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

FeatureAllis Chalmers D12TractorJohn Deere 820Tractor
Tractor TypeRow-Crop TractorUtility Tractor
Horsepower23.1 kW23.9 kW
Weight1270.0 kg—
Transmission TypeSliding gearCollar shift
Length307.0 cm342.0 cm
Years Made1959-19681968-1973
Engine ModelAllis-ChalmersJohn Deere
Engine Type4-stroke, liquid-cooled, inline4-stroke, liquid-cooled, inline
Fuel TypeGasolineDiesel
Cylinders43
Displacement2442 cc2489 cc
Bore8.89 cm9.80 cm
Stroke9.80 cm11.00 cm
Rear PTO Speed540 RPM540 RPM
Rated RPM1650 RPM2100 RPM
Compression Ratio7.5:116.7:1
Battery6 VTwo 12V, 55Ah
StarterElectricElectric
Height194.0 cm199.0 cm
Wheelbase200.0 cm188.0 cm
Fuel Tank Capacity47.3 l62.5 l
Oil Capacity3.8 l6.2 l
Coolant Capacity7.6 l—
Gears4 forward and 1 reverse8 forward and 4 reverse
Chassis4×2 2WD4×2 2WD
Max. Travel Speed5.6 km/h—
Drawbar CategoryII
Cabin TypeOpen operator stationOpen operator station or ROPS
Steering TypeManual—
Front TiresAg: 5.00-15Ag: 5.50-16, 6.00-16Lawn/turf: 27/9.5-15, 23/10.5-12
Rear TiresAg: 10-24Ag: 12.2-28, 13.6-28Lawn/turf: 16.9-24, 16.5L-16
Hydraulic TypeLiveOpen center
Valves1 or 2—
Rear PTO Type—Live
Hydraulic Capacity—37.9 l
Differential Lock—Mechanical rear
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