OPERATIONAL CHECKOUT

TM 10-3930-623-12

2. Check that oil pressure is steady at between 20

3-11. OPERATIONAL CHECKOUT.

and 30 pounds at and above a fast idle speed, and

3-12. STEERING GEAR. Start engine and check for

remains above seven pounds at normal slow idle speed.

satisfactory operation of power steering system.

3. Listen for any unusual sounds indicating a

3 13. LIGHTS.

Turn on ignition switch and check

malfunction or potential trouble.

operation of stop light by pressing brake pedal. Turn on

spotlight; taillight should light at the same time.

3-16. TRANSMISSION.

OPERATE TRUCK IN

FORWARD AND REVERSE DIRECTIONS, CHECKING

3-14. CHARGING SYSTEM. Start engine and operate

FOR SATISFACTORY PERFORMANCE.

CHECK

at fast idle of 1000 to 1200 rpm. Ammeter should at first

THAT INCHING VALVE IS FULLY CLOSED WHEN

indicate a high (up to 20 amperes) rate of charge,

BRAKES ARE RELEASED TO ASSURE FULL

gradually decreasing as the battery is recharged to near

APPLICATION OF CLUTCHES. IF VALVE IS NOT

zero charging rate.

FULLY CLOSED, ADJUST AS FOLLOWS:

3-15. ENGINE. Check engine as follows:

1. ADJUST PEDAL STOP TO WHERE BRAKE ARM

1/8 INCH UNDERNEATH FLOOR BOARD.

1. Run engine until stable oper ating temperature is

reached (about 180 degree F).

2. ADJUST INCHING VALVE ADJUSTING SCREW

UNTIL PEDAL ARM DOES NOT RETURN TO FULL

STOP REST POSITION.

3. ADJUST PEDAL STOP ADJUSTING SCREW

APPROXIMATELY 3/4 TO ONE TURN LONGER SO

THAT PEDAL WILL NOT REST ON INCHING VALVE

OR CAUSE IMPROPER PRESSURE.

4. APPLY SUFFICIENT BRAKING PRESSURE TO

PEDAL AND ADJUST MASTER CYLINDER PUSH ROD

TO POSITION INCHING VALVE in THE FULL

EXTENDED POSITION.

TIGHTEN ALL LOCK NUTS.

3-17. HYDRAULIC SYSTEM. With a substantial load

hoisted on the forks, operate tilt cylinders to tilt upright

through full fore and aft range. Raise and lower the

loaded fork through its full limit of travel. Observe for

any malfunctioning at any stage of operation. With. load

raised and control in neutral position, check for any

creep-down of the loaded fork. After test, inspect

hydraulic system for leaks.

3-3/4