2F19
TABLE X-I. TROUBLESHOOTING CHART (VACUUM SYSTEM)
No vacuum gauge indication
Open vacuum line.
Locate and repair.
at instrument.
Faulty instrument.
Replace.
No vacuum gauge indication
Faulty gauge or
Replace gauge or
at instrument of source.
malfunctioning pump.
replace pump.
Low vacuum system
Filter dirty.
Clean or replace filter.
indication.
Vacuum regulator valve
Adjust regulator valve per
not adjusted properly.
adjustments in this section.
Gyro to filter line
Repair or replace line.
restricted.
Pump to gyros line
Check all lines and
leaking.
fittings.
Abnormal gyro precession -
Dirty filter.
Replace filter first, then
vacuum gauge reading
adjust regulator.
correct or a maximum
pressure.
Normal vacuum indication
Faulty instrument.
Replace instrument.
but sluggish operation of
instruments.
Dirty or clogged filter or
Replace filter.
vacuum line kinked.
Replace damaged lines.
High system vacuum.
Vacuum regulator
Adjust regulator.
incorrectly adjusted.
Dirty or clogged filter.
Replace filter.
Vacuum lines kinked or
Repair or replace lines.
restricted.
Vacuum regulator sticking
Clean and check operation
or dirty screen.
of regulator.
Regulator cannot be
Lines leaking.
Check lines and fittings.
adjusted for correct
vacuum pressure.
Vacuum pump
Replace pump.
malfunctioning.
Vacuum connect on ground
Vacuum pump
Replace pump.
but not normal at altitude.
malfunctioning.
Regulator 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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