Fleet # –
Year – 1974
Make – Caterpillar
Model – 12G
Body Style – Motor Grader
VIN/SN – 61M1789
Odometer Numbers –
Hours – N/A
Engine Make/Model – 3306PC
Cyl – 6
Fuel Type – Diesel
Transmission Name – 6 forward and 6 reverse speeds
Transmission Type – Direct-drive power shift
Single Axle/Dual Axle – Tandem Axle/Single Wheel
Tire Size/Type – 14.00-24
Tire Condition – Fair
Plow Size –
Dump Box Size –
Drivetrain – 6×4
GVWR – Standard Operating Weight (Total): 27,998.8 lbs
Does the unit operate? – Yes
Does the vehicle start? – Yes
Are keys available? – Yes
Ownership Information – Bill of Sale Only (No Title)
Mechanical Condition – Poor
Mechanical Notes – It runs and operates but mechanical poor. bidders are encouraged to inspect
Body Condition – Fair
Body Notes – Solid with average rust and wear, front cab glass cracked, view images
Interior Condition – Poor
Misc Info – Interior is poor to fair for age. Front Scarifier with an 11-tooth front V-type scarifier, Moldboard is a standard 12-foot earthmoving blade type, Circle Diameter: 60.3 inches with full 360-degree rotation.
The following general information is web-sourced and may contain variances from the subject unit:
The 1974 Caterpillar 12G motor grader is a highly durable and classic machine. Representing one of the early production years for the legendary "G-Series," this model revolutionized the market by shifting from old mechanical controls to hydraulic actuators, adding an articulated frame, and placing the cab over the rear frame for better visibility.
The Engine: Cat 3306PC (S/N 3N24729)
The Caterpillar 3306 PC (Pre-Combustion Chamber) engine is a legendary, heavy-duty workhorse. Your exact serial number falls perfectly within the early 3N-series vehicular block matched to early 12G frames.
- Configuration: 10.5-liter (638 cu in), inline 6-cylinder diesel.
- Power Output: Delivers 135 net horsepower at a rated 2200 RPM when installed in the 12G.
- Aspiration: Naturally aspirated or early turbocharged, depending on the exact build, featuring mechanical fuel injection with a pre-combustion chamber design for reliable fuel burn in varying temperatures.
- Bore & Stroke: 4.75 in x 6.0 in (121 mm x 152 mm).
The Transmission
Your missing transmission specification is a Cat-built direct-drive power shift transmission.
- Gears: 6 forward and 6 reverse speeds controlled by a single lever to the right of the operator.
- Performance: Allows a maximum travel speed of roughly 25.5 mph (41 km/h) in both forward and reverse.
- Controls: Includes a foot-operated inching pedal for high-precision, close-quarter maneuvering. It features an automatic lock mechanism preventing movement if started in gear.
Moldboard (Blade Assembly)
The machine comes equipped with a standard 12-foot earthmoving blade built from high-tensile structural steel.
- Dimensions: 12 ft wide x 24.1 in high x 0.9 in thick.
- Max Depth of Cut: 17.8 inches.
- Side Shift Range: Hydraulic side shift moves 26.4 inches to the left and 20.5 inches to the right.
Circle & Blade Linkage
The circle group is hydraulically controlled, enabling complete rotation and aggressive blade angles.
- Diameter: 60.3 inches with full 360-degree rotation.
- Reach Options: Left max reach outside tires is 72.1 inches; right max reach is 73.7 inches.
- Blade Tip Angles: 90 degrees front/rear tilt adjustment for scraping or grading.
Core Features & Attachments
- Front Scarifier: Equipped with an 11-tooth front V-type scarifier used to break up asphalt, hard packed clay, or rocky soils before the blade passes over.
- Tires: Riding on large 14.00-24 heavy-equipment tires, standard for maintaining traction over raw, loose grades.
- Frame Articulation: Features a 50-degree articulation joint allowing tight turn radiuses (approx. 24 feet) while working banks or curves.
- Hydraulic System:
A closed-center, constant-pressure system running a variable displacement piston pump pushing up to 51 gpm.
Terms of Sale:
All sales are final. No refunds will be issued. This item is being sold as is, where is, with no warranty, expressed written or implied. The seller shall not be responsible for the correct description, authenticity, genuineness, or defects herein, and makes no warranty in connection therewith. No allowance or set aside will be made on account of any incorrectness, imperfection, defect or damage. Any descriptions or representations are for identification purposes only and are not to be construed as a warranty of any type. It is the responsibility of the buyer to have thoroughly inspected this item and to have satisfied himself or herself as to the condition and value and to bid based upon that judgment solely. The seller shall and will make every reasonable effort to disclose any known defects associated with this item at the buyer request prior to the close of sale. Seller assumes no responsibility for any repairs regardless of any oral statements about the item. Seller is NOT responsible for providing tools or heavy equipment to aid in removal. Items left on seller premises after this removal deadline will revert back to possession of the seller, with no refund.
