Raytheon Beech Baron E55 - Page 318

Raytheon
nircraft
Company
BARON
55
AND
58
SHOP MANUAL
I
MAIN
LANDING GEAR
OVERHAUL
(TC-I
THRU
TC-354,
EXCEPT TC-251
AND
TC-344)
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
to
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.
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.
b.
Release
the air
pressure
from the
cylinder
assembly
(10)
by depressing
the
valve
core
in
the
air valve
assembly
1.
(1)
(Ref.
Figure
8).
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
snap
ring
(3),
barrel end
lock
(2),
barrel
end
plug (4)
and
retract
the
lower
shock
assembly
(37)
to
push
the
orifice tube
(11)
out
of
the
cylinder assembly
(10).
f. Invert
the
landing
gear
and
drain the
hydraulic
fluid.
g.
Remove
the
air valve
assembly
(1)
and
O-ring
(5)
from the barrel end
plug
(4).
h. Remove
the
piston ring
(16)
from
the
orifice
head
(15).
WARNING:
Do
not
disconnect the
torque
knees
(25
and
30)
without first
deflating
the
cylinder assembly
(10).
The
torque
knees
provide
the extension
stop
for the lower shock
assembly
and
when
disconnected,
the
lower shock
assembly
is
free to slide out
of
the
cylinder
assembly.
i. Remove
the
nut,
washer and
bolt
(29)
connecting
the
upper
torque
knee
(25)
to
the
lower
torque
knee
(30).
j.
Remove the
upper
and lower
torque
knees
(25
and
30) by
removing
the
upper
and lower
torque
knee
pins (24
and
32),
retaining
pins
and
cotter
pins.
k.
Slide
the lower shock
assembly
(37)
out
of
cylinder assembly
(10).
CAUTION:
The
scraper
seal
(18)
may
become
sharp during
normal
operation
of the
gear;
care
should be
exercised
to avoid
possible injury
when
removing
the
scraper
seal.
I
i.
Remove the
snap
ring
(20), adapter ring
(19)
and
scraper
seal
(18).
Remove
the
felt
pad
(14)
and
O-ring
(13).
The
O-ring
is located
in
the
upper
brazed
bearing
(13)
of the
cylinder assembly
(10).
Removal of
the
O-ring
may
I
be
simplified by using
a
hook
manufactured from
music wire
(Ref.
Figure
10).
m.
Remove
the
main
landing
gear
hinge
bushing
(8).
Jun
30/04Page
24
SECTION
5