10. MAINTENANCE AND TROUBLESHOOTING
– 16 –
Thermal overload protector
cuts out repeatedly.
1. Low voltage.
1. Eliminate extension cord,
check with voltmeter.
2. Clogged air filter.
2. Clean filter (see
maintenance section).
3. Lack of proper ventilation/
room temperature too
high.
3. Move compressor to well
ventilated area.
4. Check valve malfunction.
4. Replace.
5. Compressor valves failed.
5. Replace valve assembly.
Danger! Do not
disassemble check valve
with air in tank – bleed tank.
Knocks, rattles, excessive
vibration.
1. Loose bolts, tank not
level.
1. Tighten bolts, shim tank to
level position.
2. Defective bearing on
eccentric or motor shaft.
2. Replace.
3. Cylinder or piston ring is
worn or scored.
3. Replace or repair as
necessary.
Tank pressure drops when
compressor shuts off.
1. Loose drain cock.
1. Tighten.
2. Check valve leaking.
2. Disassemble check valve
assembly, clean or
replace.
3. Loose connections at
pressure switch or
regulator.
3. Check all connections
with soap and water
solution and tighten.
Compressor runs
continuously and air output
is lower than normal/low
discharge pressure.
1. Excessive air usage,
compressor too small.
1. Decrease usage or
purchase unit with higher
air delivery (SCFM).
2. Clogged intake filter.
2. Clean or replace.
3. Air leaks in piping (on
machine or in outside
system).
3. Replace leaking
components or tighten as
necessary.
4. Broken inlet valves.
4. Replace compressor
valves.
5. Piston ring worn.
5. Replace piston and
cylinder.