Tractor · 1978Unverified
Allis Chalmers 8550
Allis Chalmers 8550 — Four-wheel Drive (4WD) tractor · 254 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
254 hp
Max power
162.5 kW
Weight
26400 to 27040 pounds
Hover a source tag to verify
Overview
ManufacturerAllis ChalmersReference
Four-wheel Drive (4WD) tractorReference
Original price$86,753Reference
Four-wheel driveReference
Steeringhydrostatic powerReference
Hydraulic wet discs brakesReference
Acousta Cab II standard with heat and air-conditioning. Optional radio and 8 track tape deck.Reference
Engine
Allis Chalmers 12.0L 6-cyl dieselReference
Fuel tank643.5 LReference
Engine223.7 kWReference
Drawbar (claimed)156.6 kWReference
Drawbar (tested)162.5 kWReference
Allis Chalmers 6120TReference
turbocharged dieselReference
6-cylinder 24-valveReference
liquid-cooled inlineReference
Displacement12.0 LReference
Bore/Stroke133 x 159 mmReference
Power223.7 kWReference
Air cleanerdryReference
Compression16.25:1Reference
Rated RPM2500Reference
Idle RPM775-2800Reference
Firing order1-5-3-6-2-4Reference
Starter volts12Reference
Oil capacity43.5 LReference
Oil capacity56.8 LReference
Coolant capacity68.1 LReference
Intake valve clearance0.381 mmReference
Exhaust valve clearance0.508 mmReference
Power at rated engine speed189.3 kWReference
Max power162.5 kWReference
Transmission
20-speed partial power shiftReference
TransmissionPower DirectorReference
Typepartial power shiftReference
Gears20 forward and 4 reverseReference
PTO & Hydraulics
PTO (claimed)186.4 kWReference
PTO (tested)189.3 kWReference
Typeclosed centerReference
Valves3 or 4Reference
Pump flow283.5 lpmReference
Rear TypeIV/IIIReference
Rear PTOindependentReference
Rear PTO Type1000Reference
Dimensions
Wheelbase320 cmReference
Weight26400 to 27040 poundsReference
Front tire18.4x38Reference
Rear tire18.4x38Reference
Ag front18.4x38Reference
Ag rear18.4x38Reference
Ag front20.8x34Reference
Ag front20.8x38Reference
Ag front23.1x30Reference
Ag front24.5x32Reference
Ag front30.5x32Reference
Ag rear20.8x34Reference
Ag rear20.8x38Reference
Ag rear23.1x30Reference
Ag rear24.5x32Reference
Ag rear30.5x32Reference
Length723 cmReference
Width242 cmReference
Width303 cmReference
Ground clearance43 cmReference
Front tread157 to 312 cmReference
Rear tread157 to 312 cmReference
Shipping11975 kgReference
Operating12265 kgReference
Ballasted13317 kgReference
8550 Serial Numbers
Location:Front frame, rear left sideReference
19781083Reference
19791342Reference
19801553Reference
19811723Reference
FAQ: How to read a serial number table.Reference
Electrical
GroundnegativeReference
Charging systemalternatorReference
Batteries4Reference
Battery volts12Reference
Allis Chalmers 8550 Height
Hood229 cmReference
Cab353 cmReference
Exhaust391 cmReference
Test results
Diesel 20-speed 4WDOctober 15 - 28, 1977Link: Nebraska Tractor Test 1262 fileReference
PTO performanceReference
Fuel use65.9 l/hourReference
Drawbar performanceReference
Fuel use66.2 l/hourReference
Gear 5SL used for power test.Reference
Max pull11893 kgReference
Gear 2SL used for pull test.Reference
Speeds
Allis 8550 speeds with 18.4x38 tires.Reference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.