The D21 was the first Allis Chalmers tractor to have over 100 horsepower. The upgraded D21 II began at serial number 2201 in 1965.
Manufacturer
Allis Chalmers
Total Built
1,129
Hitch
Rear Type
III/II
Pto
Rear Pto
independent
Rear Type
1000
Electrical
Ground
negative
Charging System
Delco-Remy generator
Charging Amps
32
Batteries
2
Batteries
4 OptOptional
Battery Volts
12
Battery Ah
95
Mechanical
Two-wheel drive
Power steering
Band actuated disc brakes
Open operator station.
D21 / 02
Under the hood
Engine Detail
Allis Chalmers 3400
diesel
6-cylinder
liquid-cooled
Displacement
426 ci7.0 L
Bore Stroke
4.25x5.00 inches108 x 127 mm
Power
119 hp88.7 kW
Air Cleaner
dry
Compression Ratio
16.0:1
Rated Rpm
2200
Firing Order
1-5-3-6-2-4
Coolant Capacity
21 qts19.9 L
Intake Valve Clearance
0.015 inches*Hot0.381 mm
Exhaust Valve Clearance
0.015 inches*Hot0.381 mm
Fuel Type
diesel
Cylinders
6
Cooling
liquid-cooled
Oil Capacity
12 qts11.4 L
Engine Options
Allis Chalmers 7.0L 6-cyl diesel
Fuel Tank
52 gal196.8 L
D21 / 03
Gears & controls
Transmission
Transmission is controlled by means of a range control knob and a gear shift lever. The range knob is located below the steering wheel, pushing it forward puts the tractor in high range, pull it back engages low range. The gear shift selects one of four forward gears, or reverse. The tractor must be stopped and clutch used to change gears or range.
