PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 3
Nov 30/06
3I19
37-00-00
CHART 1 (Sheet 2 of 2)
TROUBLESHOOTING VACUUM SYSTEM
Trouble Cause Remedy
* AUX ON selected on ground Circuit breaker open. Push circuit bleaker(s) in.
check and auxiliary vacuum
pump will not run. Faulty electrical motor. Isolate and check
operation.
Replace pump/motor
assembly if required.
Faulty contactor. Check operation.
Replace if required.
Loose or broken wire connections. Tighten all wire
connections and terminals.
Check all wires for open
breaks; repair as needed.
* AUX ON selected on ground Leak in vacuum system. Tighten clamps and check
check and little or no vacuum hoses. Replace if
is indicated; AUX ON necessary.
annunciator will not light.
Restriction in hose lines. Inspect and repair hose
lines. Replace if necessary.
Dirty filter. Replace filter.
Faulty bulb. Replace bulb.
Regulator not adjusted properly. Adjust properly.
* VAC OFF AUX ON annunciator Open circuit breaker. Push circuit breaker(s) in.
switch will not engage auxiliary
vacuum pump system. Faulty switch. Test switch for operation.
Replace if necessary
* Auxiliary vacuum pump Auxiliary vacuum pump is worn. Replace auxiliary vacuum
maintains correct pressure on pump assembly.
the ground but not at altitude.
Regulator is sticky. Clean or replace regulator.
* - applies only to optional auxiliary vacuum system - see 37-10-00.
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