Mooney M20M - Wheels and Brakes; Main Wheels; Main Wheel

MOONEY AIRCRAFT CORPORATION
M20M
SERVICE
AND
MAINTENANCE
MANUAL
TROUBLE
PROBABLE
CAUSE
REMEDY
Gear will
not retract
and
gear
Manual
engage
handle
in
Disengage
manual
system.
actuator
C/B
trips,
engaged position.
Aircraft does
not
track
or
steer
Nose
wheel
location
improper.
See SECTION
32-50-02.
properly.
Gear will
extend;
green
Lamp
burned
out
in annunciator
Push
press-to-test
on
annunciator
and
indicator-light
will
not
illuminate.
-green
-light
circuit.
replace
bumed
out
lamp
if needed.
Down-limit switch
inoperative.
Check
circuit
and/or
down-limit
switch.
Actuating
motor
extends
gear
to
Same
causes
as
listed with
Same
remedies
as
listed with
an
"lncomplete
Retraction".
"lncomplete
Retraction" above.
intermediate
position.
Gear
will extend
manually,
but
Gear switch
is
not
in
DOWN
Place
gear
switch
in
DOWN
position.
green
indicator
light
will
not
position.
illuminate.
Lamp
bumed
out
in
green
Replace
bumed
out
lamp.
indicator
light.
Manual
system
will
not
lower
Actuator internal clutch
spring
Replace
spring.
gear.
broken
(Avionics
Products/Eaten
Actuator
only).
Manual
engage
arm
improperly Rig
manual
engage
arm.
rigged.
Sheared
female
spline
in drive
Replace
drive
connector
if
female
spline
connector.
is
stripped.
Drive
connector
is
out
of
rig.
Adjust
control
cable tension
of drive
connector.
Landing
Gear
Actuator
will
not
Any
of the above
or
motor
Applicable
remedy
listed above
or
retract
nor
extend
gear.
brushes
worn.
replace
motor
or
brushes.
32-40-00
WHEELS
AND
BRAKES
NOTE
Bearing
cups
are
shrink
fitted;
do
not
remove
3240-01
MAIN
WHEELS
them
unless
necessary
for
replacement.
The
main
wheels have standard
brand,
6:00
x
6,
Type
5.
Clean all wheel
parts
thoroughly
in
cleaninn
fluid
ill,
six-ply
rated
tires
with
standard
tubes.
(Federal Specification
PS-661).
Exercise
special~
care
To
remove
main
wheel/tire
assemblies:
in
cleaning
bearing
cones
and
felt
rings
to
insure
i.
Remove
MID
gear
door.
(Ref. Figure
32-15)
thorough
cleaning.
2.
Detach dust shield. Remove
three
screws
and
6´•
I"spect
all
parts
for
cracks,
corrosion,
or
evidence
washers.
of
wear.
3.
Remove
2
bolts from
single puck
brake
caliper;
7.
Inspect
bearing
cups
and
replace
if
cups
are
(4
bolts
on
dual
puck caliper).
damaged
or wom.
If
necessary
to
remove
bearing
cups,
heat
wheel
in
boiling
water
for
at
least
30
4.
Remove
wheel
by
removing
cotter
key,
nut
and
minutes.
Then
remove
cup
by
tapping evenly.
spacer
from axle.
(SeeFigure
32-15.)
To install
cup,
heat
wheel
half
again
as
above;
cool
5.
Slide
wheel
off
axle.
cup
with
dry
ice.
Position
cup
and
tap
lightly
to
insure
proper
seating.
32-40-02
MAIN
WHEEL
DISASSEMBLY/
8.
Polish small burrs
or
nicks
out
of wheel
halves
ASSEMBLY
with No.
400
grit sandpaper,
clean
thoroughly,
and
i.
Remove
snap
ring,
(10)
grease
seal
rings,
(8)
and
refinish
protective
coating
as
required.
felt
seals
(9) (See
Figure
32-16).
9.
Replace
bearing
cones
that
show
signs
of
wear or
2.
Remove
bearings
(7).
bearing
fretting.
in.
Repack
wheel
bearings
and
lubricate
seals
with
3.
Completely
deflate
tire.
grease.
Install
bearings,
grease
seal
rings,
and
felt
WARNING
seals
in
wheel halves.
Secure
with
snap
rings.
Do
not
loosen
wheel half
retaining
nuts
before
ii.
Position tire
8
tube
on
wheel
half with valve
stem
tire
is
completely
deflated.
Failure
to
observe
hole;
then
position
other
wheel
half
in tire
to
match
this
warning
may
result
in
bodily injury,
mounting
holes.
4.
Remove
nuts,
washers,
and
wheel
half
retaining
CAUTION
bolts,
(5);
remove
brake disc
(2),
separate
halves,
(3
8 Use
correct
axle
spacer
to
position
brake
disc
4)
and
remove
tire
and
tube.
.12
inches
from
MLG
assy.
4-99
32-40-00
17
OLDWILLWAYNE