Piper Cherokee Six - Page 489

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
TABLE
IX-I.
VACUUM
SYSTEM
(cont)
Cause
Trouble
Remedy
No
vacuum
gauge
indica-
tion
at
instrument.
No
vacuum
gauge
indica-
tion
at
either
instru-
ment
or
source.
Hose
from
instrument
to
gauge
leaking
or
re-
stricted.
Faulty
gauge.
Mal-
functioning,
regulator
valve,
or
vacuum
pump.
Check
all
lines
and
connections.
Check
operation
of
instrument.
If
oper-
ation
is
normal,
re-
place
gauge.
If
instru-
ments
are
inoperative,
check
operation
of
vacuum
pump
or
regulator
valve.
Vacuum
lines
restricted
or
broken.
Check
system.
Low
vacuum
system
pressure.
Vacuum
regulator
valve
incorrectly
adjusted.
Adjust
regulator
valves
in
accordance
with
Adjustments
of
this
section.
Leaking
of
the
system
lines
or
fittings.
Malfunctioning
pump.
Overboard
line
from
vacuum
pump
restricted.
Sealing
plugs
loose
in
gyros.
Check
all
lines
and
fittings.
Replace
pump.
Replace
line.
Normal
pressure
indica-
tion,
but
sluggish
operation
of
instru-
ments.
Instruments
air
filter
elements
dirty.
Remove
and
clean
or
replace.
Line
restricted
be-
tween
gyro
and
filter.
Check
all
lines
and
fittings.
INSTRUMENTS
Revised:
8/7/74
2J21