Caterpillar 120 GC Motor Grader Specs & Buying Research

At a glance

Key specifications

Blade Width12 ft 1.7 in3.7 mCaterpillar 120 GC — Moldboard. Published reference configuration; fitted options can vary.Manufacturer verified

Operating Weight - Typically Equipped31,958 lb14,496 kgCaterpillar 120 GC — Weights. * Typically equipped machine weight is calculated with full fluids, ROPS HVAC CAB, 12' basic blade, push plate, ripper, 14-24 tires on multi-piece rims and operator.Manufacturer verified

Length – Front Axle to Mid Tandem — Non AWD19 ft 1.6 in5,833 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified

Net Power - ISO 9249/SAE J1349171 hp128 kWISO 9249 · Caterpillar 120 GC — Engine. Net power is tested per ISO 9249, SAE J1349, and EEC 80/1269 standards in effect at the time of manufacture. Net power advertised is the power available at rated speed of 2,000 rpm, measured at the flywheel when engine is equipped with fan, air cleaner, muffler, and alternator. Power as declared per ISO 14396.Manufacturer verified

Overall dimensions

Length – Front Tire to Rear of Machine — Non AWD27 ft 11.6 in8,523 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified

Width – Outside Front Tires — Non AWD7 ft 10.6 in2,402 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified

Height – High Profile Top of Cab10 ft 11.8 in3,347 mm120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.Manufacturer verified

Precision visual reference

Dimensions and working range

Published measurements for the stated configuration. Illustration not to scale.

Reviewed visual

Caterpillar 120 GC Motor Grader, illustrative side and front reference views; not a scale drawing. — Machine reference views

Overall Size

ALength – Front Tire to Rear of Machine — Non AWD27 ft 11.6 in8,523 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified

BWidth – Outside Front Tires — Non AWD7 ft 10.6 in2,402 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified

CHeight – High Profile Top of Cab10 ft 11.8 in3,347 mm120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.Manufacturer verified

Working Range

Blade Width12 ft 1.7 in3.7 mCaterpillar 120 GC — Moldboard. Published reference configuration; fitted options can vary.Manufacturer verified

Ground Clearance at Rear Axle1 ft 2.5 in369 mm120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.Manufacturer verified

Reference details

Overall measurement views reviewed 2026-09-06. Illustrative artwork, not a scale drawing.

Documented model generation; confirm serial/PIN and installed configuration · United States / North American reference

Canonical reference: heavyeq.ca/specs/motor-graders/caterpillar/120-gc/ · Printed from HeavyEQ.ca. Confirm the actual machine and current manufacturer documentation before transport or operation.

Year, generation & configuration

Model generation and configuration

Generation / series: Current 120 GC manufacturer record
Applicable region: United States / North American reference
Year handling: Confirm the serial/PIN and production year when matching an individual machine to this reference.

Model identity

Model family, generation & status

Model family: Caterpillar 120 GC
Generation / record: Current 120 GC manufacturer record
Product status: Current manufacturer model — status checked September 2026
Regional scope: United States / North American reference

No verified lineage relationship published. HeavyEQ reviewed first-party sources and did not force a predecessor or successor from model numbering.

United States / North American reference

Verified specifications

Values retain their cited source, verification status and original publication basis. Imperial is presented first while manufacturer-published dual units and configuration context remain attached to every value.

Qualified specifications with value-level verification status
Specification	Imperial	Metric	Standard / configuration	Source
Net Power - ISO 9249/SAE J1349	171 hp	128 kW	ISO 9249 · Caterpillar 120 GC — Engine. Net power is tested per ISO 9249, SAE J1349, and EEC 80/1269 standards in effect at the time of manufacture. Net power advertised is the power available at rated speed of 2,000 rpm, measured at the flywheel when engine is equipped with fan, air cleaner, muffler, and alternator. Power as declared per ISO 14396.Manufacturer verified	Caterpillar
Operating Weight - Typically Equipped	31,958 lb	14,496 kg	Caterpillar 120 GC — Weights. * Typically equipped machine weight is calculated with full fluids, ROPS HVAC CAB, 12' basic blade, push plate, ripper, 14-24 tires on multi-piece rims and operator.Manufacturer verifiedSafety-sensitive value — verify the exact machine.	Caterpillar
Blade Width	12 ft 1.7 in	3.7 m	Caterpillar 120 GC — Moldboard. Published reference configuration; fitted options can vary.Manufacturer verified	Caterpillar
Height – High Profile Top of Cab	10 ft 11.8 in	3,347 mm	120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.Manufacturer verifiedSafety-sensitive value — verify the exact machine.	Caterpillar
Ground Clearance at Rear Axle	1 ft 2.5 in	369 mm	120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.Manufacturer verifiedSafety-sensitive value — verify the exact machine.	Caterpillar
Length – Front Tire to Rear of Machine — Non AWD	27 ft 11.6 in	8,523 mm	120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verifiedSafety-sensitive value — verify the exact machine.	Caterpillar
Width – Outside Front Tires — Non AWD	7 ft 10.6 in	2,402 mm	120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verifiedSafety-sensitive value — verify the exact machine.	Caterpillar
Length – Front Axle to Mid Tandem — Non AWD	19 ft 1.6 in	5,833 mm	120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.Manufacturer verified	Caterpillar

What the specifications mean

The published 120 GC values remain attached to their stated configuration and rating basis.

120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.

An individual machine must be verified by serial/PIN, installed equipment and actual measurements.

Configuration intelligence

Configurations & specification differences

These observations are scoped to the cited generation and region. They are not a list of valid option combinations.

Material configurations in this research record
Record	Verified observation	Scope
Drive & controls	120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.	Current 120 GC manufacturer recordUnited States / North American reference
Moldboard & front equipment	120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.	Current 120 GC manufacturer recordUnited States / North American reference

A brochure configuration is not an individual marketplace machine. Serial/PIN and build information are required for exact verification.

Used 120 GC inspection priorities

Measure circle, drawbar, saddle and moldboard wear through the full range of motion.
Inspect tandem cases, articulation, wheel lean, steering and tire condition.
Verify AWD and grade-control functions only when physically installed and operational.
Match the 120 GC model plate, fitted attachment and undercarriage to the cited reference configuration.

Configuration-aware inspection: these checks are triggered by machine category, installed configuration and technology package. Brochure-listed technology must be physically present, active, licensed and calibrated on the used machine.

Hours, condition and ownership cost

Hours are context, not a condition grade. Duty cycle, idle time, maintenance evidence, wear-system measurements, structural repairs and installed technology should be evaluated together.

Cost drivers to model

Circle and drawbar wear can materially change repair exposure and grading accuracy.
Tires, tandem drive, front axle and hydraulic functions need separate reserves.
Technology packages require hardware, calibration, subscriptions and support checks.

Compatibility graph

Attachment considerations

Relationships below identify relevant classes only unless a stronger evidence state is shown. They never assert exact used-attachment fitment.

relevant attachment class

Rear rippers and winches

Verify rear mounting, hydraulics, tool weight, manufacturer application.

Open attachment research

relevant attachment class

Dozer blades and application implements

Verify blade linkage, machine class, hydraulics, guarding.

Open attachment research

Before confirming fitment

generation and machine configuration
mounting interface, coupler or pin geometry
hydraulic flow, pressure, return and case drain
attachment weight and machine capacity limits
electrical controls or required machine options

Model-reference transport profile

Transport reference

Reference measurements retain their configuration and verification status. Confirm the actual transport setup before booking.

Manufacturer verifiedOperating Weight - Typically Equipped31,958 lb14,496 kgCaterpillar 120 GC — Weights. * Typically equipped machine weight is calculated with full fluids, ROPS HVAC CAB, 12' basic blade, push plate, ripper, 14-24 tires on multi-piece rims and operator.

Manufacturer verifiedHeight – High Profile Top of Cab10 ft 11.8 in3,347 mm120 GC — Dimensions table reference tires; front tire to rear of machine unless push plate/ripper explicitly included. Width over front tires with moldboard angled for travel.

Manufacturer verifiedLength – Front Tire to Rear of Machine — Non AWD27 ft 11.6 in8,523 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.

Manufacturer verifiedWidth – Outside Front Tires — Non AWD7 ft 10.6 in2,402 mm120 GC — non-AWD reference with published tires; moldboard angled for travel, no push plate or ripper in base length.

Reference specifications can differ from the actual configured machine. Confirm dimensions and weight before booking transportation.

Confirm or replace before a transport request

actual weight
actual travel length, width and height
attachments and removable work tools
bucket, blade, carriage or boom position
loading condition

Source provenance

First-party sources and verification notes

Only manufacturer-authored records are linked publicly. Provisional measurements remain marked until a matching first-party record is confirmed.

Caterpillar

120 GC Motor Grader | Cat | Caterpillar

United States / North American reference · exact model technical page · accessed September 6, 2026 · status: Manufacturer verified

Open source