TM
9-4940-549-14&P
Table 4-2. Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
Motor Overload Relay Trips.
Step 1.
Check line voltage.
Tighten loose connections. Replace defective fuses (para. 18-3).
Check for leaking, broken, or carbonized valves, or restricted
Step 2.
air passages.
Remove restrictions from air passages (para. 14-11).
Excessive Starting or Stopping.
5.
Step 1.
Check the receiver check valve for defects.
Remove any dirt, dust, or blockage from seat. Replace defective
check valve (para. 14-6).
Step 2.
Check pressure switch for wear.
Replace defective pressure switch (para. 14-4).
6.
Compressor Running Hot.
Step 1.
Check for blockage of air to fanwheel.
Remove any restriction to flow of air.
Step 2.
Check for defective check valve in receiver.
Clean or replace check valve as necessary.
Check for leaking, broken, carbonized, or loose valves.
Step 3.
Clean or replace valves as necessary (para. 14-11).
7.
Compressor Running Slow.
Check for low line voltage or a defective starter heater.
Tighten loose connections.
Replace a defective motor starter or
heater (para. 14-8).
4-35
