Cessna 1969-1976 172 Series Service Manual page 101

of the procedure outlined in paragraph 5-33 with the
exception that special attention must be paid to the
following procedures.
c. Sharp metal edges should be smoothed with No.
400 e m e r y paper, then thoroughly cleaned with sol-
vent.
d. Used sparingly, Dow Corning DC-4 compound is
recommended for O-ring lubrication. All other
internal p a r t s should be liberally coated with hydrau-
lic fluid during assembly.
NOTE
Cleanliness and proper lubrication, along
with careful workmanship are important
during assembly of the shock strut.
e. When installing steering a r m assembly, lubri-
cate needle bearing in collar with general purpose
g r e a s e (figure 2-5) before installing. If needle
bearing is defective, install new steering a r m a s s e m -
bly. Use s h i m s as required between steering a r m
assembly and washer to provide a no play fit with
retainer ring installed. Shims
are available from
the Cessna Service P a r t s Center as follows:
1243030-5
. . . . . . . . . .
0 . 0 0 6 inch
1243030-6
. . . . . . . . . .
0 . 0 1 2 inch
1243030-7
. . . . . . . . . .
0 . 0 2 0 inch
f.
When installing lock ring in lower end of upper
s t r u t groove, position lock ring so that one of
its
ends c o v e r s the small a c c e s s hole in the lock ring
groove
at
the bottom of the upper strut.
g. Temporary bolts or pins of c o r r e c t diameter
and length
are useful tools for holding p a r t s i n c o r -
r e c t relation to each other during assembly and in-
stallation.
dance with paragraph 5-26.
lined in Section 2.
h. After re-assembling the strut, install in a c c o r -
i.
After installation, service shock s t r u t
as out-
5-35. TORQUE LINKS. The torque links
are illus-
trated in figure 5-12? which may be used as a guide
f o r removal, disassembly, assembly, and installa-
tion. The torque links keep the lower s t r u t aligned
with the nose g e a r steering system but permit shock
s t r u t action. Torque link bushings should not be
removed except for replacement with new parts.
Excessively worn p a r t s should be replaced with new
parts. Always deflate nose gear s t r u t before dis-
connecting torque links.
5-36. SHIMMY DAMPENER. The shimmy dampen-
1
1. Hub 7 . Washer
2. Lower Strut 8. Lugs
9. Bolt
3. Nut
4 . Tow-Bar Spacer 10. Bolt
5. Washer 11. Fork
6 . Nut 12. Bushing
Figure 5-10. Heavy-Duty Shock Strut
e r provided for the nose g e a r offers resistance to
shimmy by forcing hydraulic fluid through small
orifices in a piston. The dampener piston shaft is
secured to a stationary part and the housing is se-
cured to the nose wheel steering a r m assembly which
moves
as the nose wheel
is turned, causing relative
motion between the dampener shaft and housing. The
shimmy dampener
is
shown in figure 5-11, which
may be used as a guide for removal, disassembly,
re-assembly, and installation. When assembling
Change 1 5-21