page 39
V100-VL400 User Manual – Fault Finding
Indication Possible Cause Remedy
Compressor (5) Main delivery pipework (5) Remove pipework and inspect.
overheating (cont.) blocked or restricted. Rectify if necessary. Check that
bore is of adequate diameter.
(6) Faulty unloading (6) Check operation of unloader
(particularly on 2nd stage mechanism. Ensure that
cylinders). 1st stage unloader fork travels its full
temperature gauge reading distance to open suction valve
will increase when plate completely.
compressor is running
unloaded.
Compressor fails to (1) Incorrect setting of governor (1) Adjust settings to achieve
maintain working or pressure switch. correct pressure.
pressure. (2) Compressor air intake (2) Inspect air intake filter for
blocked or partially cleanliness and serviceability.
obstructed. Renew element if necessary.
(3) Faulty unloading preventing (3) Check operation of unloader
compressor from coming mechanism.
on load.
(4) Valves faulty. (4) Remove valves. Inspect valve
plates, springs and seats.
Check condition of ring joints.
Renew as necessary.
(5) Leaks in user's pipework. (5) Check for leaks.
(6) The air demand of the (6) Check compressor is in good
installation exceeds the condition. (A slow fall in delivery
rating of the compressor. pressure when running on full
load indicates that the
compressor is not large enough
for the installation).
(7) Compressor running under (7) Check drive motor speed.
speed. Rectify as necessary .
(8) Worn or broken piston rings. (8) Inspect piston rings and
cylinders.
Interstage pressure (1) 1st stage safety valve faulty. (1) Check setting of safety valve.
reading too high Adjust as necessary. Setting
(1st stage relief valve should be 3.1 bar.
exhausting). (2) 2nd stage valves faulty. (2) Remove valves. Inspect valve
plates, springs and seats.
Check condition of ring joints.
Renew as necessary.
(3) Intercooler passages (3) Clean intercooler internally and
obstructed (usually only externally.
after very long service).
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