Section IV. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
Because all required inspections must be made daily,
personnel will refer to table 4-1, for procedures to be
or more frequently, organizational maintenance
followed during their periodic inspection.
Table 4-1. Organizational Preventive Maintenance Checks and Services
Q-Quarterly
Total man-hours required: 0.7
Sequence
Item to be inspected
Work time
Number
Procedure
(M/H)
NOTE
Use Tables 3-1 and 3-2 for
preventive maintenance checks
and services, then return to this
0.8
Table for expansion of checks ad
1
services..
COMPRESSOR FRAME OIL
0.2
2
Refer to LO-5-431-348-12 for type, then drain
and change oil
CAPSCREWS, SCREWS AND BOLTS
Check that all capscrews, screws and bolts
are tight. Use a torque wrench and tighten to the
value shown in table 1-1.
0.3
Section V. TROUBLESHOOTING
4-5. General
Step 1. Check for loose belt wheel or motor pulley.
Replace motor if pulley is loose (para 3-8).
a. This section contains troubleshooting information
for locating and correcting most of the trouble that may
MALFUNCTION
develop in' the air compressor. Each malfunction for an
TEST OR INSPECTION
CORRECTIVE ACTION
individual component is followed by a list of tests or
inspections which will help you to determine probable
Step 2. Check for leaking pilot valve, or restrictions in piping
causes and corrective actions to take. You should perform
system. Rep leaking pilot valve. Replace restricted
the tests/inspections and corrective actions in the order
piping (para 4-11).
listed.
3.
AIRDELIVERY DROPPING
b. This manual cannot list all malfunctions that may
Step 1. Check for air leaks in piping. Make a soapy solution with
warm water. Paint on fittings and watch for signs of air
occur, nor all tests or inspections and corrective actions.
leaks. Replace leaking fittings, if tightening does not
If a malfunction is not listed or is not corrected by listed
stop the bubbles (para 4-13).
corrective acti6n, notify your supervisor.
Step 2. Check for a leaking pilot valve. Replace a defective pilot
valve (para 4-11).
Step 3. Check for restricted air passages, or leaking or broken
4-6. Troubleshooting
valves.
Refer to Table 4-2 below for malfunctions, tests, or
Notify Direct Support Maintenance.
inspections, and corrective actions.
4.
MOTOROVERLOAD RELAY TRIPS.
Step. 1. Check line voltage or motor terminals loose connections,
Table 4-2. Troubleshooting
or defective starter heaters. Notify Direct
Support Maintenance.
MALFUNCTION
5.
EXCESSIVE STARTING OR STOPPING':
TEST OR INSPECTION
Step 1. Check receiver for condensate. Drain the condensate
CORRECNVE ACTION
Step 2. Check for air leaks in piping, or receiver check valve
leaking.
NOTE
Repeat Step 1 in Paragraph 3 above.
Before you use this Table be sure you have
Step 3. Check for leaking, broken, or worn pressure
performed all operating checks.
switch (fig. 2-1).
1.
COMPRESSOR PUMPING OIL
Notify Direct Support Maintenance.
Step 1. Check for a leaking pilot valve.
6.
COMPRESSOR RUNNING HOT.
Replace a leaking pilot valve-(para4-11).
Step 1. Check that air passage is not blocked at fan wheel.
Step 2. Check for a hot cylinder head. If one seems
Move any foreign object that may block ventilation.
hotter than the other, there could be damaged
Step 2. Test for a leaking check valve (para 4-13).
rings on piston.. Notify direct support
Replace a defective check valve.
maintenance.
2.
KNOCKS OR RATTLES
4-2
