Allis Chalmers HD21
General tractor information:
	Manufacturer:	Allis Chalmers
	Model:	HD21
	Type:	Farm/Agricultural tractor
	Years produced:	1954 - 1965
	Total built:	-unknown-
	Factory:	Springfield, IL
	Original price:	-unknown-
Tractor power:
	Drawbar (rated):	135 hp [100.7 kW] (147 late)
	Drawbar (max):	147.2 hp [109.8 kW]
Engine:
	Manufacturer:	Allis-Chalmers
	Fuel:	diesel
	Type:	vertical I-head
	Cylinders:	6
	Bore/Stroke:	5.25x6.50 inches [133 x 165 mm]
	Displacement:	844 ci [13.8 L]
	Compression:	13.3:1
	Rated RPMs:	1800
	Cooling:	-unknown-
	Torque:	-unknown-
	Firing order:	-unknown-
Transmission:
	Type:	torque converter
	Forward:	2
	Reverse:	1
Mechanical:
	Chassis:	crawler
	Steering:	-unknown-
	Brakes:	-unknown-
Capacity:
	Fuel:	135 gal [510 L]
	Coolant:	80 qts [75.7 L]
Power Take-off (PTO):
Tires:
	Ag front:	tracks
	Ag rear:	tracks
Dimensions:
	Weight:	44,000 lbs [19958 kg]
	Wheelbase:	-unknown-
	Length:	198 inches [502 cm]
	Width:	-unknown-
	Height:	99 inches [251 cm]
	Ground clearance:	-unknown-
Electrical:
	Volts:	24 (2 12-volt batteries)
Nebraska Tractor Test 550:
	Test Date:	July 1955
	Engine:	-unknown-
	Drawbar (max):	135 hp [100.7 kW]
Nebraska Tractor Test 664:
	Test Date:	September 1958
	Engine:	-unknown-
	Drawbar (max):	147.2 hp [109.8 kW]
HD21 Serial Numbers:
Location: Steering clutch housing or instrument panel
Allis Chalmers HD21 links:
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Last updated on April 25, 2008