Piper Cherokee Six - Page 279

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
6-23.
ASSEMBLY
AND
INSTALLATION
OF
NOSE
WHEEL.
(Refer
to
Figure
6-8.)
a.
Ascertain
that
the
bearing
cup
for
each
wheel
half
is
properly
installed.
Ascertain
that
the
index
mark
on
the
tube
is
aligned
with
the
index
mark
on
the
tire
to
insure
proper
tire,
tube
and
wheel
balance.
Join
the
two
wheel
halves
and
install
the
through
bolts
with
washers
and
nuts.
Torque
the
nuts
to
torque
indicated
on
the
wheel
and
inflate
tire.
(Refer
to
Table
II-I
Section
II.)
b.
Lubricate
the
bearing
cone
and
install
the
cone,
retainer,
grease
seal,
retainer
and
retaining
ring.
c.
Replace
the
wheel
fairing
by
turning
sideways
and
slipping
it up
over
the
fork
assembly.
d.
Place
the
spacer
tubes
one
on
each
side
of
the
wheel
and
install
unit
in
fork.
Align
and
slide
the
axle
tube
through
the
spacer
tubes
and
wheel
assembly.
Reinstall
the
axle
plugs
and
rod
with
washer
and
nut.
Tighten
the
nuts
until
no
side
play
is
felt,
yet
allowing
the
wheel
to
rotate
freely.
e.
Turn
fairing
so
it
will
fall
into
place
and
reinstall
it
with
the
four
bolts
and
screws
in
the
small
plate.
6-24.
REMOVAL
AND
DISASSEMBLY
OF
MAIN
WHEEL.
(Refer
to
Figure
6-9.)
a.
Place
the
airplane
on
jacks.
(Refer
to
Jacking,
Section
II.)
b.
To
remove
the
main
wheel,
remove
the
cap
bolts
that
join
the
brake
cylinder
housing
and
the
lining
back
plate
assemblies.
Remove
the
back
plate
from
between
brake
disc
and
wheel.
c.
Remove
the
dust
cover,
the
cotter
pin
and
flat
head
pin
that
safeties
the
wheel
nut,
and
the
wheel
nut.
Slide
the
wheel
from
the
axle.
d.
The
wheel
halves
(I
and
2)
may
be
separated
by
first
deflating
the
tire.
With
the
tire
sufficiently
deflated,
remove
the
wheel
through
bolts
(9).
Pull
the
wheel
halves
from
the
tire
by
removing
the
inner
half
from
the
tire
first,
and
then
the
outer
half.
e.
The
wheel
bearing
assemblies
may
be
removed
from
each
wheel
half
by
first
removing
the
retainer
snap
rings
(13)
that
secure
the
grease
seal
retainers
(12
or
15),
and
then
the
retainers,
grease
seals
(14)
and
bearing
cone
(1
1).
The
bearing
cups
(10)
should
be
removed
only
for
replacement.
See
paragraph
6-26a
for
bearing
cup
replacement
instructions.
6-25.
INSPECTION
OF
MAIN
WHEEL
ASSEMBLY.
Inspect
brake
disc
for
cracks,
excessive
wear
or
scoring,
rust,
corrosion
and
warpage.
Remove
rust
and
blend
out
nicks,
using
fine
400
grit
sandpaper.
Replace
disc
if
cracked
or
when
disc
is
worn
below
minimum
thickness.
(Refer
to
paragraph
6-31.)
In
addition
also
perform
the
same
inspection
given
for
nose
wheel
in
paragraph
6-22.
At
each
periodic
maintenance
inspection,
brake
disc
p/n
164-46
used
on
wheel
assembly
40-
120,
should
be
inspected
for
the
development
of
heat
checks
on
the
wearing
surface.
The
brake
disc
should
be
replaced
if
the
crack
length
exceeds
.800
or
if
the
crack
depth
exceeds
.210
inch.
If
the
crack
depth
is
not
measurable,
replace
the
disc
if
the
crack
length
exceeds
.400.
Any
crack
which
extends
into
the
welded
seam
between
the
flange
and
cup
is
cause
for
immediate
replacement
of
the
disc.
LANDING
GEAR
AND
BRAKE
SYSTEM
Revised:
12/15/80
2B3