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ASSEMBLY
OF THE
MAIN LANDING
GEAR
SHOCK
n.
Work
the
piston
up and down a few
times to
make
STRUT
(Airplanes
prior
to
Serial
TD-252)
sure
it operates
freely
and does
not
bind.
a.
Install
the
upper
torque
knee assembly
and attaching
o.
Fill
the
dry strut
with
759
cc or 25.7 fluid ounces
hardware
on
the
barrel
assembly.
The zerk lubrication
of MIL-H-5606
hydraulic
fluid and install
the
AN6230-2
fittings
should be on
the
upper
side.
"O"
ring,
plug,
lock pin and snap
ring.
Tap
the
snap
ring
until
it fits
snugly
under
the
ledge
of
the
collar
b.
Install
the
lower
torque
knee
assembly
and attach-
and fitting.
The snap ring should
be installed
with
the
ing hardware
on
the
piston
assembly.
Zerk
lubrica-
beveled
edge
down.
If a fluid measuring
device
is not
tion fittings
should
face
down.
available
use
the
following
refill
procedure.
c.
Tap
the
number
16 cork
about
1-1
4
inches
into
the
1. With
the
strut
extended
at
least
1/4-inch
fill
the
axle end of
the
piston
assembly.
strut
with MIL-H-5606
hydraulic
fluid and fully actuate
the
strut
slowly
several
times
to
remove
all air from
d. Slide snap ring,
adapter
and
the
scraper
on
the
pis_
below
the
orifice;
then
refill
with
the
strut
at least
1 4-
ton
assembly
in
that
order.
The horizontal
flat surface
inch from
the
fully
compressed
position.
of
the
ring must be down.
2. Install
the
"O" ring seal around
the
mner
ledge of
e.
Install
"O" ring in
the
groove
in
the
center
brazed
the top
of
the
barrel
assembly.
Install
the
barrel
end
bearing
of
the
barrel
assembly.
Use
two
small
dowel
plug and lock pin over
the
"O" ring and install
the
snap
rods
to
work
the
seal
in position.
Hold
the
"O" ring
ring with its beveled
edge facing down.
Tap it back into
with one rod while working
it into
the
groove
with
the
the
groove
under
the top
edge of
the
barrel
assembly.
other.
See Figure
5-2.
3.
Install
the
AN902-5
"O" ring
over
the threads
of
f. Soak
the
felt pad in SAE No.
10
oil,
roll and insert
the
air valve
assembly.
Screw
the
air valve assembly
in
the
barrel
assembly,
fitting
it between
the
center
(minus
the
valve
core)
into
the
barrel
end plug.
brazed
bearing
and
the
lower
end fitting.
4. Extend
the
strut
at least
two
inches,
then
compress
g.
Insert
the
piston
into
the
barrel
assembly.
it completely
allowing
the
excess
air and fluid
to
escape
through the
air
valve
body.
h.
Slide
the
scraper,
adapter
and snap
ring
up
the
piston
assembly
and into
the
lower
end of
the
barrel
NOTE
assembly.
If
the
strut
has been properly
refilled
a little
i.
Fit
the two
MS28782-24
plastic
back-up
rings
with
fluid will escape
through
the
air valve
body.
If
the
AN6227-24
"O" ring
between
them
in
the
groove
no fluid
escapes,
slowly
actuate
the
strut
sev-
at
the
bottom
of
the
rebound
control
assembly.
Dip
the
eral
times,
remove
the
snap ring and plug and
rebound
control
assembly
head in MIL-H-5606
fluid
to
repeat
steps
1,
2, 3 and 4.
ease
installation.
p.
Install
the
air valve
core.
j.
Slip
the
AN6227-6
"O" ring over
the threaded
end of
the
rebound
control
assembly
pin
and
fit it snugly
a-
q.
Inflate
the
strut
to
approximately
80 psi and smear
gainst
the
welded
flange.
soap
suds
over
the
air valve
assembly
and
top
of
the
barrel
assembly
to test
for leaks.
k.
Insert
the
rebound
control
assembly
into
the top
of
the
barrel
assembly
until
the threaded
end of
the
re-
r.
When
the
airplane
is
again on
the
ground
with
the
bound control
assembly
pin comes
through the
hole in
weight of
the
craft
on
the
gear,
check
the
strut
inflation.
the
bottom
of
the
piston
assembly.
The
"O"
ring men-
There should
be
two
inches
of piston
exposed
with
the
tioned
in step
j. should fit
into
the
spot-faced
depres-
airplane
empty
except
for fuel.
sion around
the
hole in
the
bottom
of
the
piston
assem-
bly
to
prevent
fluid leaks.
DISASSEMBLY
OF MAIN GEAR
SHOCK STRUT
1. Secure
the
rebound
control
assembly
to the
piston
(Airplane
Serial
TD-252
and
after)
assembly
as
follows:
Install
the thick
contoured
washer
on
the threaded
end
of
the
rebound
control
assembly
a.
Deflate
strut
completely
and remove
the
air valve
pin,
fitting
it
to the
curved surface
of
the
bottom
of
the
assembly.
piston.
Next install
the
flat washer
and secure
with
the
nut.
Tighten
the
nut by holding
the
slotted
head of
the
rebound
control
assembly
pin
with a long screwdriver
WA
RN
I
NG
inserted
through the top
of
the
barrel
assembly.
Do not unscrew
the
air valve
assembly
until all
m.
Connect
the two
halves
of
the
torque
knee
as
fol-
air pressure
has been
released
or it may be
lows:
Install
the
bushing
in
the
upper
torque
knee half.
blown out
with considerable
force
and cause
in-
Join
the two
halves with
the
bolt and nut, putting
a
wash-
jury or
damage.
er next
to
the
head of
the
bolt and one
next
to the
nut.
Secure
with a
cotter
pin.
Be
careful
not
to tighten the
b.
Remove
the
retainer
ring
and pull
the orifice
tube
nut so much
that
it binds
the
torque
knee.
assembly
out
of
the
barrel.
5-9
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Troubleshooting
