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Manufacturer-sourced values side by side. No performance equivalence or ranking is applied across different machine classes.

FeatureDavid Brown 900TractorAllis Chalmers WD45Tractor
Tractor TypeRow-Crop TractorRow-Crop Tractor
Horsepower33.9 kW—
Weight1770.0 kg1810.0 kg
Lift Capacity816.0 kg—
Transmission TypeGear typeSliding gear with wet disc clutch
Length287.0 cm325.0 cm
Years Made1956-19581953-1957
Engine ModelDavid Brown PAG4/30HAllis-Chalmers WD45D
Engine Type4-stroke, liquid-cooled, inline4-stroke, liquid-cooled, inline
Fuel TypeGasolineDiesel
Cylinders46
Displacement2704 cc3769 cc
Bore9.19 cm8.71 cm
Stroke10.21 cm10.49 cm
Rear PTO TypeTransmission or liveLive
Rear PTO Speed540 RPM540 RPM
Rated RPM2200 RPM—
Compression Ratio7.0:115.5:1
StarterElectricelectric
Height197.0 cm207.0 cm
Wheelbase182.0 cm223.0 cm
Ground Clearance40.0 cm—
Fuel Tank Capacity43.5 l56.8 l
Oil Capacity6.6 l6.6 l
Coolant Capacity13.2 l16.0 l
Transmission ModelDavid Brown—
Gears6 forward and 2 reverse4 forward and 1 reverse
Chassis4×2 2WD4×2 2WD
Max. Travel Speed10.7 km/h5.2 km/h
BrakesMechanical drumMechanical band
Drawbar CategoryI—
Cabin TypeOpen operator stationOpen operator station. Allis-Chalmers Half Cab
Steering TypeManualManual or power
Front TiresAg: 6.00×16Ag: 5.50-16
Rear TiresAg: 11.25×28Ag: 12-28, 13-28
Torque Speed—390.5 N·m
Battery—6 V, CCA:115
Transmission Oil Capacity—16.0 l
Hitch Type—Snap-Coupler
Sourceheavyequipments.net archive (imported 2026-10)heavyequipments.net archive (imported 2026-10)
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Side-by-side specification comparisons generated from the manufacturer-sourced model files. · 7,051