Cessna 1969-1976 172 Series Service Manual page 81

disc in the inner wheel half, using thru-bolts to guide
the disc. Ascertain that the disc is bottomed in the
wheel half.
the tube inflation valve through hole i n wheel half.
wheel half. Apply a light force to bring wheel halves
together. While maintaining the light force assemble
a washer and nut on thru-bolt and tighten to maintain
force. Assemble the remaining washers and nuts to
the thru-bolts. Tighten nuts evenly t o the torque
value stipulated in the c h a r t in figure 5-2A.
b. Position t i r e and tube on outboard wheel half with
c. Place the inner wheel half in position on outboard
Uneven o r improper torque of thru-bolt nuts
can cause failure of bolts, with resultant
wheel failure.
d, Clean and pack bearing cones with clean a i r c r a f t
wheel bearing g r e a s e (figure 2-5).
e. Assemble bearing cones, g r e a s e seal felts, and
rings into wheel halves.
f. Inflate t i r e to seat t i r e beads, then adjust to
c o r r e c t t i r e pressure. See figure 1-1.
5-14A. MAIN WHEEL DISASSEMBLY (McCauley
Wheel).
a. Remove valve core and deflate t i r e and tube.
Break t i r e beads loose from wheel flanges.
(WARNING)
Injury can result from attempting to remove
wheel flanges with the t i r e and tube inflated.
Avoid damaging wheel flanges when breaking
t i r e beads loose. A scratch, gouge o r nick
i n wheel flange could cause wheel failure.
b. Remove thru-bolt nuts and washers o r capscrews1
c. Remove thru-bolts and washers or capscrews
d. Remove brake disc.
e. Separate wheel flanges from wheel hub. Retain
f . Remove wheel hub from tire.
g. Remove retainer rings and remove grease seal
f r o m outboard wheel flange.
from inboard wheel flange.
s p a c e r s on each side of wheel hub.
retainers, grease seal felts, and bearing cones.
I
NOTE
The bearing cups (races) are a p r e s s fit
in the wheel hub and should not be re-
moved unless a new part is to be install-
ed. To remove the bearing cup, heat
wheel hub in boiling water for 30 minutes,
o r i n a n oven not to exceed 121°C (250°F).
Using a n a r b o r press, if available, p r e s s
out the bearing cup and p r e s s in the new
bearing cup while the wheel hub is still
hot.
5-14B. MAIN WHEEL INSPECTION AND REPAIR.
(McCauley Wheel).
a. Clean all metal parts, g r e a s e seal felts and
mylar s p a c e r s in cleaning solvent and dry thoroughly.
b. Inspect wheel flanges, -and wheel hub for cracks.
Cracked wheel flanges o r hub shall be discarded and
new p a r t s installed. Sand out smooth nicks, gouges,
and corroded
areas.
When the protective coating has
been removed, the a r e a should be cleaned thoroughly,
primed with zinc chromate and painted with aluminum
lacquer.
c. If excessively warped or scored, o r worn to
a
thickness of 0. lgo-inch, brake disc should be r e -
placed with a new part. Sand smooth small nicks
and scratches.
d. Carefully inspect bearing cones and cups for
damage and discoloration. After cleaning, pack
bearing cones with clean aircraft wheel bearing
g r e a s e (Section 2) before installing in wheel hub.
5-14C. MAIN WHEEL REASSEMBLY. (McCauley
Wheel
-
Aluminum Flange).
a. Place wheel hub in t i r e and tube with tube in-
flation s t e m in cutout of wheel hub.
b. Place spacer and wheel flange on inboard side
of wheel hub (opposite of tube inflation stem), then
with washer under head of thru-bolt, insert bolt
thru brake disc, wheel flange, and wheel hub.
Place spacer and wheel flange on outboard side
of wheel hub with valve inflation stem through cutout
in wheel flange.
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c.
d.
e.
Install washers and nuts on thru-bolts.
Be s u r e that s p a c e r s and wheel flanges
a r e seated on flange of wheel hub. Un-
even o r improper torque of thru-bolt
nuts can cause failure of bolts, with re-
sultant wheel failure.
Tighten thru-bolt nuts evenly and torque to the
value stipulated in figure 5-2A.
wheel bearing grease. (Refer to Section 2. )
r e t a i n e r s into wheel hub.
correct t i r e pressure. See figure 1-1 for correct
t i r e pressure.
5-14D. MAIN WHEEL REASSEMBLY (McCauley
Wheel
-
Steel Flange).
a.
Place wheel hub in
tire
and tube with tube infla-
tion stem in cutout of wheel hub.
b. Place spacer and wheel flange on inboard side
of wheel hub (opposite of tube inflation stem).
c. Place washer under head of each capscrew, in-
s e r t capscrew thru brake disc, wheel flange, and
spacer and s t a r t capscrews into wheel hub threads.
f .
Clean and pack bearing cones with clean aircraft
g. Assemble bearing cones, grease seal felts, and
h. Inflate t i r e to seat t i r e beads, then adjust to
Change 3 5-8A