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W 12-20

Cletrac W 12-20

Last Updated: July 2024

Overview

The Cletrac W 12-20 is a crawler track tractor model with a single-gear transmission providing 1 forward and reverse gear. It has a liquid-cooled, 4-cylinder engine made by Cletrac with vertical cylinder orientation and overhead valves. The engine runs on kerosene and has a displacement of 276.5 ci, bore of 4 inches, and stroke of 5.5 inches. The rated engine speed is 1265 RPM. The tractor measures 96 inches in length, 50 inches in width, and 52 inches in height, with an operating weight of 3300 lbs. It has a normal speed of 3.5 mph and a variable speed range of 1 to 4 mph. The Cletrac W 12-20 uses a Kingston carburetor and is claimed to have a fuel efficiency of 0.827 lb/hp.hr for kerosene, using less than 2 gallons per working hour.

Key Specifications

Transmission: Gear

Operating Weight: 3300

Fuel Type: Kerosene

Technical Specifications

Engine

Manufacturer: Cletrac
Model: -
Cooling Type: Liquid-cooled
Cylinder Orientation: -
Valve Configuration: -
Fuel Type: Kerosene
Induction Type: -
Cylinders: 4
Displacement (ci): 276.5
Bore (in): 4
Stroke (in): 5.5
Rated RPM: 1265
Power Output (hp): -

Transmission

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

Dimensions

Length (in): 96
Width (in): 50
Height (in): 52
Operating Weight (lb): 3300

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: July 29 to August 3, 1920

Maximum Power and Fuel Consumption

Maximum Power: 15.52 HP at 1335 RPM
Fuel Consumption at Maximum Power: Not Recorded
Fuel Efficiency: 0.827 lb/hp.hr for kerosene

Belt Pulley Performance

Rated Load Test: 13.47 HP at 1395 RPM with a fuel consumption of 4.39 gallons/hr
Maximum Load Test: 15.52 HP at 1335 RPM with a fuel consumption of 5.36 gallons/hr

Drawbar Performance

Drawbar Power at Rated Engine Speed: 12.84 HP with a drawbar pull of 2527 lbs
Fuel Consumption at Rated Speed: 0.530 lb/hp.hr for kerosene

Oil Consumption

Total Oil Consumed: 5.5 gallons for the engine and 1 gallon for the transmission during the complete test of approximately 30 hours.

General Remarks

The tractor climbed a 25° incline easily and was tested in muddy, heavy load conditions. Minor repairs, including a broken fuel pipe and non-registering oil gauge, were noted but deemed insignificant for the tractor’s qualification.

NTTL.(1920).Nebraska Tractor Test 045 for Cletrac Model W 12-20. Lincoln, NE: Nebraska Tractor Test Laboratory. Retrieved from https://digitalcommons.unl.edu/tractormuseumlit/662