Piper Cherokee Six - Page 502

PIPER
CHEROKEE
SIX SERVICE
MANUAL
9-6.
SUCTION
GAUGE.
9-7.
GENERAL.
The suction
gauge is
mounted
in the
right
side of
the instrument
panel.
This gauge
is
calibrated
in inches
of mercury
and indicates
the
amount
of vacuum
created
by
the engine
driven
vacuum
pump.
The
suction
gauge
installed
in
"71"
models
32-260-7100001
and
up, and
32-300-7140001
and up,
have
a direct
pressure
line
and
a vent
line.
Therefore,
these
aircraft
indicate
the differential
pressure
or actual
pressure
being
applied
to
the gyro
instruments.
As
the system
filter
becomes
clogged
or
lines obstructed,
the gauge
will show
a
decrease
in pressure.
Do
not reset
the
regulator
until
the
filter
and
lines
have
been
checked.
9-8.
TROUBLESHOOTING.
For
troubleshooting
of
this
instrument,
refer
to
Table
IX-I of
this
section.
9-9.
VACUUM
REGULATOR
VALVE.
9-10.
GENERAL.
One
vacuum
regulator
valve
is incorporated
in the
system
to control
vacuum
pressure
to
the gyro
instruments.
The
regulator
valve
is located
under
the
instrument
panel.
Access
to
the
valve for
maintenance
and
adjustment
is gained
from
below
the
instrument
panel.
9-11. TROUBLESHOOTING.
For troubleshooting
of
the vacuum
regulator
refer
to Table
IX-I.
9-12.
ADJUSTMENTS
OF
VACUUM
REGULATOR
VALVE.
a. Loosen
the locking
nut
or remove
the protective
cap from
the valve,
depending
on
which
type
is installed.
NOTE
Do
not
attempt
adjustment
of
this valve
with
the
engine
in
operation.
b. Start
the
engine,
after
allowing
time
for warm-up,
run
the
engine
at medium
RPM.
c.
With
the engine
at
full throttle,
the suction
gauge
should
indicate
4.4
inches
of
mer-
cury
on
PA 32-260
S/N
32-1
through
32-450;
4.6-5.0
inches
of mercury
on PA
32-260
S/N
32-451
through
32-1110
and
PA-32-300
S/N
32-40000
through
32-40565;
and
5.0 +.
-.2
on
PA-32-260
S/N
32-1
11 and
up,
PA-32-300
S/N
32-40566
and
up,
and
all 32R-300.
d.
After
the
system
pressure
has
been
adjusted
to
these
recommended
settings;
retighten
the
locking
nut
or
replace
the
protective
cap,
whichever
applies
to
the
type
of
valve
installed.
Revised: 12/15/80
INSTRUMENTS
2K10