CHAPTER 5
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE INSTRUCTIONS
Section I. REPAIR PARTS SPECIAL TOOLS AND EQUIPMENT
5-1. Special Tools and Equipment
5-2. Maintenance Repair Parts
There are no special tools, or equipment, required for
Repair parts and equipment covering direct and general
maintenance of the air compressor assembly.
support maintenance of the air compressor assembly are
listed and illustrated in TM 5-4310-348-24P
Section II. TROUBLESHOOTING
MALFUNCTION
5-3. General
TEST OR INSPECTION
a. This section contains troubleshooting information for
CORRECTIVE ACTION
locating and correcting most of the trouble that may
develop in the air compressor. Each malfunction for an
3.
AIR DELIVERY DROPPING.
individual component is followed by a list of tests or
Step 1. Check for leaking, broken, carbonized or loose
finger valves.
inspections which will help you determine probable
Tighten or clean leaking or carbonized
causes and corrective actions to take. You should
valves. Replace defective valves (para 6-6).
perform the tests/inspections and corrective actions in the
Step 2. Check for scratched, worn or scored cylinders
order listed.
or pistons.
Replace defective cylinder or piston
b. This manual cannot list all malfunctions that may
Step 3. Check for piston rings broken or not seated in.
occur, nor all tests or inspections and corrective actions.
Replace damaged piston rings (para 6-6).
If a malfunction is not listed or is not corrected by the
4.
MOTOR OVERLOAD RELAY TRIPS.
listed corrective action, notify your Supervisor.
Step 1. Check line voltage.
Tighten loose connections. Replace de-
5-4. Troubleshooting
fective fuses.
Step 2. Check for leaking, broken, or carbonized
Refer to table 5-1 below for malfunctions, tests or
valves, or restricted air passages.
inspections, and corrective actions.
Remove restriction from air passages. Re-
peat Step 1 of Paragraph 3 above.
Table 5-1. Troubleshooting
5.
EXCESSIVE STARTING OR STOPPING.
Step 1. Check the receiver check valve for defect.
MALFUNCTION
Remove check valve, disassemble and
TEST OR INSPECTION
blow any dirt, dust, or blockage from
CORRECTIVE ACTION
seat. Replace a defective check valve
Step 2. Check pressure switch for wear.
NOTE
Replace a defective pressure switch
Before you use this Table, be sure you have
(para 64).
performed all operating checks.
6.
COMPRESSOR RUNNING HOT.
1.
COMPRESSOR PUMPING OIL.
Step 1. Check for blockage of air to fanwheel.
Step 1. Check cylinders or piston for wear, scratches
Remove any restriction to flow of air to
or scoring.
fanwheel.
Replace defective cylinder or piston
Step 2. Check for defective check valve in receiver.
Repeat Step I of Paragraph 5 above.
Step 2. Check for piston rings broken, or not seated in.
Step 3. Check for leaking, broken, carbonized, or loose
Replace piston rings (para 6-6). .
valves.
2.
KNOCKS OR RATTLES.
Repeat Step 2 of Paragraph 4 above.
Step 1. Check for carbon on top of piston.
Step 4. Check for motor rotation.
Remove air heads and check piston
Look at directional arrow at upper left
of belt guard and see that belts are mov-
Step 2. Check for loose, broken, or carbonized air
ing in that direction.
finger valves.
7.
COMPRESSOR RUNNING SLOW.
Separate air heads from spacers and look
Step 1. Check for low line voltage, or a defective start-
finger valves over carefully (para 6-6).
er heater.
Replace defective finger valves (para 6-6).
Tighten loose connections. Replace a de-
Step 3. Check for worn or scored connecting rod,
fective motor starter or heater (para 6-3).
piston pin, or crank pin bushings.
Step 2. Check for leaking or maladjusted centrifugal
Replace defective parts (para 6-6).
unloader pilot valve.
Tighten a loose, leaking valve seat. Re-
place a defective valve (para 4-11).
5-1