Allis Chalmers 8550

Allis Chalmers 8550The Allis Chalmers 8550 is a four-wheel drive tractor manufactured by Allis Chalmers in from 1978 to 1981. The Allis Chalmers 8550 is equipped with a 12.0 L (731.[ cu·in) six-cylinder diesel engine and a partial power shift transmission with 20 forward and 4 reverse gears.

The Allis Chalmers 8550 tractor used the Allis Chalmers 6120T engine. It is a 12.0 L, 11,980 cm2, (731.0 cu·in) six-cylinder turbocharged diesel engine with 133.0 mm (5.24 in) of the cylinder bore and 159.0 mm (6.26 in) of the piston stroke. The compression ratio rating is 16.25:1. This engine produced 304.2 PS (223.7 kW; 300.0 HP) at 2,500 rpm of output power.

The Allis Chalmers 8550 is equipped with hydrostatic power steering, hydraulic wet discs brakes, Acousta Cab II with heat and air-conditioning, and 643.5 liters (170 US gal.; 141.6 Imp. gal) fuel tank.

Allis Chalmers 8550 Specifications

General Specifications
ModelAllis Chalmers 8550
Length7,230 mm (284.6 in)
Width2,420 mm (95.3 in)
With long axle: 3,030 mm (119.5 in)
Height3,530 mm (139 in)
Wheel base3,200 mm (126 in)
Ground clearance430 mm (16.9 in)
Weight12,265 kg (27,040 lbs)
Fuel tank capacity643.5 liters (170 US gal.; 141.6 Imp. gal)
BatteryFour 12V
Cabin typeAcousta Cab II with heat and air-conditioning.
Engine modelAllis Chalmers 6120T
Engine typeFour-stroke, liquid-cooled, inline
Fuel typeDiesel
Displacement12.0 L, 11,980 cm2, (731.0 cu·in)
Bore and stroke133.0 mm X 159.0 mm (5.24 in X 6.26 in)
Compression ratio16.25:1
Horsepower304.2 PS (223.7 kW; 300 HP) at 2,500 rpm
Oil capacity: With 2 filters: 43.5 L (46.0 US. qt, 38.3 Imp. qt.)
With 3 filters: 56.8 L (60.0 US. qt, 50.0 Imp. qt.)
Coolant capacity:68.1 L (72 US. qt, 59.9 Imp. qt.)
Transmission and chassis
Chassis4×4 MFWD 4WD
Steering typeHydrostatic power
BrakesHydraulic wet discs
Transmission modelPower Director
Transmission typePartial power shift
Gears20 forward and 4 reverse
Speed Forward: 30.1 kmh (18.7 mph) Reverse: 18.7 (11.6 mph)
Front tiresAg: 18.4×38,
Rear tiresAg: 18.4×38
Three-Point Hitch
Control type
Lift capacity (at ends)
PTO (Power take-off shaft)
Rear PTO typeIndependent
Rear PTO speed1,000 rpm
Hydraulic system
Hydraulic typeClosed center
Valves3 or 4
Pump flow74.9 gpm (283.5 lpm)
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