Duff-Norton SK2463-22 (Modular Actuator Acme Screw) - Manual (Page 7)

7
NOTE
For assembly procedures for Translating Tube
actuators, see Paragraph 5-7.
NOTE
Be sure all parts are clean and dry before
assembling the actuator.
1. Assemble one load bearing cup (13) into the shell
(9), and the other load bearing cup into the shell
cap (19).
2. Assemble one worm bearing (2) into the motor
mounting flange end of the shell (9) (see NOTE be-
low).
NOTE
The bearing must be installed from the op-
posite end of the shell.
3. Notice that one end of the worm (4) has a hole in
the center of the shaft, and one end does not. Press
the remaining worm bearing (2) on to the end of the
shaft WITH the hole.
4. Assemble the worm (4) into the shell (9) and worm
bearing (2), and then install the retaining ring (1) in
the shell.
5. Grease the two load bearing cones (13) and install
them on the worm gear (14) bearing journals.
6. Install the stop pin (16) in the end of the lifting screw
(17), taking care to center the pin in the screw.
7. Screw the lifting nut (20) on to the lifting screw (5)
with the flange end away from the stop pin (16).
8. Slide the shell cap and bearing cup assembly over
the lifting screw threads, with the bearing cup (13)
facing the turned end of the lifting screw.
9. Slip the spacer (15) over the end of the lifting screw
(17), with the flange toward the screw thread.
10. Install the key (18) in the keyway in the lifting screw
(17).
11. Slide the gear and load bearing cone assembly over
the end of the lifting screw (17).
12. Thread the lock nut (12) on to the end of the lifting
screw (17). Clamp the lifting screw between soft
jaws in a vise, and tighten the lock nut to 30 ft-lb.
13. Install the lifting screw, shell cap, and gear assem-
bly in the shell (9), taking care to mesh the gear
teeth and the worm properly.
14. Pack the gear housing with Shell Albida LC EP#2
grease.
15. Coat the shell cap (19) threads with aluminum
antiseize compound. Thread the shell cap into the
shell (9), and torque it to 40 ft-lb. Spot drill the shell
cap thread O.D. in two places, and install the two
set screws (10). Tighten the set screws to hold the
shell cap in place.
16. Install the key (6) in the end of the worm (4) shaft
on the flange side of the shell (9), and slide a cou-
pling half (5a) onto the worm shaft. The inside face
of the coupling should be flush with the worm shaft
end. Tighten the coupling set screw (5c) against
the key by inserting the set screw wrench through
the 1/8-inch pipe tap hole in the shell.
17. Install the pipe plug (7).
18. Install the grease fitting (8).
19. Install the key (E) in the motor shaft and slide the
second coupling half (5a) on to the motor shaft, with
the inside face of the coupling flush with the end of
the motor shaft. Tighten the coupling set screw
against the key to lock it in place.
20. Assemble the flexible spider (5b) on to the motor
coupling half (5c).
21. Align the motor coupling half (5a) with the worm
coupling half (5a) and assemble the motor (A) to
the shell (9), aligning the holes in the flange with
the tapped holes in the face of the motor. Make
sure that the motor is centered in the counterbore,
and then install and tighten the four 3/8-16 x 7/8
inch hex head cap screws (B) with lock washers
(F) that attach the motor to the flange. Turn the
worm shaft extension by hand to be certain that
there is no binding of the motor and the actuator.
This completes the assembly procedures for actuators not
equipped with limit switches. When assembling an actua-
tor equipped with limit switches, continue with the
instructions below.
22. Apply two or three drops of Loc-Tite No. 35 Extra
Strength Retaining Ring Compound to the shell
bore.
If a new (replacement) limit switch adapter is being in-
stalled, follow steps 23 and 24 below. If a used (previously
spot drilled) adapter is being installed, proceed directly to
step 25.
23. Install the limit switch adapter (29) in the shell (9),
making sure that the adapter bottoms out against
the retaining ring (1). Orient the four tapped holes
in the limit switch adapter to line up with the four
motor mounting holes in the housing flange.
24. Spot drill the limit switch adapter (29) in two places
and install the two half dog point set screws (30).
Proceed directly to step 27.
25. Install the limit switch adapter (29) in the shell (9),
aligning the spot drilled holes in the adapter with
the tapped holes in the shell.
26. Install the two half dog point set screws (30).
27. Aligning the slot in the limit switch worm shaft with
the pin in the actuator worm, install the limit switch
box on the adapter (29) in the desired position.
Assembly of the actuator is now complete.