ETQ A16 - Troubleshooting Common Issues

14
TROUBLESHOOTING
Symptom Probable cause Corrective Action
Low discharge
pressure.
1. Air demand exceeds
pump capacity.
2. Leaking air
3. Restricted air intake
4. Blown gaskets
5. Leaking or damaged
valves.
1. Decrease air demand or use a larger
capacity air compressor
2. Listen for high pitched escaping air. Apply
soap solution to all fittings and
connections. Bubbles will appear at points
of leakage. Tighten or replace leaking
fittings or connections.
3. Clean air filter element
4. Replace faulty gaskets.
5. Remove head and inspect for valve
breakage, misaligned valves, damaged
valve seats, etc. Replace defective parts
and reassemble.
Pump
overheating and
damaging air
filter.
1. Insulating gasket
between filter and
head is missing.
2. Broken valves blown
gasket.
1. Install gasket.
2. Replace valves or install new gasket.
Excessive noise
or abnormal
noise
1. Loose motor.
2. Low oil in crankcase
3. Worn connecting
rods
4. Worn piston pin
5. Piston hitting valve
plate.
6. Noisy check valve.
1. Tighten motor bolts.
2. Refill oil to the proper level. Also, if
always low, check for possible damage to
bearings or oil leaks
3. Replace connecting rod. Maintain oil level
and change oil more frequently.
4. Remove old piston pin, measure and verify
specifications are within limits. If not,
replace piston pin and replace oil more
frequently.
5. Remove the compressor head and valve
plate for carbon deposits or other foreign
objects. Replace the head and valve plate
and use a new gasket.
6. Replace.
Large quantities
of oil in air
supply
1. Worn piston rings.
2. Air intake clogged
3. Oil level in
compressor head to
high.
4. Wrong oil viscosity
1. Replace with new rings.
2. Clean air filter
3. Drain some of the oil.
4. Use SAE30
Water in 1. Water increases with 1. Drain tank daily.