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620 Specifications 

 

 

 

 

ENGINE

 

Universal Joints

no moving parts

 

 

 

Make

Onan

Hydrostatic Transmission

Sundstrand - Variable delivery piston type pump with fixed stroke piston type motor. Replaceable oil filter.

Model

CCKB

 

Cycle

4

 

Fuel

Gasoline

 

Cylinders

2 (opposed)

 

Cylinder Material

Cast Iron

Gear Transmission

3-Speed Sliding Spur

Cylinder Bore

3¼ inches

 

gear, Cast iron trans­

Stroke

3 inches

 

mission case, Rolling

Piston Displacement

49.8 Cubic Inches

 

contact bearings.

Horsepower @ 3600 RPM

19.5

Differential

8 pinion, spur gear, nonadjustable limited slip. Located in transmission case

Compression Ratio

7.0 to 1

 

.

High Speed (No Load)

3850 RPM (Revolutions per Minute) Maximum

 

 

 

 

Final Drive

Individual spur gears, rolling contact bearings, cast iron case.

 

 

High Speed (Full Load)

3600 RPM

 

Idle Speed

1200 RPM

 

 

Valves

Positive rotating

STEERING

 

 

Stellite facing on valve

Type

Recirculating ball screw,

 

heads

manual operation

Valve Tappet Clearance

In take .006-.008

Steering wheel revolutions

3.2 stop to stop

 

Exhaust .015"-.017 "

Steering wheel diameter

14"

Valve Seats

Replaceable, Stellite

 

 

 

faced

SEAT

 

Cooling System

Pressure air cooled, axial

 

 

 

flow blower

 

 

 

 

 

 

Carburetor

Zenith - Horizontal draft, adjustable main jet.

Standard lever operated seat

Adjustable from operator position 4 inches front to rear. Spring mounted, inclined ramp.

 

 

 

Fuel Filter

In fuel line

 

Choke

Manually operated

 

Air Cleaner

Replaceable paper element

 

 

 

Fuel Pump

Diaphram type

 

Governor

Cam gear driven, adjustable mechanical flyball, pressure lubricated

FRONT POWER TAKE OFF

 

 

Clutch

12 volt electric solenoid

 

 

actuated

Breaker point gap

.020 inch

Speed

Equal to engine RPM

Ignition Timing

200 before top dead

Drive

6-1/2 inches A section

 

center

 

pulley

Spark Plug

Allis-Chalmers No.2067308

 

 

REAR POWER TAKE OFF (Optional)

 

 

Spark Plug Gap

.025inch

Clutch

12 volt electric solenoid

Lubrication System

Gear type oil pump,

 

actuated

 

adjustable pressure relief

 

 

 

valve, replaceable oil filter

Speed (@ 3600 Engine RPM)

2000 RPM

 

 

 

Starting Motor

12 volt electric solenoid

Drive

1 inch internal 15

 

shift starter

 

tooth involute spline

 

Direction of Rotation

 

Clutch

Foot pedal operated, double V-belt drive, clutched by varying center distance between pulleys

 

 

Source:  AC Operator's Manual, 620 Tractor, Form 1609107, 8/73, courtesy of Frank Heizler

 

 

 

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