Piper Cherokee Six - Page 230

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
b.
Connect
the
manual
control
push
rod
(30)
to
the
actuator
control
arm
(19)
using
clevis
pin
(1).
Place
a washer
over
end
of
clevis
pin
and
secure
with
cotter
pin.
c.
Move
the
actuator
on
its
mounting
brackets
to
allow
the
manual
control
push
rod
to
have
maximum
clearance
from
the
left
stabilator
cable
and
center
in the
fairlead
on
the
aft
face
of
the
main
spar
box.
Check
system
for
sufficient
travel
and
freedom
of
movement
of
controls.
Tighten
actuator
attaching
hardware.
NOTE
Care
should
be used
when
attaching
the
forward
hose
(13)
to
the
diaphragm
assembly
(10)
so
that
no
strain
is
placed
on
the
teflon
bushing
(15)
and
diaphragm
shaft
(16),
thus
causing
friction
in
movement.
d.
Connect
hydraulic
tubes
(26,
39,
40
and
41)
to
cross
(38)
and
tee
(46).
e.
Connect
the
pressure
(13)
and
static
(11)
hoses
to
the
elbows
(12)
of
the
diaphragm
housing
(10).
Secure
hoses
with
clamps.
f.
Connect
the
actuator
electrical
leads
terminal
to
their
mating
terminals
and
insulate.
Refer
to
the
electrical
schematic
for
hookup.
g.
Check
the
actuator
adjustments
as
given
in Paragraph
5A-14.
h.
Check
to
insure
that
maximum
distance
between
end
of
link
(18)
and
teflon
bushing
(15)
does
not
exceed
.65
inch.
Override
must
be
engaged
for
this
check.
Make
any
adjustments
at the
control
cable
assembly
connector
located
at the
spar
box
linkage.
(Refer
to
Figures
5A-
6, detail B, and 5A-2, Note
1.)
i.
Install
floorboard
and
center
seats.
5A-14.
CHECK
AND
ADJUSTMENT
OF
GEAR
BACK-UP
EXTENDER
ACTUATOR.
(Refer
to
Figure
5A-6.)
a.
If diaphragm
failure
is
suspected
note
the
following:
1.
If
the
landing
gear
retracts
or extends
at
too
high
an
airspeed
or will
not
retract
at
all
unless
the
back-up
extender
is placed
in
the
override
position,
then
the
diaphragm
is
possibly
defective.
2.
If
it
is determined
that
the
diaphragm
is
defective,
then
remove
the
Back-Up
Extender
per
instructions
given
in
Paragraph
5A-12
and
install,
Piper
Kit
No.
761
138V,
Back-Up
Gear
Extender
Diaphragm
Replacement.
Instructions
for
installing
the
diaphragm
are
included
in the
kit.
3.
Following
completion
of
Replacement
Kit,
reinstall
the
extender
unit
in
the
aircraft
and
functionally
test
and
adjust
as outlined
below
and
in
Paragraph
5A-14a.
b.
Adjustment
of the
gear
back-up
extender
actuator
is
preset
to
allow
the
hydraulic
valve
(25)
of the
actuator
to
open
when
the
airspeed
is
reduced
below
118
MPH
(103
Kts)
with
the
engine
power
OFF.
This
adjustment
is accomplished
by
setting
the tension
of
spring
(24)
on
the
actuator
with
adjustment
screw
(2)
as follows:
NOTE
The
airspeed
at which
the
hydraulic
valve
of
the
actuator
opens
was
preset
at the
factory
under
ideal
conditions.
There
could
be
some
variations
at
different
altitudes
and
atmosphere
conditions.
Revised: 12/15/80 HYDRAULIC SYSTEM
1J14