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

FeatureAllis Chalmers D21 Series ITractorOliver 1755Tractor
Tractor TypeRow-Crop TractorRow-Crop Tractor
Horsepower76.8 kW—
Weight4310.0 kg4355.0 kg
Transmission TypeSliding gear with dry disc clutchPartial power shift
Length407.0 cm387.0 cm
Years Made1963-19651970-1975
Engine ModelAllis Chalmers 3400Waukesha-Oliver
Engine Type4-stroke, liquid-cooled, inline4-stroke, liquid-cooled, inline
Fuel TypeDieselGasoline
Cylinders66
Displacement6980 cc4638 cc
Bore10.79 cm9.80 cm
Stroke12.70 cm10.21 cm
Rear PTO TypeIndependentIndependent
Rear PTO Speed1.000 RPM540, 1000 RPM
Rated RPM2200 RPM—
Compression Ratio16.0:18.5:1
BatteryTwo or four 12V, 95Ah—
StarterElectricElectric
Height270.0 cm217.0 cm
Width232.0 cm204.0 cm
Wheelbase244.0 cm219.0 cm
Fuel Tank Capacity196.8 l132.5 l
Oil Capacity11.4 l7.6 l
Coolant Capacity19.9 l18.9 l
Transmission Oil Capacity87.1 l—
Transmission ModelPower DirectorHydraul-Shift
Gears8 forward and 2 reverse18 forward and 6 reverse
Chassis4×2 2WD4×2 2WD or 4×4 MFWD 4WD
Max. Travel Speed11.0 km/h9.3 km/h
BrakesBand actuated discDifferential hydraulic dry disc
Drawbar CategoryIII/IIII/I or III/II
Cabin TypeOpen operator stationOpen operator station. Optional two-post ROPS and cab.
Steering TypePowerPower
Front TiresAg: 7.50×20Ag: 7.50-15 , 13.6-24
Rear TiresAg: 18.4×34Ag: 18.4-34
Lift Capacity—2721.0 kg
Pump Flow—75.7 LPM
Horsepower (PTO)—64.1 kW
Ground Clearance—34.0 cm
Hydraulic Capacity—25.5 l
Hydraulic Type—Closed center
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