Allis-Chalmers WD Overview
The Allis-Chalmers WD was built from 1948 through 1953 and used a 201 ci (3.3 L) four-cylinder engine. Serial year, fuel setup, PTO equipment, and hitch parts all matter when comparing a tractor to manuals or parts catalogs.
For buyers and restorers, the WD is best checked as a working package: rear PTO, single-point hitch equipment, open-center hydraulics, tires, ballast, and actual serial number. Nebraska tests show why fuel setup matters, with tractor-fuel Test 399 and gasoline Test 440 reporting different drawbar and belt horsepower.
Use the operator manuals, parts catalog pointers, AGCO Heritage material, and Nebraska reports together. A short model name is not enough for ordering service parts or treating a test result as model-wide.
Allis-Chalmers WD Quick Answers
- Production yearsThe Allis-Chalmers WD was produced from 1948 through 1953.
- PowerClaimed PTO power is published separately as 26 hp (19.4 kW). Nebraska Test 399 recorded 24.31 drawbar hp and 26.14 belt hp for a tractor-fuel WD. Nebraska Test 440 recorded 30.23 drawbar hp and 34.63 belt hp for a gasoline WD with the 201 ci engine.
- EngineEngine displacement is 201 ci (3.3 L).
- PTO and hitchRear PTO is 540; hitch is Category Single Hitch Point.
- Service capacityHydraulic system capacity is 1.25 gal (4.7 L); coolant capacity is 14 qts (13.2 L).
Engine and Power
Engine: The WD uses a 201 ci (3.3 L) four-cylinder engine with 4.00x4.00 inch bore and stroke. Compression varies by fuel setup; Nebraska Test 440 identifies the gasoline test tractor as a 201 ci engine at 5.75:1 compression. Electrical starting is 6-volt.
Engine option 1
Allis Chalmers / tractor fuel / 4-cylinder 8-valve / liquid-cooled vertical I-head
| Displacement | 201 ci 3.3 L |
|---|---|
| Bore Stroke | 4.00x4.00 inches 102 x 102 mm |
| Compression | 4.5:1 |
| Rated Rpm | 1400 |
| Firing Order | 1-2-4-3 |
| Starter | electric |
| Starter Volts | 6 |
| Coolant Capacity | 14 qts 13.2 L |
Gasoline engine
Allis-Chalmers / gasoline / 4-cylinder 8-valve / liquid-cooled vertical I-head / In 1953 (SN 136318) a distributor ignition system replaced the older magneto system.
| Displacement | 201 ci 3.3 L |
|---|---|
| Bore Stroke | 4.00x4.00 inches 102 x 102 mm |
| Compression | 5.75:1 |
| Rated Rpm | 1400 |
| Firing Order | 1-2-4-3 |
| Starter | electric |
| Starter Volts | 6 |
Manufacturer
Manufacture years
Transmission
Transmission: Non-synchronized four-speed gearbox with 4 forward and 1 reverse. The clutch, PTO, and gearbox arrangement influence service and parts decisions.
4-speed non-synchronized gear
| Type | non-synchronized gear |
|---|---|
| Gears | 4 forward and 1 reverse |
PTO and Hitch
PTO and hitch: Rear PTO is 540; rear hitch is a single hitch point.
Rear PTO
Rear PTO type
Rear hitch
Hydraulics
Hydraulics: Open-center hydraulic system, 1200 psi, 1.25 gal capacity. One valve is optional depending on configuration.
Type
Capacity
Pressure
Valves
Fluids, Battery, and Service Facts
Maintenance: Published capacities include hydraulic system 1.25 gal and coolant capacity 14 qts; battery is 6V. Fluid types, filters, belts, and clutch/PTO parts require confirmation from a parts catalog or manual before ordering.
Fuel tank
Hydraulic system
Battery volts
Tires and Dimensions
Tire and dimension values can vary by wheel, axle, and configuration.
Configuration-specific values are split out where the same model has documented differences by engine, transmission, or equipment.
Wheelbase
Weight
Length
Height
Front tire
Rear tire
Ag front
Ag rear
- 11-28
- 12-28
Electrical
Electrical rows are included when documented.
Ground
Charging system
Battery volts
Serial Number Lookup
Serials: Serial ranges help narrow by model year; factory prefixes and regional differences require documentation before applying year tables beyond the stated range.
1948
1949
1950
1951
1952
1953
Manuals and Documents
The documents below add manual, parts, and test context for the Allis-Chalmers WD. They are useful for controls, service categories, parts matching, and tested-performance details that do not fit into short spec rows.
Match coverage carefully before relying on a document for service decisions, especially when one manual, catalog, or report covers several models, fuel types, transmissions, or tractor variants.
Manual
- Allis Chalmers WD Tractor Operators Manualoperation, lubrication
WD operator manual for Allis-Chalmers WD (1948-1953); covers operation, lubrication, and capacities such as radiator (coolant) capacity and engine oil capacity.
Open source - Allis-Chalmers WD Operators Manualoperation, lubrication
WD Operators Manual (reprint) covering operation, maintenance and parts references for WD; includes sections on fuel, lubrication, and cooling system.
Open source
Parts catalog
- Allis-Chalmers WD WD45 Parts Catalog (PDF)parts matching
Allis-Chalmers WD/WD45/WD45 Diesel tractor parts catalog; exploded views and part numbers for WD family, including WD and WD45 diagrams.
Open source
Manufacturer document
- Allis-Chalmers Heritage Catalogparts matching
AGCO Allis-Chalmers heritage catalog; manufacturer documentation covering model WD (1948-1953) and related information for parts, maintenance references, and identification.
Open source
Tractor test report
- Nebraska Test 399: WD tractor fueltested performance
Official Nebraska report for an Allis-Chalmers WD on tractor fuel, including observed drawbar and belt horsepower.
Open test report - Nebraska Test 440: WD gasolinetested performance
Official Nebraska report for a gasoline Allis-Chalmers WD, including observed drawbar and belt horsepower.
Open test report
Parts Checks Before Ordering
Do not order Allis-Chalmers WD parts from the model name alone. Match the part to the tractor's model code, serial range, engine, transmission, and PTO setup before selecting service parts.
Filters, fluids, belts, electrical parts, clutch and PTO parts, and hydraulic components can vary by configuration. Exact part numbers require a parts catalog, manual, or trusted supplier source before they become recommendations.
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.