SPECS / COMPARISON

Compare models

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

Feature	John Deere 820Tractor	David Brown 770 SelectamaticTractor
Tractor Type	Utility Tractor	Utility Tractor
Horsepower	23.9 kW	26.8 kW
Transmission Type	Collar shift	Gear type with dry disc clutch
Length	342.0 cm	285.0 cm
Years Made	1968-1973	1965-1970
Engine Model	John Deere	David Brown AD3/49
Engine Type	4-stroke, liquid-cooled, inline	4-stroke, liquid-cooled, inline
Fuel Type	Diesel	Diesel
Cylinders	3	3
Displacement	2489 cc	2394 cc
Bore	9.80 cm	10.01 cm
Stroke	11.00 cm	10.21 cm
Rear PTO Type	Live	Live
Rear PTO Speed	540 RPM	540 RPM
Rated RPM	2100 RPM	2055 RPM
Compression Ratio	16.7:1	17.0:1
Battery	Two 12V, 55Ah	12 V, 96Ah
Starter	Electric	Electric
Height	199.0 cm	204.0 cm
Wheelbase	188.0 cm	190.0 cm
Fuel Tank Capacity	62.5 l	43.0 l
Oil Capacity	6.2 l	7.4 l
Hydraulic Capacity	37.9 l	—
Gears	8 forward and 4 reverse	12 forward and 4 reverse
Chassis	4×2 2WD	4×2 2WD
Differential Lock	Mechanical rear	Mechanical rear
Drawbar Category	I	I
Cabin Type	Open operator station or ROPS	Open operator station
Front Tires	Ag: 5.50-16, 6.00-16Lawn/turf: 27/9.5-15, 23/10.5-12	Ag: 6.00-16, 5.50-16
Rear Tires	Ag: 12.2-28, 13.6-28Lawn/turf: 16.9-24, 16.5L-16	Ag: 12.4/11-28, 11.2/10-28
Hydraulic Type	Open center	Open center
Weight	—	1485.0 kg
Torque Power	—	1400 RPM
Torque Speed	—	135.6 N·m
Coolant Capacity	—	11.4 l
Transmission Oil Capacity	—	27.3 l
Final Drive	—	Spur gear
Max. Travel Speed	—	12.9 km/h
Brakes	—	Mechanical drum
Hitch Type	—	Position and draft control
Steering Type	—	Manual
Working Pressure	—	137.9 bar
Source	heavyequipments.net archive (imported 2026-10)	heavyequipments.net archive (imported 2026-10)

POPULAR COMPARISONS

MODEL COMPARISONS

Side-by-side specification comparisons generated from the manufacturer-sourced model files. · 7,051