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3
8 inches,
remove
the
floating
piston
and add more
assembly.
fluid
to
the piston
rod.
OVERHAUL
OF BRAKE
MASTER
CYLINDER
b.
Remove
the
elbow (2) from
the
valve
seat-
(Figure
5-9)
c. Remove
the
spring
(3),
Washer
(4) and ball (5) from
the
valve
seat,
a.
Remove
the
snap
ring
(1)
and pull
the
assembled
piston
out
of
the
brake
cylinder.(2).
d. Remove
the
lock washer
(9) from
the
pin
through
the
brake
valve handle,
remove
the
spacers
(7) on
the
arm
b.
Remove
the
clevis
(3) from
the
piston
(14),
also
and push
the
plunger
(6)
through housing
and out
through
the
thin
check
nut (4),
this
will free
the
washer
(5),
the
valve
seat
bore.
piston
guide
bushing
(6),
retainer
"O" ring
(7) and the
rear
seat
washer
(8) from
the
piston
(14).
e. Remove
the
old "O" ring (10) from
the
inside
of
the
brake
housing,
c.
Remove
the
cotter
pin (9) from
the
collar
(10)
and
pull
the
collar
from
the
piston.
f.
Clean
all parts
in solvent
and air
dry all parts,
d. Remove
the
cotter
pin (11) from
the
plunger
end of
g. Place
a new "O" ring (10) inside
the
brake
housing.
the
piston
and
allow
the
flow lock piston
(12)
to
come
free.
Remove
the
valve
stop
(17)
and spring
washer
h. Check
the
valve seat for wear and distortion
around
(16). The return
spring
(13) will fall free
of
the
cylinder
the
ball seat.
If necessary
replace
the
valve
seat.
with
the
piston
removed.
i. Reassemble
the
valve
in reverse
of
the
above pro-
Clean
all parts
with PD-680
solvent.
Check
all parts
cedure.
for cracks,
corrosion,
distortion
and
wear.
Replace
all washers
and
seals
at reassembly.
Reassemble
in
Check
the
parking
brake
valve for leaks
by placing
1500
reverse
of
the
above
stated
procedure.
Lubricate
all
lbs. pressure
in
the
valve
through the
elbow
(2). Remove
parts
with MIL-H-5606
hydraulic
fluid prior
to
assem-
the
pressure
and place
it in
the
nozzl.e
(8). The valve
bly.
should open with application
of
2 lbs.
pressure
or less.
If
this
is not
the
case,
the
valve
is not
serviceable.
FLAP
MOTOR GEARBOX
OVERHAUL
(Figure
5-11)
a.
Cut and remove
all safety
wires.
b.
Remove
the two
long
screws
from
the
motor
brush
4
housing
to
separate
the
motor
and
gearbox.
c.
Remove
the
screws
which secure
the
cover
(8)
and
2
gasket
(7)
to the
gear
housing.
d. A small set screw
(11) must
be removed
to
allow
the
counter
shaft
(10)
to
be
drawn out of
the
gearbox.
e.
Take out
the
worm and gear
(14),
Washers
(12, 15),
bearing
(16) and
bearing cup
(17).
/
10
1
f.
Remove
the
retaining
pin
(24) from
the
control
shaft
(20)
and
slip
the
spacer
(21)
and
washer
(22) down
enough
to
remove
the
shaft.
1.
Valve
Seat
Clean
all parts
in
solvent
PD-680
and
inspect
for
2.
Elbow
worn,
cracked
or corroded
components.
Pay parti-
3. Spring
cular attention to the
worm
and worm
wheel
gear
4.
Washer
(19) and
the
bearings
(9)
in
the
side of
the
gearbox.
5.
Ball
Inspect
the
brushes
of
the
flap motor
for wear.
The
6.
Plunger
original length of
the
brushes
are
1/2
inch; if
the
7. Spacers
length
is less
than
5/16
inch
they
should
be replaced.
8.
Nozzle
Refer
to
Aircraft
Parts
Catalog
for replacement
9. Lock Washer
brushes.
Fill
the
gearbox
with
lubricating
grease
10.
"O" Ring
MIL-G-23827.
Figure
5-10.
Parking
Brake
Valve
Assembly
is accomplished
by reversing
the
above pro-
cedure.
PARKING
BRAKE
VALVE
OVERHAUL
(Figure
5-10)
FLAP
ACTUATOR
OVERHAUL
(Figure
5-12)
a.
Remove
the
valve
seat (1) from
the
parking
brake
a.
Remove
the
snap
ring
(1) to
disconnect
the
flexible
5-16
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Table of Contents
Troubleshooting
