Vacuum Regulator View - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 3701. TROUBLESHOOTING (VACUUM SYSTEM) (cont)
Trouble
No vacuum gauge indi-
cation at instrument.
No vacuum gauge indi-
cation at instrument.
Low vacuum system
pressure.
A592
ADJUSTMENT
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Filter clogged or dirty.
Line from gyros to filter
restricted or leaking.
Faulty gauge or mal-
functioning pump.
Filter dirty.
Vacuum regulator valve
incorrectly adjusted.
Line from gyro to filter
restricted or leaking.
Line from pump to manifold
leaking.
SCREW
Figure 37-2. Vacuum Regulator
FILTER.
CLEAN OR REPLACE
AT 100 HOUR
INSPECTIONS.
LOCK TABS
2K11
Remedy
Clean or replace filter.
Check line.
Replace gauge. Replace
pump.
Clean or replace filter.
Adjust regulator valve in
accordance with adjustments
in this section.
Repair line.
Check all lines and fittings.
3 7 - 0 2 - 0 0
Page 37-04
Revised: May 15, 1989