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Table 2-2. Troubleshooting - continued - TM-10-3930-618-200041
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TM-10-3930-618-20 Truck Lift Fork; Gasoline Engine Driven; Pneumatic Tired Wheels; 6 000 lb. Capacity; 168 Inch Lift Manual
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Table 2-2. Troubleshooting - continued - TM-10-3930-618-200043
Table 2-2. Troubleshooting (Cont'd)
Probable cause
Malfunction
Corrective action
19. Low fuel pressure.
a. Air leak in fuel lines
a. Tighten connections, repair line if
damaged.
b. Fuel pump defective, diaphragm broken,
b. Replace furl pump (para 2-18).
valves leaking. linkage worn.
c. Fuel lines clogged
c. Clean or replace lines.
a. Improper carburetor throttle stop adjust-
20. Engine idles too fast.
a. Adjust idle speed adjustment screw (para
ment
b. Accelerator linkage sticking.
b. Free and lubricate linkage (para 2-20).
c. Accelerator linkage return spring weak
c. Replace spring (para 2-20)
21. Fuel gage does not register.
a. Loose wire connection at instrument panel or
a. Tighten connections.
tank unit.
b. Instrument panel unit or tank unit inoper-
b. Replace unit
ative.
22. Loss of coolant.
a. Loose hose connections.
a. Tighten hose connections.
b. Damaged or deteriorated hose.
b. Replace hoses.
c. Leaking radiator.
c. Replace radiator (para 2-25).
a. Thermostat sticking.
a. Replace thermostat and gasket (para
23. Engine too cool during operation
b. Low air temperature.
b. Cover radiator.
a. Air How through radiator core restricted
a. Clean radiator core from counterweight
24. Engine overheats.
side with compressed air or water (para 2-25).
b. Fill radiator to proper level (para 2-25).
b.
Coolant level low
c. Clean by Hushing radiator (para 2-25)
c.
Clogged radiator core.
d. Replace thermostat (para 2-28).
d.
Thermostat stuck.
e. Replace defective hose (para 2-25). Re-
e.
Damaged or deteriorated hose or fan belt
place defective fan belt (para 2-26).
f. Replace defective parts (para 2-25).
f.
Radiator or water pump leaking.
g. Adjust fan belt tension (para 2-26).
g.
Loose fan belt.
h. Report to direct support maintenance.
h.
Cylinder block or head leaking.
i. Reset timing (para 2-14).
i.
Ignition timing incorrect.
j. Replace defective parts (para 2-23).
j.
Damaged muffler; bent or clogged exhaust
pipe.
k. Refer to lubrication order.
k. Insufficient oil or improper grade of oil.
l. Clean air cleaner and change oil in cup
l. Air cleaner restricted.
m. Replace pump (para 2-27).
m. Water pump impeller broken
n. Report to direct support maintenance.
n. Poor compression.
o. Reset timing (para 2-14).
o. Timing incorrect.
a. Change to proper grade oil.
25.
Starting motor cranks engine slowly.
a. Engine oil too heavy.
b. Recharge or replace battery (pars 2-37).
b. Weak battery.
c. Battery cell shorted
c. Replace battery (para 2-37).
d. Battery connections corroded. broken or
d. Clean and tighten or replace cables.
shorted.
e. Replace starting motor (para 2-33)
e. Starting motor defective.
f. Replace switch.
f. Starting switch defective.
a. Engine oil too heavy.
a. Change to proper grade oil.
26.
Starting motor does not crank engine.
b. Starting motor solenoid or cables defective,  b. Replace defective starting motor (para
loose connections.
c. Starting motor pinion year jamming in fly-  c. Replace starting motor (para 2-33).
wheel drive gear.
d. Dirty starter drive mechanism.
d. Clean and lubricate mechanism.
e. Replace starter relay (para 2-33).
e. Faulty starter relay.
f. Faulty ignition switch.
f. Replace switch.
g. Faulty neutral starting switch.
g. Replace switch.
a. Starting motor gear not engage flywheel.
a. Replace starting motor (para 2-33).
27.
Starting motor operates but fails to
b. Starting motor or drive gear defective.
b. Replace starting motor (para 2-33).
crank engine when switch is engaged.
a. Regulator defective.
a. Adjust or replace regulator (para 2-32).
28.
No alternator output.
b. Alternator defective.
b. Adjust or replace alternator (para 2-31).
a. Loose fan belt.
29.
Low or fluctuating alternator output.
a. Adjust belt (para 2-26).
b. Loose or dirty connections in charging circuit.
b. Clean and tighten connections.
c. Replace alternator (para 2-31).
c. Defective alternator.
d. Defective regulator.
d. Adjust or replace regulator (para 2-32).
30.
Excessive alternator output.
a. Defective alternator.
a. Replace alternator (para 2-31).
b. Defective regulator.
b. Adjust or replace regulator (para 2-32).
2-6

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