Raytheon Beech Baron E55 - Page 326

RayNReon
nircraff
Company
BARON
55
AND
58
SHOP
MANUAL
I
MA IN
LANDING
GEA
R
O VERHA
UL
(TC-25
1,
TC-344,
TC-355
AND
A
FTER;
TE-
I
AND
AFTER;
TH-
1
AND
AFTER)
NOTE:
Refer
to
the
OVERHAUL
AND
REPLACEMENT
SCHEDULE
in
Section
15
for
time
limits
and
maintenance
checks of
the
main
landing
gear.
Experience
in
the field
indicates the
points
of
greatest
wear on
the
main
landing
gear
are
the
upper
and
lower
bearings
in
the
cylinder
assembly.
The
wear
caused
on
the
bearings
during
takeoff,
landing
and
taxiing
tend
to
result
in
an
oversized condition.
The
oversized
condition
of
the
upper
bearing
in the
cylinder
assembly
will
result
in
leakage
of
hydraulic
fluid
through
the
upper
bearing
and
O-ring.
This will
eventually
cause
fluid
to
seep
down
through
the
felt
pad
and
out
the lower
bearing.
When
replacement
of the
scraper
ring
and all
O-rings
in
the
cylinder
assembly
fails
to
stop
leaks,
the
oversized
condition of
the
bearings
is
probable.
In
such instances the
landing
gear
should
be
overhauled. The
following
information
will aid in
determining
the
extent
of
landing
gear
wear
and
whether it is
possible
to
overhaul
or
necessary
to
replace
critical
landing
gear
components.
I
MAIN
GEAR
DISASSEMBLY
WARNING: Do
not
begin
any
disassembly
of the
main
landing
gear
until all air
pressure
has
been
released.
a.
Place the
landing
gear
in
a
vertical
position
to
prevent
hydraulic
fluid
from
spilling.
IP
Release the air
pressure
from
the
cylinder
assembly (9)
by depressing
the
valve
core
(2)
(Ref.
Figure
9).
To
prevent
damage,
remove
all
hydraulic
plumbing,
safety
switch
components
and
clamps.
d.
Remove
the main
wheel
and
brake
assembly.
Refer
to
Section
5,
REMOVING
THE
WHEEL
AND
BRAKE
ASSEMBLY.
e.
Remove the retainer
ring
(5)
and
retract
the
lower shock
assembly (35)
to
push
the
orifice
tube
(6)
out
of the
cylinder
assembly (9).
f. Invert
the
landing
gear
and
drain the
hydraulic
fluid.
g.
Remove
the air
valve
assembly (3) O-ring
(4), piston
ring
(8)
and
O-ring
(7)
from
the
orifice
tube
(6).
WARNING:
Do
not
disconnect the
torque
knees
(23
and
34)
without first
deflating
the
cylinder
assembly (9).
The
torque
knees
provide
the
extension
stop
for
the lower
shock
assembly
and
when
disconnected,
the shock
assembly
is free
to
slide
out
of the
cylinder
assembly
(9).
h.
Remove
the
nut,
washers
and bolt
(32)
connecting
the
upper
torque
knee
(23)
to
the
lower
torque
knee
(34).
i.
Remove
the
upper
and lower
torque
knees
(23
and
34)
by removing
the
upper
and
lower
torque
knee
pins
(21
and
31),
retaining
pins
and
cotter
pins.
j.
Slide
the lower
shock
assembly (35)
out
of the
cylinder
assembly (9).
CAUTION:
The
scraper
seal
(27)
may
become
sharp
during
normal
operation
of
the
gear;
care
should
be
exercised
to
avoid
possible
injury
when
removing
the
scraper
seal.
k.
Remove the
scraper
seal
(27),
felt
pad
(26),
O-ring
and retainer
rings
(17).
The
O-ring
is
located
between
two
retainers within
the
cylinder
assembly
(9).
Removal
of
the
O-ring
may
be
simplified
by
using
a
hook
I
manufactured from
music wire
(Ref.
Figure
10).
i.
Disconnect the
columns
(15)
and
brace
(Il)from
the
cylinder
assembly
(9)
and from
each
other.
Remove
bushings
(12)
from
the brace
(11).
Jun
30/04Page
32
SECTION
5
E22