Appendix
11 --- 75
11.3.4 Oil leaks out of air filter
Possible cause: Remedy:
Oil level in separator tank is too high. Drain oil to correct level.
Inlet valve faulty. Find the fault and replace the defective
part.
11.3.5 Full--load/Idle sequence occurs too frequently (short cycles)
Possible cause: Remedy:
Receiver tank size is too small or there
is no tank.
Consult authorized KAESER distributor
for recommended tank size.
Diameter of hose connecting the unit
to the receiver tank is too small.
Connecting hose diameter should not
be smaller than the air discharge pipe
diameter. Install larger hose if neces-
sary.
Minimum pressure check valve leaks. Check the valve and replace defective
parts.
Flow is restricted at discharge. Look for plugged filters, partially
closed valves, frozen pipes or malfunc-
tioning pressure regulators.
11.3.6 Safety relief valve blows off
Possible cause: Remedy:
System does not discharge at idle. Make sure ball valve in vent line is
open. Check the control lines, inlet
valve and combined control/vent valve.
Replace defective parts as needed.
Oil separator cartridge is contamina-
ted.
Check the cartridge pressure differen-
tial and replace cartridge if necessary.
Minimum pressure check valve does
not open.
Check the valve for blockage and re-
place defective parts as necessary.
Safety relief valve not properly sized
for the pressure of the compressor
unit.
Check blow---off pressure and com-
pare to name plate of the compressor.
Replace if necessary.
11.3.7 Oil inside the unit
Possible cause: Remedy:
Socket is still in the hose coupling at
the separator tank.
Remove the socket from the coupling.
Safety valve has blown off. See chapter 11.3.5.
Oil is coming out of air filter. See chapter 11.3.4.
Hose coupling on separator tank is
loose.
Tighten coupling or replace as
needed.
Oil cooler leaks. Replace oil cooler.
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