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Allis Chalmers 8550

Allis Chalmers 8550 tractor
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The Allis Chalmers 8550 is a four-wheel drive (4WD) tractor produced from 1978 to 1981. It features a powerful 12.0L 6-cylinder turbocharged diesel engine delivering 300 hp. The tractor has a 20-speed partial power shift transmission with Power Director and hydrostatic power steering. It includes hydraulic wet disc brakes and an Acousta Cab II with heat and air-conditioning. The 8550 has a closed center hydraulic system with 3 or 4 valves and a pump flow of 74.9 gpm. It is equipped with a rear independent PTO of 1000 rpm and a rear hitch type IV/III. Dimensions include a 126 inch wheelbase, 285 inch length, and widths up to 119.5 inches with long axle. The tractor weighs between 26,400 and 29,360 lbs depending on configuration. Tires vary with multiple options for front and rear. Electrical system features a negative ground, alternator charging, and four 12-volt batteries.
Allis Chalmers 8550tractor4WD300 hpdiesel enginetransmissiondimensionshydraulicsPTOfarm tractor
Power300 hp
Founded1978 - 1981
Model8550

Technical Specifications

Detailed specifications and technical data for Allis Chalmers 8550

Power

Engine:300 hp (223.7 kW)
PTO (tested):253.88 hp (189.3 kW)
PTO (claimed):250 hp (186.4 kW)
Drawbar (tested):217.92 hp (162.5 kW)
Drawbar (claimed):210 hp (156.6 kW)

Tires

Ag rear:18.4x38, 20.8x34, 20.8x38, 23.1x30, 24.5x32, 30.5x32
Ag front:18.4x38, 20.8x34, 20.8x38, 23.1x30, 24.5x32, 30.5x32

Engine

Type:turbocharged diesel
Model:Allis Chalmers 6120T
Power:300 hp (223.7 kW)
Cooling:liquid-cooled inline
Idle RPM:775-2800
Cylinders:6-cylinder 24-valve
Fuel tank:170 gal (643.5 L)
Rated RPM:2500
Air cleaner:dry
Bore/Stroke:5.25x6.25 inches (133 x 159 mm)
Compression:16.25:1
Displacement:731 ci (12.0 L)
Firing order:1-5-3-6-2-4
Oil capacity:46 qts (2 filter) (43.5 L), 60 qts (3 filter) (56.8 L)
Starter volts:12
Coolant capacity:72 qts (68.1 L)
Intake valve clearance:0.015 inches (hot) (0.381 mm)
Exhaust valve clearance:0.020 inches (hot) (0.508 mm)

Height

Cab:139 inches (353 cm)
Hood:90.3 inches (229 cm)
Exhaust:154 inches (391 cm)

Weight

Shipping:26,400 lbs (duals) (11975 kg)
Ballasted:29,360 lbs (13317 kg)
Operating:27,040 lbs (12265 kg)

Dimensions

Width:95.5 inches (242 cm), 119.5 inches (long axle) (303 cm)
Length:285 inches (723 cm)
Wheelbase:126 inches (320 cm)
Rear tread:62 to 123 inches (157 to 312 cm)
Front tread:62 to 123 inches (157 to 312 cm)
Ground clearance:17 inches (43 cm)

Electrical

Ground:negative
Batteries:4
Battery volts:12
Charging system:alternator

Hydraulics

Type:closed center
Valves:3 or 4
Pump flow:74.9 gpm (283.5 lpm)

Mechanical

Cab:Acousta Cab II standard with heat and air-conditioning. Optional radio and 8 track tape deck.
Drive:Four-wheel drive
Brakes:Hydraulic wet discs brakes
Steering:hydrostatic power

Production

Type:Four-wheel Drive (4WD) tractor
Original price:$86,753
Years produced:1978 - 1981

Transmission

Type:Power Director partial power shift
Gears:20 forward and 4 reverse

Tractor hitch

Rear Type:IV/III

Power Take-off (PTO)

Rear PTO:independent
Rear PTO Type:1000

Related Models

Allis Chalmers 4W-305

Model:4W-305