Cessna 177 SERIES Service Manual

5-311. SHIMMY DAMPENER DISASSEMBLY. (Refer
/ 2
to figure
5-12.)
/ 3
a. Remove screw
(1) and stat-o-seal
(2) and drain
fluid.
X-, // S ]
4
b. Remove
outer retainer
(5). bearing head (6)
and
1\^ / I, inner retainer (5).
'\~,d f h ~1 /
!
c
c. Remove piston and rod assembly
(9 and 8).
9
5
d.
To remove
piston
(9) from
rod
(8), remove
pin
8
v
~
ft~-?
'<
^
(10).
e. Remove
all O-rings
(7) and (11).
5-31J. SHIMMY
DAMPENER INSPECTION
AND RE-
~~/'.~
*C-- \ A~ d
PAIR (Refer to figure
5-12.)
6<-J \~
a- Inspect
heli-coil inserts
(3) for looseness
or
6\ /
^\;6
l-/-damaged
threads.
b. Inspect
piston
(9)
for fit
on shaft
(8):
replace
if
loose.
7
\c.
Inspect
retainer
rings
(5) and
retainer
ring
grooves
in barrel
(4) for
sharp edges.
[.Jy~~~2 l~~ /d.
Check retainer
rings (5) for cracks or distortion.
e. Discard all O-rings.
5-32. SHIMMY
DAMPENER
REASSEMBLY.
(Refer
to
figure
5-12.)
1. Tow-Bar
Spacer
6. Heavy-Duty
Fork
NOTE
2. Bushing
7.
Bolt
3.
Lower
Strut
8. Air
Filler
Valve
Dow
Corning
DC-4
is
recommended
for
4. Torque
Link
Fitting
9.
Adapter
O-ring
lubrication.
All
other
internal
5.
Bolt
parts
should
be
liberally
coated
with
hy-
draulic fluid
during assembly.
a.
Install O-ring (11)
in end of barrel
(4).
Figure
5-10.
Heavy-Duty
Nose
Gear
Strut
b. Install
rod
and piston
assembly
(8 and
9).
c.
Install inner
retainer
(5).
5-31D.
TORQUE LINK
INSPECTION
AND REPAIR.
d.
Install O-rings
(7) on bearing
head (6).
(Refer
to
figure
5-11. )
Torque
link bearings
and/or
e. Install
outer
retainer
(5).
bushings
should
not be
removed
except
for
replace-
f.
Before
installing
filler
screw
(1)
and stat-o-seal
ment
of parts;
replace
if excessively-worn.
(2), service
shimmy
dampener
as outlined
in
Section
2 of
this manual.
5-31E.
TORQUE
LINK
INSTALLATION.
(Refer
to
figure
5-11.)
5-33.
SHIMMY
DAMPENER
INSTALLATION.
(Refer
a.
With
shock
strut
completely
deflated,
install
to figure
5-6.)
upper and lower torque link assemblies.
b. Install
bolt,
washers
and bushing
attaching
upper
NOTE
and lower assemblies.
c.
Fill and
inflate
shock in
accordance
with
proce-
Prior
to installing
shimmy
dampener,
dures outlined
in
Section 2
of this manual
check fit
of bearings
(15)
and bushings
(16)
in
fork (10).
Make
sure they
are installed
5-31F.
SHIMMY
DAMPENER.
(Refer
to figure
5-12.)
as shown.
5-31G.
DESCRIPTION.
The shimmy
dampener
offers
a. Install
bolts
attaching
shimmy
dampener
to sup-
resistance
to shimmy
by
forcing
hydraulic
fluid
port
fork (10).
through small
orifices
in a
piston. Dampener
barrel
b. Install
bolt,
washers,
nut and
cotter pin
attaching
is attached
to a dampener
fork,
secured
to
a stationary
piston
rod to steering
collar
(12)
part of
the aircraft
structure.
The
piston rod
is
secured
to
the
nose
gear
steering
collar,
which
moves
5-34.
NOSE
WHEEL
STEERING
SYSTEM.
as the wheel is turned.
This causes relative
motion
between
barrel
and piston
rod.
5-35.
DESCRIPTION.
Nose
gear steering
is accom-
5-31H.
SHIMMY DAMPENER REMOVAL. (Refer
to plished through the rudder pedal and
rudder pedal
figure 5-6.
)
bars. A nose
gear steering bungee
is attached
to an
a. Remove
cotter pin,
nut, washers
and bolt
attach-
arm located
on one
of the rudder
pedal bars
(thru
ing piston
rod to steering collar
(12).
17701370) or through
linkage to two arms
located on
b. Remove
bolts attaching shimmy dampener to sup-
one of the rudder pedal bars (beginning with
17701371).
port fork (10):
remove dampener. The
opposite end of the bungee is attached to a rod
end
at the steering
collar on the nose
gear strut. The
5-16
Change
6

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)