CompAir Limited
page 38
z Refer to the safety procedures before carrying
out any fault finding investigation on the
compressor unit.
WARNING
z Lethal voltages are used in this equipment.
Use extreme caution when carrying out
electrical checks. Isolate the power supply
before starting any maintenance work.
FAULT FINDING
Indication Possible Cause Remedy
Low oil pressure. (1) Low oil level. (1) Check/top up oil.
(2) Incorrect grade of oil in (2) Drain crankcase and refill with
crankcase. correct oil.
(3) Oil pump drive belt or pulley (3) Check drive belt and pulley.
loose. Rectify or renew as necessary.
(4) Oil pressure gauge faulty. (4) Check gauge calibration.
Renew gauge if defective.
(5) Incorrect setting of oil (5) Check setting of valve. If
pressure relief valve. necessary remove and clean
Ball valve sticking in valve assembly.
open position. Check seating. Reset valve.
(6) Clogged oil filter element. (6) Renew oil filter element.
(7) Broken or loose connections (7) Check condition of oil pipes
on oil pipework. and filter. Renew if necessary.
(8) Oil pump gears faulty. (8) Renew oil pump gears.
(9) Worn main bearings. (9) Inspect bearings and small
end bushes. Renew if necessary.
Compressor (1) Inadequate ventilation of (1) Check ventilation meets
overheating. compressor room. the recommendations in the
'Installation' section of this
manual.
(2) Incorrect positioning of (2) Check positioning meets
compressor or aftercooler. the recommendations in the
'Installation' section of this
manual.
(3) Valves faulty. (3) Remove valves. Inspect valve
plates, springs and seats.
Check condition of ring joints.
Renew as necessary .
(4) Intercooler passages (4) Clean intercooler internally and
obstructed (usually only externally.
after very long service).
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