Allis Chalmers 620 sub-compact utility tractor: review and specs

The Allis Chalmers 620 is a 2WD sub-compact utility tractor manufactured by Simplicity for distributor Allis Chalmers from 1973 to 1975. The Allis Chalmers 620 is equipped with a 0.8 L (49.8 cu·in) two-cylinder gasoline engine and a hydrostatic transmission with infinite (3-range) forward and reverse gears.

The Allis Chalmers 620 sub-compact utility tractor used the Onan CCKB engine. It is a 0.8 L, 816 cm², (49.8 cu·in) two-cylinder natural aspirated gasoline engine with 83.0 mm (3.27 in) of the cylinder bore and 76.0 mm (2.99 in) of the piston stroke. The compression ratio rating is 7.0:1. This engine produced 19.7 PS (14.5 kW; 19.5 HP) at 3,600 rpm of output power.

Allis Chalmers 620 Specifications

General Specifications
Model	Allis Chalmers 620
Length	2,100 mm (82.7 in)
Width	1,210 mm (47.6 in)
Height	1,090 mm (42.9 in)
Wheel base	–
Ground clearance	380 mm (15 in)
Weight	680 kg (1,499 lbs)
Fuel tank capacity	14.5 liters (3.8 US gal.; 3.2 Imp. gal)
Battery	12V
Cabin type	Open operator station
Engine
Engine model	Onan CCKB
Engine type	Four-stroke, air-cooled, inline
Cylinders	2
Fuel type	Gasoline
Displacement	0.8 L, 816 cm², (49.8 cu·in)
Bore and stroke	83.0 mm X 76.0 mm (3.27 in X 2.99 in)
Compression ratio	7.0:1
Horsepower	19.7 PS (14.5 kW; 19.5 HP) at 3,600 rpm
Starter	Electric
Oil capacity:	3.3 L (3.5 US. qt, 2.9 Imp. qt.)

Transmission and chassis
Chassis	4×2 2WD
Steering type	–
Brakes	–
Transmission model
Transmission type	Hydrostatic
Gears	Infinite (3-range) forward and reverse
Tires
Front tires	Ag: 4.00×12 Lawn/turf: 20-8×10
Rear tires	Ag: 8×16 Lawn/turf: 29-12.5×15

Three-Point Hitch
Caterogy	0
Control type	–
Lift capacity (at ends)	–
PTO (Power take-off shaft)
Front PTO type	–
Front PTO speed	2,000 rpm
Rear PTO type	–
Rear PTO speed	2,000 rpm
Hydraulic system
Hydraulic type	–
Hydraulic capacity	4.7 L (4.97 US. qt, 4.14 Imp. qt.)
Pressure	500 psi (34.5 bar)
Pump flow	2.25 gpm (8.5 lpm)

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