Mooney M20B - Landing Gear Rigging Procedure

2.
Check
the
i-.ttenal
diameter
of the felt
grease
seals.
Replace
the felt
grease
seal
if
surface
is
hard
or
gritty.
3.
Inspect
the
castilld
for
visible
signs
of
c-acks
or
corrosion.
If
there
are
any
indications
of
cracks,
the
tire and
tube
should
be
removed
and the wheel
dis-
assembled
for
a
closer
inspection
of
the
sns~icious
area.
4.
Replace
any
wheel
casting havingvisiblecracks.
F.
LANDING
GEAR
RIGGING
PROCEDURE
First,
an
important
feature
of
the‘
Mosney
M
20B
gear
down locks.
The
tubes
and
linkages
of
the
retraction
system
are
designed
to
hold
the
overcenter
locking
mechanism
in
its
overcenter
position
~nly.
The
retraction
tubes
and
linkages
will
not take
the loads
imposed
upon
them
if
the
overc~nter
locks
become
diseng´•aged,
This
can
happen
in
two
ways.
One,
by
improper
ad-
justm2nt
of
the
overcenter
lock
mechanism.
Two,
by
disengaging
the
retraction
handle
from its
down lock
block under the
instrument
panel
which~
may
make it
possible
for the
overcenter
linkage
to
be
tripped.
If
either
of the
possibilities
stated
above
should
occur,
it
will
probably
result
in
the
collapse
of
the
nose
gear
with
subsequent
damage~
to
the
airplane.
1.
Rigging
Instructions.
a
Hoist
Airplane
and
remove
access
gsnels
shomn
in
fignre
13B.
b.
Remove retraction
handle
(5039)
from
gear
down lock. Tie handle
loosely
to
prevent
bangee
from
forcing
it
down.In
order to
prevent
damage
to
retraction
tubes,
do
not
move
gear
legs
from
outside until
step
3
has
been
accomplished.
c
Disconnect retraction
tubes
(524?1)(2)
and
(5085)(2)
at
point
B
(fig.
13B).
Loosen
check
nuts
on
helms
on
´•tubes
(5242)(2)
at
point
E
and
on
tubes
(5085)(2)
at
point
A.
d. Check
nose
gear
and
main
g.ears
(2)
for
any
binding
at
hinge
points
designated by
a
star
in
figure
13B
by moving
gear
legs
back
and
forth
by
hand.
Tubes
(5244)~
may
be
disconnected at
point
C
during
check
of
main
gear
if
dCired.
For
easy
g~ar
retraction,
the
points
indicated
should
be lubricated
in
accordance with lubrication
chart
on
page
15.
a
Place
retraction
handle
(5039)
in
gear-down
lock.
Check
for
and
remove
any
foreign
matter
between
retraction
trusses
and links
at
point
Z
and
point
S
(fig.
13A)
and
place
all
gears
in
the
down and lock
position.
It
is
recommer;ded
that
a
C-clamp
be
used
at
point
X
and
point
R
(fig.
13A)
clamping
retraction
trusses
solidly
to
retfac-
tion
links
in
the full
overcenter
position.
f.
By
tuning
tubes,
adjust
retraction tubes
(5242)(2)
and
(5085)(2)
so
that
a
3/16"
D bolt
can
be
inserted
through
retraction lever
(5059)
and helm
bearings
at
point
B
(fig.
13B).
This will
give
a ten,
pre-load
in´•
system
with
the
handlein the
gear
down
lock.
g.
By
turni~lg
tubes,
shorten
retraction
tubes
(5085)(2)
two
turns
and
lengthen
re-´•
traction
tubes
(5242)(2)
two
to
two
and
one-half
turns.
Tighten
check
nuts
(4)
at
points
A
and
E
(fig.
13B).
*F~
h.
Remove
retraction
handle
(5039)
from
gear
down
rock and
connect
tubes
(5242)
and
tubes
(5085).
Place retraction
handle
(5039)
in
gear
down lock.
2.
Inspection
of
System
Pre-Load.
a
Nose Gear
(See
figure
138).
1.
Place
rigging
tool
(8442)
on
retraction
link
(5032)
with
sloped edge
aft.
Hold
tool in
place against
retraction link
(5032).
2.
Plrce
finger at_point
R.
´•3
-32-
Q´•
OLDWILLWAYNE