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8
10
11
1.
Snap Ring
7.
Piston
2.
Flexible
Shaft
8.
Housing
3.
Piston
Plug
9.
Actuator
Screw
4.
Spacers
10.
"O" Ring
5.
Seal
11.
Pin
6.
Bearing
Figure
5-12. Flap Actuator
shaft (2) from the actuator.
RUDDER
TRIM TAB ACTUATOR
DISASSEMBLY
(Figure 5-13)
I
b.
Tap on the piston
plug (3) to drive out the seal (5),
spacers
(4), and bearings
(6).
NOTE
c.
Slide the piston (7) out of the
housing (8)
and unscrew
If there
is more
than
0.005
inch
end
play
the flap actuator
screw (9) from the piston.
measured
from
the screw (4)
to
the housing,
the
actuator
is not
within
tolerance.
If the end play
d.
Remove the
"O"
ring (10)
from
the housing.
can not
be
reduced
to 0.005 or less
with
the
adjusting
bushing
the nut or screw or both may
e.
Drill
out the pin (11) and
take the
plug out of the piston.
need replaced.
Clean
all parts with
Federal Specification
PD680 solvent and
inspect
for
cracks,
corrosion,
distortion
and excessive
wear.
a.
Remove the snap ring (1)
from
the actuator
housing and
Replace
the
O-ring
and seals.
Coat
the plug and pin
with
zine
pull the nut assembly
(2)
out
of
the housing.
chromate
before
assembly.
Peen
the pin and
file it flush
with
the piston.
Pack
the bearings
with
MIL-G-23827
grease.
b.
Remove
the
actuator
screw (4) from the nut
assembly.
Lubricate the O-rings
with
MIL-L-6086,
Grade M
gear
lube
before inserting the
piston
in the housing.
c.
Drill
out
rivet (5), [on later models remove shoulder pin
(5)] rivet (1!) and remove
actuator
rod end (6) from the
Pour
MIL-L-6086, Grade M
gear
lube into
the piston until it
screw (4).
The bearing (7)
and
bushing
can now be removed
is
about
two inches
from being full. Slide
a
bearing
on the
from
the screw (4).
screw.
Start the
screw
in
the piston and slide the piston into
the housing.
Install
the remaining
bearing
and seal.
Seat
d.
Remove
the
check
nut (9) and screw out the end plug
parts
in
the housing
with
1000
lbs.
pressure.
Install
the
adjusting
bushing
(10)
with
the appropriate
spanner
wrench.
I
spacers,
shaft,
and
snap
ring. Apply
1000
lbs.
reverse
pressure
to seat the parts
against
the snap ring.
End
play
e.
Remove
the
bearing
(3)
from
the nut assembly.
between
the piston and
housing
should
be between
.010-inch
and
.031-inch.
Run the actuator
in
and out
several
times to
Clean
all parts
with
Federal Specification
PD680 solvent and
assure proper operation
in
its
full
travel.
Excessive lubricant
inspect
for
cracks, corrosion
and distortion.
Replace all
"O''
will
be forced
out
of the
vent
hole
the
first
time
the
actuator
rings and
bushings.
Lubricate
all parts with
MIL-G-23827
is run all the
way
up. Install the actuator
with
the
vent
hole
prior
to assembly.
up.
5-18
C3
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Table of Contents
Troubleshooting
