Ref Symptom
Cause
(Level 1)
Cause
(Level 2)
Diagnosis
Cause
(Level 3)
Action
Leaking
bearing cap
gasket
Replace end cap gasket
Leaking
unloader valve
Replace unloader valve
seat
7.2
Faulty safety
valve
Worn spring
Read pressure gauge in
test point and check
internal pressure when
safety valve blows.
Replace safety valve
Damaged/worn
seating
Fit pressure gauge in test
point and check internal
pressure when safety
valve blows.
Replace safety valve
H
Slow/no ventdown
8.1
Automatic
Ventdown
orifice blocked
Listen for air loss into
intake area after stopping.
Fit pressure gauge in test
point to monitor vent down
of pressure.
Clean orifice plate
I
Motor overload or high power consumption
9.1
High pressure
setting
Fit pressure gauge in test
point and check internal
pressure.
Check/adjust servo
9.2
Compressor
overheating
Fit thermometer in oil filler
pocket and check
maximum temperature.
See C
9.3 Faulty motor
Check impedance of
motor windings.
Check motor
windings/bearings repair
or replace.
9.4
Seized blade in
slot
Listen for uneven popping
noise from compressor
under load. Remove intake
end cover to check
condition of blades.
Check/free/ replace blades
9.5
Compressor
rotor seizing
Rotor pushed
against intake
end cover
Remove compressor,
dismantle and examine
rotor and end cover.
Check setting of coupling.
Motor drive
coupling
incorrectly fitted
Replace damaged parts
Bearing seizing
Remove compressor,
dismantle and examine
rotor and bearings
Lubrication
failure
Replace damaged parts
Page 95
Fault Finding 6
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