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PIPER CHEROKEE WARRIOR SERVICE MANUAL
10-5.
TROUBLESHOOTING.
TABLE X-I. TROUBLESHOOTING VACUUM SYSTEM
Trouble
No vacuum gauge indication at
instrument.
No vacuum gauge indication at
gauge or pump.
Low vacuum system pressure.
Normal pressure indication but
sluggish operation of i n s t r u m e n t s .
High system pressure.
Regulator cannot be adjusted to
produce correct pressure.
Vacuum correct on ground, but
will not maintain pressure at
a l t itude.
Vacuum correct, but pilot reports
pressure erratic or shows complete
loss in fight.
Revised: February 28, 1995
Cause
Filter clogged or dirty.
Line from gyro to filter restricted.
Faulty gauge or malfunctioning
pump.
Filter dirty.
Vacuum regulator valve incorr e c tly
adjusted.
Line from gyros to filter restricted.
Line from pump to gyros leaking.
Faulty instrument.
Vacuum regulator i n c o r r e c t l y
adjusted.
Vacuum regulator sticking or
dirty screen.
Lines leaking.
Vacuum pump malfunctioning.
Vacuum pump malfunctioning.
Regulator sticky.
Regulator sticky.
Oil in pump due to leaky engine
seal or cleaning fluid blown into
pump while clean
ing engine.
2B19
Island Enterprises
Remedy
Clean or replace filter.
Check line.
Replace gauge or pump.
Clean or replace filter.
Adjust regulator valve in
a c c o rdance with adjustments in
this section.
Repair line.
Check all lines and fittings.
Replace or tighten as necessary.
Replace instrument.
Adjust regulator.
Clean screen and check operation
of regulator.
Check all lines and fittings.
Replace or tighten as necessary.
Replace pump.
Replace pump.
Clean regulator.
Clean regulator.
Replace pump.
INSTRUMENTS
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Chapters
Table of Contents
Troubleshooting
