HYDRAULIC LIFT SYSTEM

TM 10-3930-638-24&P

cylinders move in opposite directions when pressure is

1. STEERING GEAR ASSEMBLY. Consists of steering

applied.

column and rotary hydrostatic valve; has four hydraulic

2. STEERING CYLINDERS. Two used, one mounted

connections. Operated by moving steering wheel attached

on each side of truck. Each end of cylinder attached to

to shaft of steering column. When turned, steering gear

front and rear chassis.

controls flow of hydraulic oil to and from steering cylinders.

3. STEERING BYPASS VALVE. When open, allows

Connections for pump pressure line, return line, and right

hydraulic oil to be transferred from one steering cylinder

and left turn oil flow to steering cylinders. Lines from

to the other for towing forklift truck.

right and left ports connect to tees; lines from tees to

steering cylinders are cross-connected so that steering

1-24. BODY AND TOWING

ATTACHMENTS

1. BODY. Constructed of heavy duty steel; consists of

Protects operator from falling material and injuries due to

front and rear chassis to which are bolted front and rear

truck rolling over.

fenders, engine hood and panels, and radiator shroud.

3. PINTLE AND TOW BAR. Located at rear of truck.

2. ROLL OVER PROTECTIVE STRUCTURE.

Pintle hook, tow bar and chains used for towing truck or

other vehicles.

Constructed of heavy duty steel; bolted to front chassis.

1-25. HYDRAULIC LIFT SYSTEM

3. TILT CYLINDERS. Two used. Activated by control

1. CONTROL VALVE. Controls hydraulic oil flow to

valve; tilts mast assembly forward or rearward. Minimum

lift, tilt, rotation, and side shift cylinders. Consists of an

forward tilt is 11 degrees; minimum rearward tilt is 22

inlet and outlet section, four spool (working) sections and

degrees.

an end section. Each spool section controls a cylinder or

4. SIDE SHIFT CYLINDER. One used. Activated by

pair of cylinders to move forks and mast.

control valve; shifts fork carriage side-to-side.

2. CONTROL LEVERS. Positions control valve spools,

5. LIFT CYLINDER. One used. Activated by control

in turn, allowing high pressure hydraulic oil to activate

valve. Two stage cylinder; raises or lowers fork carriage.

cylinders.

1-13