Piper Cherokee Six - Page 238

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
5A-24.
CLEANING,
INSPECTION
AND
REPAIR
OF
MAIN
GEAR
ACTUATING
CYLINDER.
a. Clean
the
cylinder
parts
with
a suitable
dry
type
solvent
and
dry
thoroughly.
b.
Inspect
the
cylinder
assembly
for
the
following:
1.
Interior
walls
of cylinder
and
exterior
surfaces
of piston
for
scratches,
burrs,
corrosion,
etc.
2.
Threaded
areas
for
damage.
3. End
fitting
retainer
slot for
excess
wear.
4.
Rod
end fitting
and swivel
fitting
of
cylinder
for
wear
and
corrosion.
c.
Repairs
to
the
cylinder
are
limited
to polishing
out
small
scratches,
burrs,
etc.,
and
replacing
components.
(Refer
to Parts
Catalog
for
replacement
part
numbers.)
5A-25.
ASSEMBLY
OF
MAIN
GEAR
ACTUATING
CYLINDER.
(Refer
to
Figure
5A-9.)
a.
Install
O-ring
(5)
on the
exterior
of
the end
gland
(1).
b. Install
O-ring
(3) and
back-up
ring
(2)
in
the
interior
of the
end
gland.
c.
Install
O-ring
(8)
on the
body
of the
piston
assembly.
d. Lubricate
the
areas
around
the O-rings
with
hydraulic
fluid,
park-o-lube
or
vaseline;
slide
the
end
gland
on the
piston
rod
and
the
piston
into
the
cylinder
housing
(7).
e.
Insert
the
hook
end
of
a
new
lock
ring
(4) (P/N
755
997)
in the
slot
in
the cylinder
body
(7)
and
slot
in
the end
gland
(1).
Rotate
gland
counterclockwise
to
completely
wrap
lock
ring
into
assembly.
f. Align
port
in
end gland
and
cylinder
body.
g.
Check
smoothness
of
operation
of
piston
and
static
pressure
test
unit
to
check
for
possible
cut
O-rings.
5A-26.
INSTALLATION
OF
MAIN
GEAR
ACTUATING
CYLINDER.
a.
Attach
the cylinder
to
its
attachment
fitting
in
the wheel
well
using
bolt
and
nut.
b.
Attach
the
operating
rod
end
and
downlock
spring
swivel
fitting
to
the
upper
side
brace
retraction
fitting
by
using
bolt,
washer
and
nut.
Ascertain
swivel
fitting
is
free
to
rotate.
c.
Connect
the
downlock
spring
to the
swivel
fitting.
d.
Check
the
adjustment
of the
cylinder
rod
end.
(Refer
to
Adjustment
of
Main
Landing
Gear,
Section
VIA.)
e.
Operate
pump
to
purge
system
of air
and
check
fluid
level
in
reservoir.
f.
Remove
the
airplane
from
jacks.
5A-27.
HYDRAULIC
LINES.
5A-28.
REMOVAL
AND
INSTALLATION
OF
HYDRAULIC
LINES.
Remove
a
damaged
hydraulic
line
by
disconnecting
the
fitting
at
each
end
and
by
disconnecting
where
secured
by
brackets.
Refer
to
Figure
5A-2
as
an
aid
in
the
location
of
attaching
brackets
and
bends
in
the
lines.
Provide
a
small
container
for
draining
the
line.
Install
a
new
or
repaired
line
in
reverse.
Operate
the
pump
to
purge
the
system
of
air
and
check
fluid
level
in
reservoir.
HYDRAULIC
SYSTEM
Issued:
7/28/75
1J22