Table 4-1. Preventive Maintenance Checks and Services

TM 10-3930-627-12

Organizational Maintenance Category

250 Hour Schedule

Sequence

Item to be inspected

Procedure

Paragraph

No.

references

Drive belt

Proper adjustment is full deflection midway between pulleys.

4-30

Replace a worn, cracked or frayed belt.

Spark plugs

4-36

Replace spark plugs that have cracked insulators or burned

electrodes. Clean and set spark plug gaps for 0.025 inch.

Torque spark plugs to 25 to 30 foot-pounds. Replace leads

that are frayed or broken. Clean and tighten lead

connections.

Distributor

4-35

Replace pitted or burned contact points. Proper gap adjustment

is 0.022 inch. (Check adjustment every 500 hours}.

Fire Extinguisher

Inspect for broken seal. The dry chemical type must be weighed

every 6 months. If the weight has decreased to less than that

specified on cylinder or the pressure is below 125 psi the

extinguisher must be replaced.

Tilt cylinder

4-54

Check for leaks and insecure mounting. Replace a defective

cylinder. Adjust as necessary.

Lights

Check for burned out lamps or defective leads. Replace

defective lamps or leads.

Lift chains

4-55

Inspect for cracked, broken or worn links. Replace a defective

chain. Adjust as necessary. Reference current L.O.

Lift cylinder

Inspect for leaks and insecure mounting. Refer discrepancies to

direct support.

Controls and Instruments Inspect for damage and loose mounting. With unit operating,

2-7

3-3

check for proper operation.

Brake and Inching pedal Check for strong pressure when brake pedal is applied. Proper

4-43

pedal free travel is 3/8 to 5/8 inch. Bleed brakes if necessary.

Inspect cylinder and lines for leaks. Add fluid as required.

Master cylinder

4-42

Reference current LO. Clean fill plug vent. Replace a

defective cylinder or leaking line.

Inspect operation. Adjust as necessary.

Handbrake

4-41

Add fuel as required. Tighten loose mounting. Replace leaking

Fuel tank

4-25

fuel tank. Replace defective cap gasket. Clean cap vent.

Clean fuel pump strainer screen. Install new gasket.

Fuel Strainer

4-26

Tighten loose cables and mountings. Remove corrosion. Fill to

Battery

3-7

3/8 inch above the plates. Clean venthole in filler cap before

4-33

installing. In freezing weather run engine minimum of 1 hour

after adding water. Replace a cracked or leaking battery.

Change oil and replace filter. Reference current LO.

Engine oil level gage

LO.

Proper coolant level is 1 inch below filler neck. Replace cracked

Radiator

3-7

or frayed hose. Replace defective radiator. Remove

obstructions in the air passages. Tighten all mounting and

leaking connections.

Lubricate in accordance with current LO.

Note. During operation observe for any unusual noise or

vibration.

4-2