Figure 5-2. Cylinder Head Tightening Sequence

TM 10-3930-623-12

back raises the forks to the extreme top of the upright

assembly. Slowly push lever forward and allow the forks

to bottom by gravity. If, in raising the hoist, the lever is

not returned to neutral when top is reached, the overload

bypass in the control valve will open automatically and

detour the flow of oil back to the reservoir tank. This

action is indicated by a buzzing sound which is normal.

Note if there is any tendency for channels to bind and be

sure there is complete freedom of the crosshead

assembly, both up and down. In testing of the tilt

operation, when lever marked TILT is pulled back to its

extreme, the forks should tilt up and back. When the

TILT lever is pushed forward, the forks should tilt out and

down. Both tilting actions are accomplished by hydraulic

pressure. Note any tendency fox either the hoist or tilt

action to hesitate or mush.

Figure 5-2. Cylinder Head Tightening Sequence

5-7.

WEEKLY INSPECTION.

Perform the daily

2. Check fan belt tension. At firm thumb pressure

inspection. In addition:

at center of the long span, belt should yield 3/4-inch

minimum and one-inch maximum. Adjust tension as

1. Remove the pleated paper air cleaner element.

necessary by repositioning IDLER BELT TENSION (Fig.

Clean it by tapping it lightly on floor, then carefully

6-8).

blowing surface dust from the exterior with compressed

air.

3. Check lubrication requirements (refer to LO

10-3930-623-12 )

CAUTION

5-8.

QUARTERLY PREVENTIVE MAINTENANCE

Do not blow high pressure airstream

SERVICES. Before this inspection, clean the truck,

at close range to the element. Do not

including the engine, transmission, drive and steering

wet the element for cleaning or any

axles and hoist mechanism, Use a steam cleaner or an

other reason.

approved type engine cleaning solution. After cleaning,

relubricate exposed parts of hoisting mechanism in

accordance with instructions LO 10-3930-623-12:

inspect according to table 5-3 and as follows:

1. Perform eight hour visual

and

operational

inspections, and weekly inspection.

2. Inspect all grease-fitting lubricated parts for

signs of wear.

3. Remove and inspect engine spark plugs. Clean

or replace, if necessary. Inspect condition of all ignition

wiring.

4. Remove distributor cap (but not wiring to cap).

Inspect interior for dirt accumulation or burned lines on

plastic surface.

5. Inspect distributor point gap, and condition of

points. If points are serviced (adjusted, cleaned, or

replaced), check ignition timing with a timing light.

5-9. ENGINE MAINTENANCE.

Figure 5-1. Tensioning Alternator Belt

5-2