Tractor · 1948Unverified
Allis Chalmers WD
Allis Chalmers WD — Row-Crop tractor · 26 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
26 hp
Max power
18.1 kW
Weight
1587 kg
Hover a source tag to verify
Overview
ManufacturerAllis ChalmersReference
Row-Crop tractorReference
Built in West Allis, Wisconsin, USAReference
Total built146,125Reference
Original price$1,830Reference
The Allis-Chalmers WD featured Two-Clutch Power Control and power-shifted rear wheels. The dual clutch system used a foot-operated dry clutch to disconnect the PTO and driveline from the engine. A hand-operated wet clutch allowed the PTO to operate while the tractor was slowed or stopped.Reference
Two-wheel driveReference
Steeringmanual worm and horizontal sectorReference
Manual external compression band type brakesReference
Open operator station.Reference
Engine
Allis Chalmers 3.3L 4-cyl tractor fuelReference
Allis-Chalmers 3.3L 4-cyl gasolineReference
Drawbar (claimed)14.2 kWReference
Drawbar (tested)22.5 kWReference
Belt (tested)25.8 kWReference
Allis ChalmersReference
tractor fuelReference
4-cylinder 8-valveReference
liquid-cooled vertical I-headReference
Displacement3.3 LReference
Bore/Stroke102 x 102 mmReference
Compression4.5:1Reference
Rated RPM1400Reference
Firing order1-2-4-3Reference
StarterelectricReference
Starterhand crankReference
Starter volts6Reference
Coolant capacity13.2 LReference
Allis-ChalmersReference
gasolineReference
In 1953 (SN 136318) a distributor ignition system replaced the older magneto system.Reference
Compression5.75:1Reference
Belt power (max)19.5 kWReference
Max power18.1 kWReference
Belt power (max)25.8 kWReference
Max power22.5 kWReference
Transmission
4-speed non-synchronized gearReference
Typenon-synchronized gearReference
Gears4 forward and 1 reverseReference
PTO & Hydraulics
PTO (claimed)19.4 kWReference
Hydraulic system4.7 LReference
Typeopen centerReference
Capacity4.7 LReference
Pressure82.7 barReference
Valves1Reference
Rear TypeSingle Hitch PointReference
Rear PTOtransmissionReference
Rear PTOliveReference
Rear PTO Type540Reference
Capacities
Fuel56.8 LReference
Dimensions
Wheelbase223 cmReference
Weight1587 kgReference
Front tire5.50-16Reference
Rear tire11-28Reference
Ag front5.50-16Reference
Ag rear11-28Reference
Ag rear12-28Reference
Length322 cmReference
Height207 cmReference
Operating weight1587 kgReference
Ballasted weight2290 kgReference
Rear tread141 to 228 cmReference
WD Serial Number Location
The WD serial number is stamped into the rear of the transmission case on the left side.Reference
WD Serial Numbers
19487Reference
19499250Reference
195035445Reference
195172328Reference
1952105182Reference
1953131243Reference
FAQ: How to read a serial number table.Reference
Electrical
GroundpositiveReference
Charging systemDelco generatorReference
Battery volts6Reference
Test results
NTTL 399: tractor fuel 4-speed 2WDReference
NTTL 440: gasoline 4-speed 2WDReference
Tractor fuel 4-speed 2WDJuly 16 - 30, 1948Link: Nebraska Tractor Test 399 fileReference
Belt fuel use (max)10.2 l/hourReference
Drawbar performanceReference
Gear 2 used for power test.Reference
Max pull1552 kgReference
Gear 1 used for pull test.Reference
Gasoline 4-speed 2WDMay 17 - June 1, 1950Link: Nebraska Tractor Test 440 fileReference
Belt fuel use (max)12.1 l/hourReference
Gear 3 used for power test.Reference
Max pull1952 kgReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.