CompAir Classic 05 - System Pressure Low; Low or no Air Delivered by Compressor

WARNING !
READ HEALTH AND SAFETY PRECAUTIONS BEFORE YOU START ANY SERVICE WORK.
Servicing of the compressor must only be carried-out by authorised persons fully trained and competent in the maintenance of
CompAir UK Hydrovane compressors. They must fully understand and adopt correct and safe working practices.
05/07 Troubleshooting chart
Ref Symptom
Cause
(Level 1)
Cause
(Level 2)
Diagnosis
Cause
(Level 3)
Action
A
System pressure low
1.1
Demand
exceeds
capacity
Air leaks in
air-line system
Audible check for air leaks
or time pressure decay.
Identify and rectify leaks
1.2
Low output
from
compressor
See B
B
Low or No air delivered by compressor
2.1
Compressor
not rotating
Motor not
running
Visual check of cooling fan
Electrical
supply failure
Restore supply
System
pressure switch
fault
Repair pressure switch
Drive coupling
failure
Remove grommet from
bell housing and visually
check coupling.
Mechanical
breakdown
Replace coupling
2.2
Compressor
rotating in
reverse
Visual check of cooling fan
against direction arrow on
compressor.
Motor wiring
reversed
Correct motor direction
(Note that compressor will
be damaged if run in
reverse.)
2.3
Motor speed
low
Check motor speed with
optical tachometer.
Electrical
supply fault
Check speed and rectify
supply
2.4
Intake filter
blocked
Heavy
contamination
Dismount intake filter and
check for presence of
excessive dirt.
Environmental
conditions
Replace air filter
Maintenance
failure
Replace air filter
2.5
Safety valve
lifting
Check for short loud
pressure release from
behind air filter and oil on
air filter.
See G
2.6
Minimum
pressure valve
closed
Adjustment
incorrect
Read pressure gauge and
follow adjustment
procedure.
Service error or
Spring wear
Adjust MPV
Valve jammed
Read pressure gauge. If
no output from
compressor, remove MPV
and examine.
Mechanical
failure
Replace MPV
2.7
Servo set too
low
Adjustment
incorrect
Follow adjustment
procedure. If rated
pressure cannot be
achieved inside
compressor, remove and
change spring.
Service error Adjust servo
Servo spring
worn or broken
Check length against new
spring.
Replace spring and adjust
2.8
Oil separation
system blocked
Separators
blocked
Read pressure gauge. If 1
bar, remove separator cap
and bottle and examine.
Contamination
Replace separator and
return restrictors
Page 92
CompAir Hydrovane
6 Fault Finding