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PRECISION MACHINE TOOLS Ver 2 Maintenance Manual
3-6 Air Compressor Unit Troubleshooting
Problem Cause Correction
Reduced pressure source
output
Blocked filter Clean the filter
Gas leakage
1. Loosened nut
2. Broken O-ring
3. Broken tube
1. Tighten the nut
2. Replace the o-ring
3. Replace the tube
Disfunctional pressure
regulator
Broken pressure regulator
1. Broken spring of the
pressure regulator
2. Broken spring of the valve
3. Dust or dirts on the base of
the valve
4. Broken lining of the valve
5. Broken film
1. Replace the spring
2. Replace the spring
3. Clean the valve and the
base
4. Replace the valve
5. Replace the film
Output side air pressure low
1. Dust on the valve base
2. Broken inner lining rubber
3. Broken valve spring
1. Clean the valve and the
valve base
2. Replace the valve
3. Replace the spring
Gas leakage at the screw cap
1. Loosened cap nut
2. Broken film
1. Tighten the cap nut
2. Replace the film
No oil dripped from the oil cup
1. The adjusting needle being
too tight
2. The adjusting needle
cannot be closed or there
are dirts on the needle. The
adjustment needle cannot
bear the pressure
3. Broken or damaged
adjusting needle or needle
base
1. Loosen up the needle
2. Reduce the oil volume until
the level reaches the
maximum oil level
3. Add more oil until the level
reaches between the
maximum and the
minimum level
4. Clean up the blockage
The oil volume cannot be
adjusted
1. The adjustment needle is
too loose
2. The adjustment needle
cannot be closed or dirt on
the needle. The adjusting
needle cannot bear the
pressure
3. Broken or damaged
adjustment needle or
needle base
1. Tighteen the needle and
gradually loosen it for
adjustment
2. Remove the dirt
3. Partial replacement
Oil leadkage at the adjustment
needle
1. The needle is too loose
2. Broken O-ring
1. Tighten up the adjustment
needle
2. Replace the O-ring
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