Main Wheel Removal; Main Wheel Inspection And Repair; Main Wheel Reassembly; Disassembly (Mccauley) - Cessna 150 STANDARD Service Manual

5-11. MAIN WHEEL REMOVAL (See figure 5-1.)
NOTE
It
is not necessary to remove the main wheel
to reline brakes or remove brake parts, other
than the brake disc on torque plate,
a. Hoist or jack aircraft as outlined in Section 2.
b. Remove speed fairing, if installed, in accor-
dance with paragraph 5 -10.
c. Remove hub caps, cotter pin and axle nut.
d. Remove bolts and washers attaching brake back
plate to brake cylinder and remove back plate.
e. Pull wheel from axle.
5-12. MAIN WHEEL DISASSEMBLY (Cleveland
Wheel).
a. Remove valve core and deflate tire. Break
tire beads loose from wheel rims.
IWARNING'
Injury can result from attempting to
separate wheel halves with the tire in-
flated. Avoid damaging wheel flanges
when breaking tire beads loose. A
scratch, gouge, or nick may cause
wheel failure.
b. Remove thru-bolts and separate wheel halves,
removing tire, tube, and brake disc.
c. Remove the grease seal rings, felts, and bear-
ing cones from the wheel halves.
NOTE
The bearing cups (races) are a press fit in
the wheel halves and should not be removed
unless a new part is to be installed. To re-
move bearing cups, heat wheel half in boil-
ing water for 30 minutes, or in an oven not
to exceed 149°C (300°F). Using an arbor
press, if available, press out the bearing
cup and press in the new bearing cup while
the wheel half is still hot.
5-13. MAIN WHEEL INSPECTION AND REPAIR
(Cleveland Wheel).
a. Clean all metal parts and grease seal felts in
solvent and dry thoroughly.
b. Inspect wheel halves for cracks. Cracked wheel
halves shall be discarded and new parts used. Sand
out nicks, gouges, and corroded areas. When the
protective coating has been removed, the area should
be cleaned thoroughly, primed with zinc chromate
and painted with aluminum lacquer.
c.
If
excessively warped or scored, or worn to a
thickness of 0.190 -inch, brake disc should be re-
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
grease (Section 2) before installing in wheel half.
5-14. MAIN WHEEL REASSEMBLY. (Cleveland
Wheel).
a. Insert thru-bolts through brake disc and position
disc in the inner wheel half, using the thru-bolts to
guide the disc. Ascertain that the disc is bottomed
in the wheel half.
b. Position tire and tube on outboard wheel half
with the tube inflation valve through hole in wheel
half.
c. Place the inner wheel half in position on out-
board wheel half. Apply a light force to bring wheel
halves together. While maintaining the light force
assemble a washer and nut on one thru-bolt and tight-
en snugly. Assemble the remaining washers and
nuts on the thru-bolts and torque to the value stipu-
lated in the chart in figure 5-2A.
jCAUTION\
Uneven or improper torque of thru-bolt
nuts can cause failure of bolts, with
resultant wheel failure.
d. Clean and pack bearing cones with clean air-
craft wheel bearing grease (Section 2).
e. Assemble bearing cones, grease seal felts, and
rings into wheel halves.
f. Infl ate tire to seat tire beads, then adjust to
correct tire pressure. Refer to Section 1.
5-15. MAIN WHEEL DISASSEMBLY (McCauley
Wheel).
a. Remove valve core and deflate tire and tube.
Break tire beads loose from wheel flanges.
IWAR.NING'
Injury can result from attempting to remove
wheel flanges with the tire and tube inflated.
Avoid damaging wheel flanges when breaking
tire beads loose. A scratch, gouge or nick
in wheel flange could cause wheel failure.
b. Remove thru-bolt nuts and washers or capscreWSI
from outboard wheel flange.
c. Remove thru-bolts and washers or capscrews
from inboard wheel flange.
d. Remove brake disc.
e. Separate wheel flanges from wheel hUb. Retain
spacers on each side of wheel hub.
f. Remove wheel hub from tire.
g. Remove retainer rings and remove grease seal
retainers, grease seal felts, and bearing cones.
NOTE
The bearing cups (races) are a press 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,
or in an oven not to exceed 121°C (250°F).
USing an arbor press,
if
available, press
out the bearing cup and press in the new
bearing cup while the wheel hub is still
hot.
Change 3 5-8A