1008 Handwheel Actuator
Instruction Manual
December 2009
5
3. Position the grooves in the handwheel (key 28)
and yoke (key 26) to mate, then replace the steel
balls (key 33) in the yoke through the threaded hole.
4. Replace the set screw (key 13).
5. Refer to the Installation procedures for
instructions on connecting the valve plug stem to the
actuator stem screw assembly (key 38).
For Sizes 40 & 50:
1. Replace the thrust bearings (key 2) and bearing
seat (key 45) on the stem screw assembly (key 38).
Screw the nut (key 43) on the stem screw assembly.
Note
Verify that the key (key 16) fits into the
slot milled in the yoke (key 26) before
reassembly.
2. Place the stem screw assembly (key 38) in the
yoke (key 26).
3. Replace the bearing retainer (key 44), tightening
so that the thrust bearings (key 2) move freely, then
tighten the set screw (key 13).
4. Place the ball (key 33) in one of the indentations
on the yoke, then place the handwheel (key 28) with
the spring (key 34) over the ball.
5. Replace the lock washer (key 42) and washer
(key 41) on the stem screw assembly (key 38) and
tighten the hex nut (key 14).
6. Refer to the Installation procedures for
instructions on connecting the valve plug stem to the
actuator stem screw assembly (key 38).
For Size 80:
1. If the worm shaft (key 9) was removed during
disassembly:
a. Replace the worm shaft with the ball bearing
(key 8) and the front worm retainer (key 7).
b. Adjust the worm retainer to eliminate end play
(movement of the worm shaft along its axis) while
allowing adequate movement.
c. Tighten the set screw (key 10) on the front
retainer.
2. Replace the ball (key 33), handwheel (key 28),
and handwheel cap (key 32), then tighten the set
screw in the handwheel cap.
3. Replace one of the thrust bearings (key 2) in the
gear case (key 1) making sure that the bearing race
with the smaller inside diameter is adjacent to the
worm gear web.
4. Screw the worm gear (key 3) on the stem screw
assembly (key 38) and place them in the gear case
(key 1).
5. Install the other thrust bearing (key 2) on the
worm gear (key 3), making sure that the bearing
race with the smaller inside diameter is adjacent to
the worm gear web.
6. Replace the bearing and gear retainer (key 4).
7. Install the retaining flange (key 35) making sure
that the key (key 36) fits in the slot on the retaining
flange.
8. Coat the threads on the six set screws (key 13)
with a hard-setting sealant. Adjust the six set screws
to eliminate end play (movement along the axis of
the stem screw assembly) in the thrust bearings,
while allowing adequate movement.
9. Replace the gear case cover (key 11) and cap
screws (key 12).
10. Replace the stem connector assembly (key 24).
11. Refer to the Installation procedures for
instructions on connecting the valve plug stem to the
actuator stem screw assembly (key 38).
For Size 100:
1. If the worm shaft (key 9) was removed during
disassembly:
a. Replace the worm shaft with the ball bearing
(key 8) and the front worm retainer (key 7).
b. Adjust the worm retainer to eliminate end play
(movement of the worm shaft along its axis) while
allowing adequate movement.
c. Tighten the set screw (key 10) on the front
retainer.
2. Replace the key (key 16), handwheel (key 28),
and retaining ring (key 17), then tighten the set
screw in the hub of the handwheel.
3. Replace one of the thrust bearings (key 2) in the
gear case (key 1) making sure that the bearing race
with the smaller inside diameter is adjacent to the
worm gear web.
4. Screw the worm gear (key 3) on the stem screw
assembly (key 38) and place them in the gear case
(key 1).
5. Install the other thrust bearing (key 2) on the
worm gear (key 3), making sure that the bearing
