Caterpillar Forty

Last Updated: July 2024

Overview

The Caterpillar Forty tractor is a robust and versatile machine. Powered by a 4-cylinder Caterpillar gasoline engine, this tractor boasts a displacement of 485.3 cubic inches and liquid-cooling capabilities. The engine has a bore of 5.125 inches and a stroke of 6.5 inches, with a rated RPM of 850. This model sports a gear transmission system, providing 4 forward gears and 1 reverse gear. The Forty model has a width of 16 inches and an operating weight of 13,625 lbs. Additional features include a centrifugal governor, a belt pulley (12.5" diameter, 8.25" face), Ensign Model K-5 carburetor, Eisenmann Model C-T-4 magneto, Donaldson combination air cleaner, and pressure lubrication system. In Nebraska Tractor Tests, it demonstrated a maximum power of 48.57 HP at 850 rpm and a maximum drawbar power of 41.78 HP.

Key Specifications

Transmission: Gear

Operating Weight: 13625

Fuel Type: Gasoline

Image Gallery

Caterpillar Forty Tractor

Technical Specifications

Engine

Manufacturer: Caterpillar
Model: -
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: Gasoline
Induction Type: -
Cylinders: 4
Displacement (ci): 485.3
Bore (in): 5.125
Stroke (in): 6.5
Rated RPM: 850
Power Output (hp): -

Transmission

Type: Gear
Forward Gears: 4
Reverse Gears: 1
Total Gears: -

Dimensions

Length (in): -
Width (in): 16
Height (in): -
Operating Weight (lb): 13625

Power Take-Off (PTO)

PTO Type: -
PTO Speed 1 (rpm): -
PTO Speed 2 (rpm): -
PTO Speed 3 (rpm): -

Miscellaneous

Chassis: -
Drive Type: -
Steering Type: -
Coolant Capacity (qts): -
Front Tire Diameter (in): -
Front Tire Width (in): -
Rear Tire Diameter (in): -
Rear Tire Width (in): -
Front/Rear Rim Diameter (in): -
Tire Type: -
Manufacture - End Year: -
Hitch Type: -
Hitch Category: -
Hitch Position: -
Hitch Capacity (lb): -
Operator Station Type: -
Starter Type: -
Brake Type: -
Hydraulic System Type: -

Test Results

Nebraska Tractor Test Laboratory - Test Date: September 16-20, 1935

Maximum Power and Fuel Consumption

Maximum Power: 48.57 HP (36.21 kW) at 850 rpm
Fuel Consumption at Maximum Power: 5.943 Gal/hr (22.49 l/h) with a fuel efficiency of 0.755 lb/hp.hr (0.458 kg/kW.h)
Varying Load Fuel Consumption: Ranged from 0.913 lb/hp.hr to 0.351 lb/hp.hr

Drawbar Performance

Maximum Drawbar Power: 41.78 HP (31.16 kW) with a drawbar pull of 6316 lbs at 2.42 mph
Drawbar Power at Rated Engine Speed (Second Gear): 37.43 HP (27.92 kW) with a drawbar pull of 3086 lbs and a speed of 4.55 mph

Remarks

Highest permissible horsepower ratings as recommended by A.S.A.E. and S.A.E codes: Drawbar 33.14 HP, Belt 43.80 HP
No repairs or adjustments were needed during the test duration.

Engine and Physical Specifications

Engine: 4-cylinder vertical
Displacement: Bore 5 1/8", Stroke 6 1/2"
Rated Engine RPM: 850 rpm
Total Weight as Tested (with operator): 13,625 lbs

Nebraska Tractor Test Lab, "Test 244: Caterpillar Model 40" (1935). Nebraska Tractor Tests. 849. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/849