Cessna 150M - Main Wheel Installation; Main Wheel Axle Removal (Flat Gear)

d. Tighten capscrews evenly and torque to the value
specified in figure 5-2A.
e. Place spacer and wheel flange on outboard side
of wheel hub and align valve stem cutout in wheel
flange.
f. Place washer under head of each capscrew,
insert caps crew thru wheel flange and spacer and
start capscrews into wheel hub threads.
ICAUTION!
Be sure that spacers and wheel flanges are
seated on flange of wheel hub. Uneven or
improper torque of capscrews can cause
failure of the caps crews, or hub threads
with resultant wheel failure.
g. Tighten caps crews evenly and torque to values
specified in figure 5-2A.
h. Clean and pack bearing cones with clean aircraft
wheel bearing grease. (Refer to Section 2 for grease
type. )
i. Assemble bearing cones, grease seal felts and
retainer into wheel hub.
j.
Inflate tire to seat tire beads, then adjust to cor-
rect tire pressure. Refer to figure 1-1 for correct
tire pressure.
5-18. MAIN WHEEL INSTALLATION.
a. Place wheel assembly on axle.
b. Install axle nut and tighten axle nut until a slight
bearing drag is obvious when the wheel is rotated.
Back off nut to nearest castellation and install cotter
pin.
c. Place brake back plate in position and secure
with bolts and washers.
d. Install hub cap. Install speed fairing (if used) as
outlined in paragraph 5-10.
ICAUTION!
Always check scraper-to-tire clearance after
installing speed fairings, whenever a tire has
been changed, and whenever scraper adjust-
ment has been disturbed. If the aircraft is
flown from surfaces with mud, snow, or ice,
the fairing should be checked to make sure
there is no accumulation which could prevent
normal wheel rotation. Refer to paragraph
5-10 for correct scraper-to-tire clearance.
5-19. MAIN WHEEL AXLE REMOVAL (FLAT GEAR).
a. Remove speed fairing, if installed, in accordance
with paragraph 5-10.
b. Remove wheel in accordance with paragraph 5-11.
c. Disconnect drain, and plug or cap the hydraulic
brake line at the wheel brake cylinder,
d. Remove four nuts, washers, and bolts securing
axle, brake components, and speed fairing mounting
plate (if used) to spring strut.
NOTE
When removing axle from spring-strut, note
number and position of the wheel alignment
shims between axle and spring-strut. Mark
these shims or tape them together carefully
so they can be installed in exactly the same
position to ensure wheel alignment is not
disturbed.
5-20. MAIN WHEEL AXLE INSTALLATION (FLAT
GEAR).
a. Secure axle and brake components to spring-
strut, making sure that wheel alignment shims and
speed fairing mounting plate (if used) are installed
in their original position. Ascertain that bushings
in brake torque plate are installed in the upper
mounting holes.
b. Install wheel assembly on axle in accordance
with paragraph 5-18.
c. Connect hydraulic brake line to wheel brake
cylinder.
d. Fill and bleed affected brake system in accor-
dance with paragraph 5-58.
e. Install speed fairing (if used) in accordance with
paragraph 5-10.
5-21. MAIN WHEEL AXLE REMOVAL (TUBULAR).
Refer to figure 5-4.
NOTE
Axles are bonded to the struts of tubular
gear aircraft with (3M) EC2216 adhesive.
The bond is too strong to allow the axle
to be
removed without first weakening the
bond strength. The only methods of weak-
ening the bond are with heat or cryogenic
cold; heat being the most practical. A
temperature of approximately 500°F. is
sufficient to weaken the bond so the axle
can be removed. This is still a low enough
temperature to prevent damage to the tubu-
lar strut, but will age the aluminum axle.
Therefore, the axle will have to be replaced.
a. Remove speed fairings, if installed, in accor-
dance with procedures outlined in paragraph 5-10.
b, Remove wheels as outlined in paragraph 5-11.
c. Disconnect, drain, and cap or plug hydraulic
brake line at the wheel brake cylinder.
d. Remove cotter pin, nut and bolt attaching axle
to spring strut,
e. Remove brake components and speed fairing
plate from axle,
f. Remove axle as follows:
Change 3 5-11