Piper Cherokee Six - Page 227

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
10.
Connect
the
blue
lead
from
the
pump
motor
to
the
positive
terminal
of
the
power
supply.
With
a
high
pressure
indication
on
the
pressure
gauge,
the
ammeter
should
read
75
amperes
maximum.
Disconnect
the
blue
lead.
11.
Connect
the
green
lead
from
the
pump
motor
to
the
positive
terminal
of
the
power
supply.
With
low
pressure
indication
within
the
500
to
800
psi
range,
the
ammeter
should
read
between
15
to
35
amperes.
NOTE
In
the
event
any
of
the
various
tests
do
not
perform
satisfactorily,
the
pump
assembly
should
be
replaced.
12.
Disconnect
the
green
lead
from
the
power
supply
and
permit
the
pressure
to
drop
before
disconnecting
the
hydraulic
lines.
5A-10.
INSTALLATION
OF
HYDRAULIC
PUMP.
(Refer
to
Figure
5A-3.)
a.
Insert
grommet
(22)
in
pump
base
mounting
hole.
b.
Insert
bushing
(20)
in
grommet
(22).
c.
Place
washer
(21)
over
bolt
(19)
and
insert
bolt
through
grommet
(22)
and
bushing
(20)
and
pump
base
(16).
d.
Place
washer
(23)
and
bushing
(24)
over
bolt
(19)
and
secure
to
mounting
shelf
(25).
e.
Connect
hydraulic
lines
to
pump.
f.
Connect
pump
electrical
leads.
Blue
wire
to
outboard
(lower)
solenoid,
green
wire
in
inboard
(upper)
solenoid,
and
black
wire
to
ground
on
battery
shelf.
g.
Check
fluid
level
in
pump.
Refer
to
Section
II
for
filling
instructions.
h.
With
airplane
on
jacks,
operate
pump
to
purge
hydraulic
system
of
air,
and
check
for
leaks.
After
operation,
recheck
fluid
level.
5A-l1.
GEAR
BACK-UP
EXTENDER
ACTUATOR
ASSEMBLY.
5A-12.
REMOVAL
OF
GEAR
BACK-UP
EXTENDER
ACTUATOR
ASSEMBLY.
(Refer
to
Figure
5A-6.)
The
back-up
extender
actuator
is
located
under
the
center
seat
floorboard.
To
reach
the
actuator,
remove
the
center
seats
and
floorboard.
a.
Disconnect
the
actuator
electrical
leads
at
the
quick
disconnect
terminals.
b.
Disconnect
the
manual
override
control
rod
(30)
at the
actuator
control
arm
(19)
by
removing
cotter
pin,
washers,
and
clevis
pin
(1).
c.
Disconnect
the
pressure
(13)
and
static
(11)
hoses
from
the
elbows
(12)
of
the
diaphragm
housing
(10)
by
releasing
clamps
and
sliding
the
hoses
from
their
elbows.
The
hoses
should
be tagged
for
ease
of
reassembly.
d.
Place
a
shop
cloth
under
the
actuator
hydraulic
valve
(25)
to
absorb
fluid,
and
then
disconnect
the
hydraulic
tubes
(26,
39,
40
and
41)
from
cross
(38)
and
tee
(46).
Cover
open
tubes
and
fittings
to
prevent
contamination.
e.
Remove
the
hardware
that
secure
the
actuator
base
to
the
mounting
brackets.
There
are
two
mounting
bolts
at
the
inboard
side
of
the
base
and
one
mounting
screw
at
the
outboard
side
of
the
diaphragm
housing.
Remove
the
actuator
from
the
mounting
brackets.
Revised:
7/29/77
HYDRAULIC
SYSTEM
IJll