Ref Symptom
Cause
(Level 1)
Cause
(Level 2)
Diagnosis
Cause
(Level 3)
Action
Separator
flooded with oil
Read pressure gauge. If 1
bar, remove separator cap
and bottle and examine.
Oil return
restrictors
blocked
Replace separator and
return restrictors
2.9
Rotor blades
not extended
Blades stuck in
rotor
Compressor will run very
quietly without producing
air and no air will be
sucked in through inlet.
Oil too thick Check/replaceoil
Remove intake end cover
to inspect condition of
rotor and blades.
Blades seized Free blades/slots
2.10
Internal air
leaks in
compressor
Shim breakdown
Dismantle compressor to
examine rotor/stator unit.
Check temperature, flow
and power.
Replace stator shims
C
High temperature
3.1 Oil level low Incorrectly filled
Check sight glass with
machine stopped and
depressurised.
Drain and replace oil to
overflow
Oil leaks
Visually check for external
oil.
Repair leaks, drain and
new oil
Oil carryover
Check downstream
equipment for signs of oil
contamination.
See D
3.2
Dirty/blocked
cooler matrix
Visually examine cooler
matrix for excessive dirt.
Clean cooler, drain and
new oil
3.3
Thermal
bypass failure
Damaged
thermal motor
Remove thermal motor
and examine. If wax has
leaked or piston rod is
loose, it is rejected. Check
function of piston in hot
water @ 90°C.
Replace thermal motor,
drain and new oil
3.4
Dirty/blocked
Oil filter
Oil
contamination
Remove filter and visually
check condition.
Drain oil, clean filter, fill
with fresh oil.
3.5 Incorrect oil Service error
Remove sample and
compare with correct oil or
check source.
Drain, flush, drain, fill with
fresh oil.
3.6
Internal air
leakage
Damaged shims
Dismantle compressor to
examine rotor/stator unit.
Dismantle and replace
3.7
Blocked
internal oil
passageways
Hydrocarbon
deposits
Dismantle compressor to
examine oil passageways.
High
temperature oil
Dismantle, clean and
rebuild
D
Excessive oil consumption
4.1 Oil leaks
Visually check for external
oil.
Identify source and rectify
4.2
Compressor
running at
Minimum
pressure
Fit pressure gauge in test
point and check internal
running pressure.
Excessive air
demand
Rectify system leaks
4.3 Incorrect oil Service error
Remove sample and
compare with correct oil or
check source.
Drain, flush, drain, fill with
fresh oil.
4.4 Oil carryover
Flooded or
broken
separators
Check downstream
equipment for signs of oil
contamination. Remove oil
return restrictor plugs and
check if blocked.
If restrictor plugs are
blocked, remove and
replace separator
elements and oil return
restrictors.
Page 93
Fault Finding 6
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