Cessna 150M - Main Wheel Axle Removal; Main Wheel Axle Installation

Do not place tape in
direct contact with
tubular gear spring.
1. Axle
2.
Tubular Gear Strut
3. Electrical Heating Tape
4. Plug
ICAUTION\
Due to aging of the aluminum axle, caused
by the heating tape, a new axle will have to
be installed.
Figure 5-4. Main Wheel Axle Removal
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:
NOTE
Axle should be removed from strut, using elec-
tric heating tape, which is available from Curtin
Scientific Company, 6550 East 42nd St., P. O.
Box 147, Tulsa, Oklahoma 74101. Tape should
conform
to the following: 192 watts, 24" long,
1" wide, flexible and heavily inSUlated.
5-12 Change 1
1. Wrap heating tape around axle from base
head to outer end of axle and tie it on with string
provided with tape.
Do not place tape in direct contact with
tubular gear spring.
2. Plug electric tape into 110 volt wall socket
and heat for 20 to 30 minutes.
3. Unplug tape and remove from axle. Remove
axle by striking axle base head with a few sharp
blows.
4. Clean any old adhesive off landing gear spring
with a wire brush. Brush strokes should run length-
wise along the spring. After old adhesive has been
removed, wipe with clean rag saturated with acetone
or alcohol. Immediately wipe dry with a clean, lint
free cloth.
Due to aging of the aluminum axle, caused by
the heating tape, a new axle will have to be
installed.
5-22. MAIN WHEEL AXLE INSTALLATION
(TUBULAR).
a. Prior to installing new axle, wipe outer surface
of tubular gear and inside surface of axle with sol-
vent, drying immediately with a clean, lint free
cloth.
b. Install new axles as follows:
1. Mix EA9309, EC2216 or equivalent adhesive, I
in accordance with instructions in package. Spread
adhesive thinly and evenly on outer surface of land-
ing gear spring in area that will be covered hy axle.