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 MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check if valves are worn out after long service.
Replace with new valves.
Step 4. Check for slow leak in suction line.
Tighten suction line at joints.
3. PUMP NOISY IN OPERATION.
Step 1. Check if strainer is clogged.
Clean strainer.
Step 2. Check if suction line is closed.
Open suction line.
Step 3. Check if pipes vibrate.
Support or cushion pipes.
4. PUMP STARTS AND STOPS TOO FREQUENTLY.
Step 1. Check for pressure switch operating properly.
Adjust switch.
5. PUMP MOTOR DEFECTIVE.
See troubleshooting on dc motors in group 05.
LUBRICATING OIL STANDBY PUMP.
1. PUMP LEAKS AROUND SHAFT.
Step 1. Check for leaking packing gland or worn packing.
Tighten or replace packing.
2. PUMP DOES NOT DISCHARGE AFTER RUNNING 1 MINUTE.
Step 1. Check if pump is airbound,
Prime pump.
Step 2. Check for leak in suction pipe.
Inspect lube oil system; repair leaks.
Step 3. Check if valves in system are properly aligned.
Align valves (para. 2-13).
3. PUMP MOTOR
See troubleshooting on dc motors in group 05.
FRESH AND SALT WATER STANDBY PUMPS
1. PUMP DOES NOT DISCHARGE AFTER RUNNING 1 MINUTE.
Step 1. Check for insufficient supply of fresh, or salt water.
Check fresh water expansion tank, and piping. tank should be at least half full at all times.
Check inlet on sea chest for salt water supply.
Step 2. Check for leaks in suction pipe.
Inspect water systems: repair leaks.
Step 3. Check that valves in system are properly aligned.
Align valves (para. 2-24).
Step 4. Check if pump is airbound.
Prime pump.
2. PUMP MOTOR.
See troubleshooting on dc motors in group 05.
3. EXCESSIVE VIBRATION.
Step 1. Check if pump out of alignment.
Realign pump.
Step 2. Check for worn bearing. Mounting foundation is loose.
Replace bearings. Secure mounting.
09 GROUP-PNEUMATIC EQUIPMENT.
AIR COMPRESSOR
1. AIR PRESSURE BELOW 230 PSI. MOTOR RUNNING.
Step 1. Check that compressor #1 Is operating.
Reduce load. or start compressor #2.
Step 2. Check that pressure switch is serviceable.
Test switch against opposite compressor gage.
Step 3. Check for leak in lines.
Test joints A with a soapy solution and watch for bubbles. Tighten loose connections.
Step 4. Check for loose drive belt.
Adjust drive belt.
2. MOTOR HAS TROUBLE TURNING COMIPRESSOR.
Step 1. Check that centrifugal unloader is operating.
Repair or replace unloader (para. 5-56).
Step 2. Check for stuck piston. or restriction in lines to tanks.
Replace piston (para. 5-56). Remove restriction from lines (para. 5-57).
Step 3. Check for weak motor.
See dc motor troubleshooting in group 05.
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