Cessna 1969-1976 172 Series Service Manual page 87

NOTE
When removing axle f r o m spring-strut, note
number and position of the wheel alignment
shims between axle and spring-strut.
Mark these s h i m s o r tape them to-
gether carefully s o that they can be in-
stalled in exactly the s a m e position
to ensure wheel alignment is not dis-
turbed.
5-17. MAIN WHEEL AXLE INSTALLATION. (FLAT
GEAR. )
a.
Secure axle and brake components to spring-
strut, making s u r e that wheel alignment shims and
speed fairing mounting plate
(if
used) are installed
i n their original position.
with paragraph 5-15.
cylinder.
dance with paragraph 5-54.
with paragraph 5-10.
b. Install wheel assembly on axle in accordance
c. Connect hydraulic brake line to wheel brake
d. Fill and bleed affected brake system in a c c o r -
e. Install speed fairing (if used) in accordance
5-18.
MAIN WHEEL AXLE REMOVAL. (TUBULAR.)
a. Remove speed fairing,
if
installed, in a c c o r -
b. Remove wheel in accordance with paragraph
c. Disconnect, drain, and cap o r plug hydraulic
d. Remove four bolts attaching brake torque plate
e. Remove cotter pin, nut, washer, and bolt
f.
Remove axle f r o m spring-strut.
dance with paragraph 5-10.
5-11.
brake line a t the wheel brake cylinder.
and speed fairing mounting plate to axle.
attaching axle to tubular strut.
5-19. MAIN WHEEL AXLE INSTALLATION. (TU-
BULAR. )
on faying surfaces of axle and spring-strut. Axle
is installed with tapered edges to bottom.
b. Install bolt, washer, and nut attaching axle to
spring-strut. After tightening nut, install cotter
pin,
c. Install brake components and speed fairing
mounting plate to axle.
d. Install wheel on axle in accordance with para-
graph 5-15.
e. Connect hydraulic brake line to wheel brake cy-
linder.
f.
Fill and bleed hydraulic brake system in a c c o r -
dance with paragraph 5-54.
g. Install speed fairing, if used, in accordance
with paragraph 5-10.
a. Install axle on spring strut, using wet p r i m e r
5-22. MAIN WHEEL ALIGNMENT (FLAT GEAR).
C o r r e c t main wheel alignment, for the flat gear, is
obtained through the use of tapered shims between the
flange of the axle and spring-strut. See figure 5-4
for procedure to use when main wheel alignment is
required. Wheel shims and the correction imposed
on the wheel by the various shims and their location
are
listed i n the illustration.
NOTE
Failure to obtain acceptable wheel alignment
through the use of the shims indicate a de-
formed main g e a r spring-strut o r s t r u t a t -
taching bulkhead out of alignment.
I
5-22A. MAIN WHEEL ALIGNMENT (TUBULAR).
(Refer to figure 1-1. )
5-23. WHEEL BALANCING. Since uneven t i r e wear
is usually the cause of wheel unbalance, replacing the
t i r e probably will c o r r e c t this condition.
tube manufacturing tolerances permit
a
specified
amount of static unbalance. The light-weight point of
the t i r e is marked with
a
r e d dot on the t i r e sidewall
and the heavy-weight point of the tube is marked with
a
contrasting color line (usually near the inflation
valve stem). When installing
a
new t i r e and/or tube,
place these marks adjacent t o each other. If
a
wheel
shows evidence of unbalance during service,
it
may
be statically balanced. Wheel balancing equipment is
available from the Cessna Service P a r t s Center.
5-24. NOSE GEAR. The steerable nose wheel mount-
ed on an air-oil shock strut comprises the nose gear.
The shock s t r u t is secured to forgings riveted and/or
bolted t o the firewall and lower fuselage structure.
Nose wheel steering is afforded by two spring-loaded
push-pull r o d s from the rudder pedal b a r s . A hydrau-
lic fluid-filled shimmy dampener is provided t o mini-
mize nose wheel shimmy. Some models of the 172
Series are equipped with speed fairings and on some
models the speed fairing is optional equipment. The
various configurations of these nose wheel speed fair
-
ings are illustrated i n figure 5-5. Disassembly, in-
spection and r e p a i r , and reassembly of the various
nose wheel configurations
are
described in separate
paragraphs for each configuration.
having two wheel halves
are
manufactured by Cleveland
Aircraft Products Co. and webbed wheels having two
flanges and a hub
are
manufactured by McCauley Indus.
t r i a l Corporation. The Cleveland wheels are shown
in figure 5-7. The McCauley wheels have either alu-
minum flanges or s t e e l flanges
as
shown in figure 5-8.
The aluminum flanges are attached t o the wheel hub
by thru-bolts and nuts as shown in figure 5-8. The
steel flanges are attached to the wheel hub by either
thru-bolts or capscrews
as
shown in figure 5-8. Dur-
ing assembly of the nose wheel, the thru-bolt nuts o r
capscrews,
as
applicable, shall be tightened evenly
and torqued to the value specified in figure 5-2A.
T i r e and
The solid wheels
Change 3 5-11