Allis Chalmers HD21

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3-Point Hitch
Rear type -
Control -
Rear lift -
Front hitch -
Front lift -
Power Take-off (PTO):
Rear PTO -
Clutch -
Rear RPM -
Front PTO -
Engine RPM -
Capacity
Fuel 135 gal [511.0 L]
Dimensions & Tires
Wheelbase -
Weight 45500 lbs [20638 kg]
Front tire tracks
Rear tire tracks
Allis Chalmers HD21 Power:
Engine gross -
Engine max -
Mechanical
Chassis crawler
Differential lock -
Steering -
Brakes contracting band
Trailer brakes -
Cab Open operator station.
Hydraulics
Type -
Rear valves -
Mid valves -
Pump flow -
SCV flow -
Total flow -
Electrical
Ground -
Charging system -
Charging amps -
Charging volts -
Battery
Number 2
Cold-cranking amps -
Volts 12
Engine Detail
Allis-Chalmers
supercharged diesel
6-cylinder
liquid-cooled vertical I-head
844 ci [13.8 L]
Engine specifications
Bore/Stroke 5.25x6.50 inches [133 x 165 mm]
Emissions -
Emission control -
Rated Power -
Maximum Power -
Air cleaner oil bath
Pre-heating -
Compression -
Fuel system -
Rated RPM 1800
Operating RPM -
Torque -
Torque RPM -
Starter -
Starter volts 24
Oil capacity -
Oil change -
Coolant capacity 80 qts [75.7 L]
Type 1954 - 1965
Gears 2 forward and 1 reverse
Clutch -
Speeds  
Type torque converter
Gears -
Clutch -
Speeds -
Allis Chalmers HD21 Tires
Ag front 1954 - 1965
Ag rear tracks
Standard tires (ag) -
Dimensions
Weight (operating) -
Weight (max capacity) -
Front axle load -
Rear axle load -
Wheelbase -
Length 198 inches [502 cm]
With hitch Length: -
Width -
Height (hood) -
Height (cab) -
Front axle -
Rear axle -
Height (exhaust) -
Clearance (front axle) -
Clearance (rear axle) -
Clearance (drawbar) -
Test name
Test Date 1954 - 1965
Test Type Diesel 2-speed crawler
PTO power (max) -
PTO fuel use (max) -
PTO power (rated engine speed) -
PTO fuel use (engine speed) -
PTO fuel use (PTO speed) -
Drawbar power (max) 135.12 hp [100.8 kW]
Drawbar fuel use (max) -
Drawbar pull (max) 40563 lbs [18399 kg]
Max pull gear Low
Test name
Test Date July 6 - 18, 1955
Test Type -
PTO power (max) -
PTO fuel use (max) -
PTO power (rated engine speed) -
PTO fuel use (engine speed) -
PTO fuel use (PTO speed) -
Drawbar power (max) -
Drawbar fuel use (max) -
Drawbar pull (max) -
Max pull gear -