Cessna 1969-1976 172 Series Service Manual page 97

5-3lA. NOSE WHEEL DISASSEMBLY (McCauley
Wheel with Thru-bolts).
break t i r e beads loose at wheel flanges.
a.
Remove hub caps, completely deflate tire, and
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(WARNING)
Injury can r e s u l t from attempting to remove
wheel flanges with t i r e and tube inflated.
Avoid damaging wheel flanges when breaking
t i r e beads loose. A scratch, gouge or nick
in wheel flange may cause wheel failure.
b. Remove thru-bolt nuts and washers.
c. Remove thru-bolts and separate wheel flanges
1
from wheel hub. Retain s p a c e r s between wheel
flanges and wheel hub.
d. Remove wheel hub f r o m t i r e and tube.
e. Remove retainer rings and remove g r e a s e seal
retainers, g r e a s e s e a l felts, and bearing cones from
wheel hub.
NOTE
The bearing cups (races) are a p r e s s fit in
the wheel hub and should not be removed
unless a new part
is
to be installed. To r e -
move the bearing cup, heat wheel hub in
boiling water for 30 minutes, o r in a n oven
not to exceed 121°C (250'F). Using an
a r b o r press,
i f
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.
5-31B. NOSE WHEEL INSPECTION AND REPAIR
(McCauley Wheel with Thru-bolts).
a. Clean a l l metal parts, grease 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 or hub shall be discarded and
new p a r t s installed. Sand out smooth nicks, gouges,
and corroded a r e a s . When the protective coating has
been removed, the
area
should be cleaned thoroughly,
primed with zinc chromate and painted with aluminum
lacquer.
c. Carefully inspect bearing cones and cups for
damage and discoloration. After cleaning, pack bear-
ing cones with clean aircraft wheel bearing grease
(Section 2) before installing in wheel hub.
5-31C. NOSE WHEEL REASSEMBLY (McCauley
Wheel with Thru-bolts).
and tube.
of wheel hub.
wheel hub and with washer under head of thru-bolt
insert bolt through wheel flange and wheel hub.
align valve s t e m in cutout in wheel flange.
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a.
Insert tube in tire, aligning index marks on t i r e
bo Place wheel hub in t i r e with valve s t e m in cutout
c. Place spacer and wheel flange on one side of
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d. Place spacer and wheel flange on other side and
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. Uneven o r
improper torque of the thru-bolt nuts can
cause failure of the bolts, with resultant
wheel failure.
f . Tighten thru-bolt nuts evenly and torque to the
g. Clean and pack bearing cones with clean air-
h. Assemble bearing cones, grease seal felts and
i. Inflate t i r e to seat t i r e beads, then adjust to
values stipulated in figure 5-2A.
craft wheel bearing g r e a s e (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.
5-31D. NOSE WHEEL DISASSEMBLY (McCauley
Wheel with Capscrews).
a.
Remove hub caps, completely deflate t i r e and
break t i r e beads loose a t wheel flanges.
(WARNING)
Injury can result from attempting to remove
wheel flanges with tire and tube inflated.
Avoid damaging wheel flanges when breaking
t i r e beads loose. A scratch, gouge o r nick in
wheel flange could cause wheel failure.
b. Remove capscrews and washers.
c. Separate wheel flanges f r o m wheel hub. Retain
s p a c e r s on each side of wheel hub.
d. Remove wheel hub from
tire.
e. Remove retainer rings and remove g r e a s e seal
retainers, g r e a s e seal felts and bearing cones.
NOTE
The bearing cups ( r a c e s )
are a
press-fit in
the wheel hub and should not be removed un-
l e s s a new part is to be installed. To remove
the bearing cup, heat wheel hub in boiling
water for 30 minutes, or in an oven not to ex-
ceed 121°C(2500F). Using an arbor p r e s s ,
if
available, p r e s s in the new bearing cup while
the wheel hub is still hot.
5-31E.
NOSE WHEEL INSPECTION AND REPAIR
(McCauley Wheel with Capscrews).
Refer to paragraph 5-31B.
Wheel with Capscrews).
a.
Insert tube in tire, aligning index marks on t i r e
and tube.
b. Place wheel hub in t i r e with valve stem in cutout
of wheel hub.
c . Place spacer and wheel flange on one side of
wheel hub.
d. Place washer under head of each capscrew, i n -
s e r t capscrew thru wheel flange and spacer and star1
capscrews into wheel hub threads.
5-31F. NOSE WHEEL REASSEMBLY (McCauley
Change 3 5 -18A/(5 -18B blank)