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Table 2-2. Troubleshooting - TM-10-3930-618-200040
TM-10-3930-618-20 Truck Lift Fork; Gasoline Engine Driven; Pneumatic Tired Wheels; 6 000 lb. Capacity; 168 Inch Lift Manual
Table 2-2. Troubleshooting - continued - TM-10-3930-618-200042
Table 2-2. Troubleshooting (Cont'd)
Probable cause
Corrective action
i. Remove obstructions or replace parts
i. Exhaust pipe. muffler or tailpipe obstructed.
j. Report to direct support maintenance.
j. Low compression, broken valve springs,
sticking valves
k. Adjust tappets (para 2-8).
k. Improper tappet adjustment.
l. Clean filter. inspect fuel pump, inspect
l. Lack of fuel.
carburetor for water or dirt, and replace if
a. Adjust governor (para 2-19).
a. High engine speeds.
13. High oil consumption.
b. Report to direct support maintenance.
b. Oil leak.
c. Use new oil of proper grade.
c. Improper grade of oil or diluted oil.
d. overheating of engine causing thinning of oil.
d. See "engine overheats," item 24 below.
e. Report to direct support maintenance.
e. Defective piston or rings; excessive side
clearance of intake valves in guides; cylinder bores
worn (scored, out-of-round, tapered); worn or
damaged seals.
a. Fill crankcase to prescribed level.
a. Insufficient oil supply.
14. Low engine oil pressure.
b. Change oil, inspect crankcase ventilation,
b. Improper grade of oil or diluted
and inspect for water in oil.
c. Change to proper grade of oil Refer to
c. Oil too heavy.
Lubrication Chart.
d. Report to direct support maintenance.
d. Oil leaks.
e. Report to direct support maintenance.
e. Oil pump faulty; pressure regulator valve
stuck or improperly adjusted, or broken spring.
a. Adjust tappets (para 2-8).
a. Incorrect tappet adjustment.
15. Poor engine compression.
b. Report to direct support maintenance.
b. Leaking, sticking or burned valves; sticking
tappets; valve spring weak or broken; valve stems
and guides worn; piston ring grooves worn or rings
worn, broken or stuck cylinder bores scored or
a. Fill fuel tank.
a. No fuel in fuel tank.
16. Fuel does not reach carburetor.
b. Replace filter cartridge (para 2-18).
b. Fuel filter clogged.
c. Repair or replace line.
c. Fuel line air leak between tank and fuel
d. Disconnect and blow out lines.
d. Fuel line clogged.
e. Clean vent.
e. Fuel tank cap vent clogged.
f. Replace pump (para 2-18).
f. Fuel pump defective.
a. Adjust choke control.
a. Choke not closing.
17. Fuel reaches carburetor, but does not
b. Replace carburetor (pars 2-17).
b. Fuel passage in carburetor clogged.
reach cylinders.
c. Replace carburetor (para 2-17).
c. Carburetor float valve stuck closed.
a. Adjust carburetor (para 2-17).
a. Incorrect adjustment of carburetor.
18. High fuel consumption.
b. Reduce -loads to specified minimum
b. Vehicle overloaded.
c. Adjust governor (para 2-19).
c. High engine speeds.
d. Clean air cleaner and change oil in cup
d. Air cleaner clogged.
e. Replace carburetor (para 2-17).
e. Carburetor float level too high; acceleration
pump not properly adjusted.
Correct leaks, replace lines.
f. Fuel line leak.
See "Engine Overheats," item 24 below.
g. Overheating engine.
Replace carburetor (para 2-17).
h. Carburetor parts worn or broken.
Replace fuel pump (para 2-18)
i. Fuel pump pressure too high or diaphragm
j. Inspect thermostat (para 2-28).
j. Engine runs cold.
k. Reset timing (para 2-14).
k. Ignition incorrectly timed.
l. Replace distributor (para 2-34).
l. Spark advance stuck.
m. Replace gasket (para 2-18).
m. Leaking fuel filter bowl gasket.
n. Report to direct support maintenance
n. Low engine compression.
o. Adjust choke control.
o. Choke partially closed.
p. Adjust carburetor idle speed (para 2-17).
p. Engine idling too fast.
q. Clean and gap or replace spark plugs
q. Spark plug dirty.
r. Replace coil (para 2-36).
r. Weak coil.
s. Remove obstruction or replace, defective
s. Clogged muffler or bent exhaust pipe.

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