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Tractor · 1978Unverified

Allis Chalmers 8550

Name: Allis Chalmers 8550
Brand: Allis Chalmers

Allis Chalmers 8550 — Four-wheel Drive (4WD) tractor · 254 hp. Reference specifications; pending source verification.

The Allis Chalmers 8550 is a tractor rated at 254 hp, categorising it amongst the more powerful machines in its class. Manufactured from 1978 to 1981, this model is equipped with a 6-cylinder turbocharged diesel liquid-cooled engine, which powers a four-wheel drive system via a hydrostatic transmission. The listed weight of the Allis Chalmers 8550 ranges from 26400 to 27040 pounds. It is designed for use on large areas, including 1,500+ acres.

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

Catalogue coverage

Variants represented

Richest spec table

91 rows

Recorded power

254 hp

Transmissions

20-speed partial power shift

Production years

1978-1981

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

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.

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