Wikitractor

Allis Chalmers 8550

Production ended · 4WD or Tracks

PTO power · claimed

250 hp

Weight
27,040 lb
Engines
1 Diesel
Built
no record
Price new
no record

Power

Engine300 hp unspecified
PTO250 hp claimed
PTO, tested253.9 hp
Drawbar210 hp claimed
Drawbar, tested217.9 hp
Listed power300 hp engine basis

Engines

Allis Chalmers 12.0L 6-cyl dieselDiesel · 6 cyl731 ci
Engine details
Allis Chalmers 12.0L 6-cyl diesel
Bore × stroke
5.25 in × 6.25 in
Rated speed
2,500 rpm
Rated power
300 hp
Compression
16.25:1
Aspiration
turbocharged diesel
Cooling
liquid-cooled inline
Firing order
1-5-3-6-2-4
Notes
6-cylinder 24-valve

Transmissions

Power Directorpartial power shift20F / 4R

Weight

Weight27,040 lb operating
Shipping26,400 lb
Ballasted29,360 lb

Dimensions

Wheelbase126 in
Length285 in
Width95.5 in
Height139 in unspecified
Ground clearance17 in
Front tread, narrowest62 in
Front tread, widest123 in
Rear tread, narrowest62 in
Rear tread, widest123 in

Capacities

Fuel tank170 gal

Hydraulics

Systemclosed center
Pump flow74.9 gpm
Remote valves3 or 4

Hitch

Rear hitch categoryIV/III
Rear lift capacityno record

PTO

Rear PTOindependent
Rear PTO speeds1000

Chassis

Drive4WD/tracks
Steeringhydrostatic power
BrakesHydraulic wet discs brakes

Tires

Front18.4x38
Rear18.4x38

Electrical

System voltage12 V
Batteries4
Chargingalternator
Groundnegative

Production

Built byAllis Chalmers

Serial numbers

Front frame, rear left side

YearFirst serial
19781083
19791342
19801553
19811723

Literature

  • Four-wheel drives - mammoth size... Allis Chalmers, 1978
  • 8550 Allis Chalmers, 1977