Piper Dakota - Page 377

37 - 02 - 00
Page 37 - 03
Reissued: August 1, 1986
2E5
CHART 370L. TROUBLESHOOTING (VACUUM SYSTEM) (CONT,D)
AUX ON selected on Circuit breaker open. Push circuit breaker(s)
ground check and in.
auxiliary vacuum pump
will not run
Faulty electrical motor. Isolate and check op-
eration. Replace pump/
motor assembly if re-
quired.
Faulty contactor. Check operation. Replace
if required.
Loose or broken wire Tighten all wire con-
connections. nections and terrninals.
Check all wires for open
breaks and repair ac-
cordingly.
AUX ON selected on Leak in vacuum system. Tighten clamps and check
ground check and little hoses. Replace if nec
or no vacuum is in- essary.
dicated.
AUX ON annunciator Restriction in hose Inspect and repair hose
will not light. lines. lines. Replace if nec-
essary.
Dirty filter. Replace filter.
Faulty bulb. Replace bulb.
Regulator not adjusted Adjust properly.
properly.
VAC OFF AUX ON Open circuit breaker. Push circuit breaker(s)
annunciator switch in.
will not engage auxiliary vacuum
pump system.
Faulty switch. Test switch for operation.
Replace if necessary.
Auxiliary vacuum pump Auxiliary vacuum pump Replace auxiliary vacuum
maintains correct is worn. pump assembly.
pressure on ground
but not at altitude.
Regulator is sticky. Clean or replace regu-
lator.
TROUBLE CAUSE REMEDY
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
AIRCRAFT WITH AUXILIARY VACUUM PUMP SYSTEMS