Allis Chalmers 8550 four-wheel drive: review and specs

The 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
Model	Allis Chalmers 8550
Length	7,230 mm (284.6 in)
Width	2,420 mm (95.3 in) With long axle: 3,030 mm (119.5 in)
Height	3,530 mm (139 in)
Wheel base	3,200 mm (126 in)
Ground clearance	430 mm (16.9 in)
Weight	12,265 kg (27,040 lbs)
Fuel tank capacity	643.5 liters (170 US gal.; 141.6 Imp. gal)
Battery	Four 12V
Cabin type	Acousta Cab II with heat and air-conditioning.
Engine
Engine model	Allis Chalmers 6120T
Engine type	Four-stroke, liquid-cooled, inline
Cylinders	6
Fuel type	Diesel
Displacement	12.0 L, 11,980 cm², (731.0 cu·in)
Bore and stroke	133.0 mm X 159.0 mm (5.24 in X 6.26 in)
Compression ratio	16.25:1
Horsepower	304.2 PS (223.7 kW; 300 HP) at 2,500 rpm
Starter	Electric
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
Chassis	4×4 MFWD 4WD
Steering type	Hydrostatic power
Brakes	Hydraulic wet discs
Transmission model	Power Director
Transmission type	Partial power shift
Gears	20 forward and 4 reverse
Speed	Forward: 30.1 kmh (18.7 mph) Reverse: 18.7 (11.6 mph)
Tires
Front tires	Ag: 18.4×38,
Rear tires	Ag: 18.4×38

Three-Point Hitch
Caterogy	IV/III
Control type	–
Lift capacity (at ends)	–
PTO (Power take-off shaft)
Rear PTO type	Independent
Rear PTO speed	1,000 rpm
Hydraulic system
Hydraulic type	Closed center
Valves	3 or 4
Pump flow	74.9 gpm (283.5 lpm)

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