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Malfunction
corrective Action
Probable cause
b. Replace gear and pinion (para
b. W orn ring gear or pinion.
4-6).
a. Check system for leaks and repair
26. Pedal goes to toe plate.
a. External leak in brake system or
(para 4-111.
leak part master cylinder piston
cup.
a. Clean system, replace cups in
a. Mineral oil in brake system.
27. Both brakes drag.
brake cylinders. and refill system
with brake fluid (para 4-12).
b.
Clean out breather port (para
b. Breather port in master cylinder
4-11.
clogged.
a.
Remove obstruction or replace
28. One wheel drags.
a. Obrtruction in brake line.
line.
b.
Replace defective or damaged
b. Swollen wheel cylinder piston cups
parts (para 4-12).
or piston binding.
a.
Replace tires (para 4-16).
29. Truck pulls to one ride.
a. Uneven tread wear.
b.
Repair or replace drum (para
b. Drum scored.
4.15).
a.
Replace damaged part (para 3-12
30. Loss of coolant.
a. Cracked engine block or head.
and 3-18).
b.
Replace (para 3.12).
b.
Defective herd gasket.
c.
Repair or replace (para 3-10).
c.
Leaking radiator.
d.
Close or tighten drain cocks.
d.
Drain cocks loose or open.
a.
Replace inoperative unit.
a.
Defective instrument panel gage
31. Temperature gage indicates
excessive operating temperature.
or sending unit.
b.
Clean the radiator.
b.
Surface or radiator core clogged.
c.
Clean out cooling system.
c.
Obstruction in cooling system.
d.
Repair.
d.
Leak in cooling system.
a.
Adjust or replace fan.
32. Rapid wear or breakage of fan
a.
Fan blades striking belt.
b.
Check alternator bearings (para.
belt.
b.
Exceenive drag from alternator.
5-2).
c.
Replace pulleys.
c.
Broken or
rough pulleys.
a.
Repair or replace fan.
33. Fan or pump noisy.
a.
Loose fan
blades.
b.
Tighten.
b.
Loose fan
hub.
a.
Repair or replace wiring.
34. Ammeter reading Zero with
a.
Broken or
loose wiring at ignition
ignition switch ON and engine
switch.
turning.
a. Repair or replace windings (para
a. Defective stator.
35. Ammeter does not show charge.
3-2).
b. Replace brushes (para 3-2).
b. W orn alternator brushes.
c. Repair or replace armature (para
c. Shorted alternator armature.
5-2).
d. Replace (para 5-2).
d. Defective rectifying diodes in
alternator.
e. Repair or replace field coils (para
e. Shorted alternator fields.
5.2).
a. Trace wiring for aborts.
a. Shorted circuits.
36. Ammeter shows heavy discharge
with engine stopped.
a. Trace wiring for breaks or
a. Shorted or loose) connections.
37. Ammeter show, rapid fluc-
looseness.
tuation.
b. Clean and tighten brushes.
b. Dirty, loose, or worn alternator
Replace if worn (para 5-2).
brushes.
c. Repair or replace (para 5-2).
c. Defective alternator.
a. Reconnect or replace wires.
a. Broken connections.
38. Starting motor failure.
b. Clean (para 5-3).
b. Commutator dirty.
c. Replace (para 5-3).
c. Worn brushes.
d. Replace (para 5-3).
d. Broken drive.
c. Replace ring gear (para 3-14).
e. Bad teeth on flywheel.
a. Check for faulty ground or replace
a. Faulty horn button.
39. Horn does not blow.
horn button (para 4.18).
a. Eliminate ground.  C h e c k f o r
a. Grounded horn wire.
40. Horn blows continuously.
frayed wire.
b. Replace (para 4-18).
b. Defective horn button.
a. Replace or recondition (para 5-5).
a. Defective hydraulic pump.
41. Hard steering.
b. Replace spring.
b. Broken or weak relief valve
opting.
c. Free valve.
c. Binding relief valve.
2-5

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