TM 5-4310-349-14
Table 4-2. Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Before you see this Table, be sure you have performed all operating checks
1.
COMPRESSOR PUMPING OIL
Step 1. Check for a leaking release valve.
Replace a leaking release valve (para 4-14).
Step 2. Check for a hot cylinder head. If one seems hotter than the other, there could be damaged rings on piston.
Notify direct support maintenance.
2.
KNOCKS OR RATTLES
Step 1. Check for loose belt wheel or motor pulley.
Replace motor if pulley is loose (para 4-11).
Step 2. Check for leaking release valve or restrictions in piping system.
Replace a leaking release valve. Replace restricted piping (para 4-14).
3.
AIR DELIVERY DROPPING
Step 1. Check for air leaks in piping.
Make a soapy solution with warm water. Paint on fittings and watch for signs of air leaks. Replace leaking fittings, if
tightening does not stop the bubbles. (para 4-16).
Step 2. Check for a leaking release valve.
Replace a defective release valve (para 4-14).
Step 3. Check for restricted air passages or leaking or broken valves.
Notify Direct Support Maintenance.
4.
MOTOR OVERLOAD RELAY TRIPS
Step 1. Check line voltage, or motor terminals loose connections, or defective starter heaters.
Notify Direct Support Maintenance.
5.
EXCESSIVE STARTING OR STOPPING
Step 1. Check receiver for condensate.
Drain the condensate (para 3-10)
Step 2. Check for air leaks in piping or receiver check valve leaking.
Repeat Step 1. in Paragraph 3 above.
Step 3. Check for leaking, broken, or worn pressure switch (fig. 1-2)
Notify Direct Support Maintenance.
6.
COMPRESSOR RUNNING HOT
Step 1. Check that air passage is not blocked at fan wheel.
Move any foreign object that may block ventilation.
Step 2. Test for a leaking check valve (para 4-16).
Replace a defective check. valve.
7.
COMPRESSOR RUNNING SLOW
Step 1. Check for low line voltage or a defective motor starter heater.
Tighten loose terminals. If still running slow, notify Direct Support Maintenance.
Step 2. Check for leaking release valve.
Tighten leaking fittings.
8.
LIGHTS FLICKER WHEN COMPRESSOR RUNS.
Check terminals of motor.
If bad connections cannot be rectified, notify Direct Support Maintenance.
Section VI. MAINTENANCE OF THE ELECTRIC MOTOR AND COMPRESSOR
the V-belt guard, belts, and aftercooler tube are
4-10.
General
removed.
The electric motor can be removed from the air
receiver tank as a unit after removal of the V-belt guard,
4-11. Electric Motor
belts, conduit, and mounting brackets.
The air
a. Removal.
Remove the electric motor as
compressor assembly can be removed as a unit after
instructed on figure 4-4.
4-6
