Time required: 0.2
Time required: 0.4
Item to be inspected procedure
Always use cleaning solvent Fed Spec P-D-68O to wipe away oil 6r grease from the -compressor
frame, intercooler, or aftercooler. tubes.
Always wipe away oil-and-grease first, in order that power may be turned on and compressor air
used to remove dust from cylinder cooling finns, and cooling tubes.
Use cleaning solvent Fed. Spec. P-D-680 to remove excess oil or grease from the compressor, receiver, or belt guard
assembly. Then use-blasts of air to remove dust and dirt from the assembly.
CHECK THE FRAME OIL LEVEL AND DRAIN CONDENSATE FROM AIR RECEIVER
Inspect oil level. Fill to the overflow point if necessary. Open draincock at bottom of air receiver (fig. 1-1) long
enough to drain condensate, then close the draincock.
INSPECT HOSES AND FITTINGS
Inspect for leaks, or loose connections. Notify organizational maintenance of defective fittings.
SWITCHES AND CONTROLS
Check for loose -wires on switches, motor starter, or motor. Notify organizational maintenance of -defect.
Check for wear and proper tension of drive belts (para 3-7).
SAFETY RELIEF VALVE
Check for proper operation, by lifting lever (fig. 1-1) until air escapes.
Section III. TROUBLESHOOTING
a. This section contains troubleshooting information,
TEST OR INSPECTION
for locating and correcting most of the trouble that may
develop in the air compressor. Each malfunction for an
individual component is followed .-by a -list-of test or
Step 3. Check for leaking or maladjusted pilot valve. Adjust pilot
inspections which will help you to determine probable
causes and corrective actions to take. You should
KNOCKS OR RATTLES.
perform' the test/inspections and corrective actions in the
Step 1. Check for loose belt pulley, or motor with
excessive end play in shaft. Notify organizational
b. This manual cannot list all malfunctions that may
Step 2. Check for leaking valves, or restricted air
occur, nor all tests or inspections and corrective actions.
Notify organizational maintenance.
If a malfunction is not-listed or is not corrected by listed
AIR DELIVERY DROPPING.
corrective action, notify your Supervisor.
Step 1. Check for clogged inlet filter. Service the
Step 2. Check for air leaks in piping. Make a
solution of soapy water and apply at fittings. If
Refer to Table 3-3 below for malfunctions, test or
leak is found, notify organizational maintenance.
Step 3. Check for leaking or maladjusted pilot
inspection and corrective actions.
leaking, notify organizational maintenance.
Table 3-3. Troubleshooting
MOTOR OVERLOAD RELAY TRIPS.
Step 1. Check compressor. frame for proper
TEST OR INSPECTION
Step 2. Check V-belts for too tight adjustment.
Step 3. Check for leaking or maladjusted pilot valve.
Before you use this Table, be sure you have
performed all applicable operating checks.
EXCESSIVE STARTING AND STOPPING.
Step 1. Check the receiver drain.
COMPRESSOR PUMPING OIL.
Step 1. Check for a clogged intake filter. Service
Step 2. Check for air leaks in piping.
Repeat Step 2 of Paragraph 3 above.
Step 2. (Check for low oil level (LO 5-4310-348-12). Fill with