37 - 02 - 00
Page 37 - 02
Reissued: August 1, 1986
2E4
CHART 3701. TROUBLESHOOTING (VACUUM SYSTEM) (contd)
Normal pressure indication Faulty instrument. Replace instrument.
but sluggish operation of
instruments.
High system pressure. Incorrectly adjusted Adjust regulator.
vacuum regulator.
Sticking vacuum regulator Clean and check operation
or dirty screen. of regulator.
Regulator cannot be ad- Leaking lines. Check lines and fittings.
justed to produce correct
pressure.
Malfunctioning Replace pump.
vacuum pump.
Vacuum correct on ground Vacuum pump mal- Replace pump.
but will not maintain pres- unctioning.
sure at altitude.
Sticky regulator. Clean regulator.
Vacuum correct but pilot Sticky regulator. Clean regulator.
reports pressure erratic or
shows complete loss in
flight.
Oil in pump due to leaky Replace pump.
engine seal or cleaning fluid
blown into pump while
cleaning engine.
Pressure can only be main- Leak in system. Repair or replace lines.
tained at full throttle on
ground.
Worn pump. Replace pump.
Stuck regulator.
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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