Piper SARATOGA PA-32-301 Maintenance Manual page 396

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 3701. TROUBLESHOOTING (VACUUM SYSTEM) (cont)
Trouble
Cause
Remedy
Normal pressure indica-
tion but sluggish operation
of instruments.
High system pressure.
Faulty instrument.
Vacuum regulator in-
correctly adjusted.
Replace instrument.
Adjust regulator.
Vacuum regulator sticking
or dirty screen.
Clean and check operation
of regulator.
Regulator cannot be ad-
justed to produce correct
pressure.
Vacuum correct on ground
but will not maintain pres-
sure at altitude.
Vacuum correct but pilot
reports pressure erratic or
shows complete loss in
flight.
Pressure can only be main-
tained at full throttle on
ground.
Lines leaking.
Vacuum pump mal-
functioning.
Vacuum pump mal-
functioning.
Regulator sticky.
Regulator sticky.
Oil in pump due to leaky
engine seal or cleaning fluid
blown into pump while
cleaning engine.
Leak in system.
Worn pump.
Check lines and fittings.
Replace pump.
Replace pump.
Clean regulator.
Clean regulator.
Replace pump.
Repair or replace lines.
Replace pump.
Stuck regulator.
Clean or replace regulator.
37-00-02
Page 32-02
Issued: January 2, 1980
2F7