 km/h) - Starting 1998
Top Speed Reverse [Standard] 20.90 mph (33.70 km/h) - Starting 1998
Top Speed: Forward 26.50 mph (42.60 km/h) - Starting 2001
Top Speed: Forward [NA] 26.50 mph (42.60 km/h) - Starting 1998
Top Speed: Reverse 20.90 mph (33.70 km/h) - Starting 2001
Top Speed: Reverse [NA] 20.90 mph (33.70 km/h) - Starting 1998
Turning Radius 283.00 in (7.30 m) - Starting 2002
Variable Horsepower: Gears 4-8 140.00 hp (104.00 kW) - Starting 2006
Variable horsepower: Gears 4-8 [NA] 140.00 hp (104.00 kW) - Starting 1998
Variable horsepower: Gears 4-8 ¶ 140.00 hp (104.00 kW) - Starting 2001
Wheel- base 233.00 in (5.92 m) - Starting 2002
Width 96.00 in (2.44 m) - Starting 2008

Circle

Caterpillar 120H Motor Grader Circle specifications
Blade Tip Angle - Front 40 degrees
Blade Tip Angle - Rear 5 degrees
Diameter 60.30 in (153.16 cm)
Max Lift Above Ground 18.00 in (45.72 cm)
Max Reach Outside Tires - Left 72.50 in (184.15 cm)
Max Reach Outside Tires - Right 75.30 in (191.26 cm)
Rotation 360 degrees
Shift Left 24.70 in (62.74 cm)
Shift Right 24.80 in (62.99 cm)

Dimensions

Caterpillar 120H Motor Grader Dimensions specifications
Blade Base 8.54 ft (2.60 m)
Front Ground Clearance 2.00 ft (0.61 m)
Height 10.17 ft (3.10 m)
Height To Top Of Isomount Cab 10.21 ft (3.11 m)
Length 28.08 ft (8.56 m)
Overall Length 27.10 ft (8.26 m)
Tandem Axle Wheelbase 4.96 ft (1.51 m)
Weight 31,410.00 lbs (14,247.35 kg)
Wheelbase 19.26 ft (5.87 m)
Width 8.00 ft (2.44 m)
Width Over Tires 8.01 ft (2.44 m)

Engine

Caterpillar 120H Motor Grader Engine specifications
Aspiration turbocharged
Displacement 402.80 cu in (6,600.72 cu cm)
Engine Make 2236
Engine Model 3116 DITA
Max Power 140.00 hp (104.40 kw)
Net Power Gear 1-2 125.00 hp (93.21 kw)
Net Power Gear 4-6 125.00 hp (93.21 kw)
Net Power Gears 7-8 140.00 hp (104.40 kw)
Number Of Cylinders 6
Power Measured @ 2000 rpm
Torque Measured @ 1400 rpm

Front Axle

Caterpillar 120H Motor Grader Front Axle specifications
Ground Clearance 2.00 ft (0.61 m)
Oscillation - Total 32 degrees
Wheel Lean 18 degrees

Hydraulic System

Caterpillar 120H Motor Grader Hydraulic System specifications
Pump Flow 39.10 gpm (147.99 lpm)
Pump Type Axial Piston
Relief Valve Pressure 3500 psi

Moldboard

Caterpillar 120H Motor Grader Moldboard specifications
Blade Down Pressure 20,062.10 lbs (9,100.03 kg)
Blade Pull At Max Weight 23,503.50 lbs (10,661.02 kg)
Max Depth Of Cut 30.60 in (77.72 cm)
Moldboard Height 24.10 in (61.21 cm)
Moldboard Thickness 0.90 in (2.29 cm)
Moldboard Width 12.10 ft (3.69 m)
Side Shift Left 20.70 in (52.58 cm)
Side Shift Right 26.00 in (66.04 cm)

Operational

Caterpillar 120H Motor Grader Operational specifications
Alternator Supplied Amperage 50 amps
Circle Gearbox Fluid Capacity 1.90 gal (7.19 l)
Cooling System Fluid Capacity 10.60 gal (40.12 l)
Fuel Capacity 75.10 gal (284.25 l)
Hydraulic System Fluid Capacity 18.00 gal (68.13 l)
Oil System Fluid Capacity 6.10 gal (23.09 l)
Operating Voltage 24 V
Rear Diff/Final Drive Fluid Capacity 12.50 gal (47.31 l)
Std Operation Weight - Front Axle 7,880.00 lbs (3,574.31 kg)
Std Operation Weight - Rear Axle 19,720.00 lbs (8,944.85 kg)
Std Operation Weight - Total 27,597.50 lbs (12,518.03 kg)
Tandem Case Fluid Capacity (Each) 13.00 gal (49.21 l)
Tire Size 12-24 10PR (G-2)

Steering

Caterpillar 120H Motor Grader Steering specifications
Articulation Angle 20 degrees
Turning Radius 23.70 ft (7.22 m)

Transmission

Caterpillar 120H Motor Grader Transmission specifications
Max Speed - Forward 26.50 mph (42.65 kph)
Max Speed - Reverse 21.00 mph (33.80 kph)
Number Of Gears - Forward 8
Number Of Gears - Reverse 6
Transmission Type direct drive, powershift
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