TM 5-3895-374-24-2
SECTION V
TROUBLE GUIDE
TROUBLE
CHECK POINT NUMBERS
Oil in discharge air .............................................................................................................................. 1-7-9-11-17-22-23
Knocks or rattles ................................................................................................................................. 2-18-19-20-21-23
Air delivery has dropped off ................................................................................................................ 1-5-17-18-23-26
Intercooler safety valve pops .............................................................................................................. 6-18-19-26
Trips motor overload or draws excessive current ............................................................................... 8-13-14-15-16-17-18-20-21-23
Water in frame or rusting in cylinders ................................................................................................. 11-12
Machine won’t unload ......................................................................................................................... 19
Auxiliary valve chatters, leaks around stem......................................... ............................................... 19
Excessive starting and stopping (auto start) ....................................................................................... 3-5-6-13
Compressor doesn’t unload when stopped ....................................... ................................................. 17
Compressor runs excessively hot ....................................................................................................... 4-6-10-18-24
Compressor won’t come up to speed............................................. .................................................... 6-14-17
Lights flicker when compressor runs............................................. ..................................................... 14-15
Abnormal piston, ring or cylinder wear............................................. .................................................. 10-11-22-25
CHECK POINT NUMBERS
TROUBLE CAUSE
1............................. Clogged intake filter/silencer(s).
2..............................Loose belt wheel or motor pulley or motor with excessive end play in shaft.
3..............................Receiver needs draining.
4..............................Air to fan wheel blocked off.
5..............................Air leaks in piping. (on machine or in outside syst em)
6..............................High pressure discharge valve leaking.
7..............................Oil viscosity too low.
8..............................Oil viscosity too high.
9..............................Oil level too high.
10............................Oil level too low.
11............................Detergent type oil being used. Change to non-detergent type with rust and oxidation inhibitor.
12............................Extremely light duty or located in a damp humid spot.
13............................Change to constant speed control due to steady demand.
14............................Check line voltage, motor terminals for good contact, tight starter connections, proper starter heaters,
fuses, wire size.
15............................Poor power regulation (unbalanced line). Consult with power company.
16............................V-Belts pulled excessively tight.
17............................Leaking or maladjusted centrifugal pilot valve, or defective O-Ring on pilot valve.
18............................Leaking, broken, or loose valves.
19............................Leaking, broken or worn inlet unloader parts. Aux. valve dirty, seats worn.
20............................Worn or scored connecting rod, piston pin or crank pin bearings.
21............................Defective ball bearing on crankshaft or on motor shaft. Loose motor fan. Loose bearing spacer
on crankshaft.
22............................Oil control ring broken or not seated in, stuck in groove, rough, scratched, or excessive end gap.
23............................Cylinders or piston rings scratched, worn or scored.
24............................Wrong direction of rotation.
25............................Extremely dusty atmosphere. Need more effective air inlet muffler and cleaner.
26............................Defective safety valve.
27............................High press inlet valve leaking.
28............................Oil seal worn or shaft scored.
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