© Glenco Air & Power Pty Ltd
Table 8.1
Troubleshooting Chart
pumping mode and unloading
or off mode.
when air demand is at 50%
of compressor output.
2. Air leaks.
3. Excessive condensate in air
decreased or increased
compressed air demand.
2. Tighten, refit or replace
leaking connections or
components.
3. Drain air receiver tank.
Excessive oil in discharge air.
1. Blocked or dirty inlet air
filters.
2. Overfilled with oil.
3. Low oil viscosity.
4. Excessive duty cycle.
5. Blocked or damaged
crankcase breather.
6. Damaged or worn intake
valves, piston rings, pistons
1. Clean or replace air filter
elements.
2. Drain oil down to high level
mark.
3. Replace with correct oil.
4. Reduce air demand or use
larger or additional
compressor(s).
5. Clean or replace crankcase
breather.
6. Replace components or
entire compressor pump.
1. No fault. This is normal
operation. Condensate
quantity will increase with
duty cycle and humidity.
1. Install dryer or filter in
discharge line. Install
automatic tank drain valve
or manually drain air tank
more often. Revise
distribution piping system
to ensure proper
Compressor does not switch
off and safety valve discharges.
1. Faulty or incorrectly set
pressure switch or pilot
valve.
2. Faulty safety valve.
3. Note: Use tank pressure
gauge to help diagnose
1. Adjust or replace pressure
switch or pilot valve.
2. Replace safety valve.
Low suction or air blowing out
at air filter inlets during
pumping mode.
compressor pump inlet
valves or blown cylinder
head gaskets.
2. Head unloaders not fully
retracting (usually
indicated by air blowing
out from air filter inlets).
1. Replace compressor pump
inlet valves or cylinder
head gaskets.
2. Repair or replace head
unloaders.
No short discharge of air from
the pressure switch after
reaching cut-out pressure or
being manually switched off.
1. Faulty pressure switch
unloader valve.
2. Blocked or damaged
1. Replace unloader valve or
complete pressure switch.
2. Clean or replace unloading
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