2F20
TABLE X-I. TROUBLESHOOTING CHART (VACUUM SYSTEM) (cont)
Vacuum correct but pilot
Regulator sticky.
Clean regulator.
reports erratic indication
of complete loss in flight.
Oil in pump due to leaky
Replace pump.
engine flange seal or
cleaning fluid blown into
pump while cleaning engine.
Vacuum can only be
Leak in system.
Repair or replace lines.
maintained at full
throttle on ground.
Worn pump.
Replace pump.
Stuck regulator.
Clean or replace regulator.
AUX ON selected on
Circuit breaker open.
Reset circuit breaker(s).
ground check and
auxiliary vacuum pump
Faulty electric motor.
Isolate and check operation.
will not run.
Replace pump motor
Faulty contactor.
assembly if required.
Loose or broken wire
Tighten all wire connections
connections.
and terminals.
Check all wire for open
breaks; repair as needed.
AUX ON selected on
Leak in vacuum system.
Tighten clamps and check
ground check and little
hoses. Replace if necessary.
or no vacuum is indicated.
AUX ON annunciator will
Restriction in hose lines.
Inspect and repair hole lines.
not illuminate.
Replace if necessary.
Dirty filter.
Replace filter.
Faulty bulb.
Replace bulb.
Regulator not adjusted
Adjust properly.
properly.
VAC OFF AUX ON
Open circuit breaker.
Push circuit breaker(s) in.
annunciator switch will
not engage auxiliary
Faulty switch.
Test switch for operation.
vacuum pump system.
Replace if necessary.
Auxiliary vacuum pump
Auxiliary vacuum pump
Replace auxiliary vacuum
maintains correct pressure
is worn out.
pump assembly.
on the ground but not at
altitude.
Regulator is sticky.
Clean or replace regulator.
Trouble
Cause
Remedy
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
INSTRUMENTS
Summary of Contents for ARROW III
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