The Allis Chalmers 620 is a lawn tractor rated at 20 hp, categorising it among higher-powered models in its class. Manufactured from 1973 to 1975, the 620 features a 2-cylinder petrol air-cooled engine, which powers two-wheel drive via a hydrostatic transmission. The listed weight of the 620 is 589 kg, and it is intended for tasks requiring up to 200 acres.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
20 hp
Weight
589 kg
Catalogue coverage
Variants represented
2
Richest spec table
66 rows
Recorded power
20 hp
Recorded weight
589 kg
Transmissions
hydrostatic
Production years
1973-1975
Verified variants
0
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Overview
DistributorAllis ChalmersReference
ManufacturerSimplicityReference
Garden tractorReference
Built in Port Washington, Wisconsin, USAReference
Two-wheel driveReference
Manual steeringReference
Disc brakesReference
Open operator station.Reference
Variants
4041similar Simplicity modelReference
Engine
19.5HP Onan 816cc 2-cyl gasolineReference
Onan CCKBReference
gasolineReference
2-cylinderReference
air-cooled horizontal-shaft opposed-twinReference
Displacement49.8 ciReference
Bore/Stroke83 x 76 mmReference
Power (gross)14.5 kWReference
Air cleanerpaper elementReference
Compression7:1Reference
Rated RPM3600Reference
Starter volts12Reference
Oil capacity3.3 LReference
Transmission
hydrostaticReference
ManufacturerSundstrandReference
TypehydrostaticReference
Gearsinfinite forward and reverse (3-range)Reference
Capacities
Fuel14.4 LReference
PTO & Hydraulics
Hydraulic system4.7 LReference
Capacity4.7 LReference
Pressure34.5 barReference
Pump flow8.5 lpmReference
Rear Type0Reference
Rear PTOindependentReference
ClutchelectricReference
Rear PTO Type2000Reference
Front PTOindependentReference
Front PTO Type3600Reference
Dimensions
Wheelbase142 cmReference
Weight589 kgReference
Front tire20x8-10Reference
Rear tire29x12.50-15Reference
Ag front4.00x12Reference
Ag rear8x16Reference
Lawn/turf front20x8-10Reference
Lawn/turf rear29x12.50-15Reference
Length210 cmReference
Width121 cmReference
Height109 cmReference
Shipping weight589 kgReference
Ground clearance38 cmReference
Allis Chalmers 620 attachments
60" mid-mount mower deckReference
snowblowerReference
bladeReference
front-end loaderReference
620 Serial Numbers
Location:Serial number decal on the right side of the tractor frame, above the foot rest.Reference
Electrical
GroundnegativeReference
Charging amps20Reference
Battery volts12Reference
Attachment overview
60" mid-mount mower deckReference
SnowblowerReference
BladeReference
Front-end loaderReference
60" Mower deck
Typemid-mount Allis ChalmersReference
Type3-blade with hydraulic liftReference
Cutting width152 cmReference
Cut height4 to 7 cmReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
