Duff-Norton SK2463-22 (Modular Actuator Acme Screw) - Manual (Page 9)

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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. Install the guide bushing (23) and the wiper scraper
seal (22) in the end of the outer tube (24) opposite
the threaded end.
6. Install a load bearing cup (13) in the threaded end
of the outer tube (24).
7. Grease the two load bearing cones (13) and install
them on the worm gear (14) bearing journals.
8. Install the stop pin (16) in the end of the lifting screw
(17), taking care to center the pin in the screw.
9. Screw the lifting nut (19) on to the lifting screw (17)
with the flange end away from the stop pin (16).
10. Fill the translating tube (16) approximately half full
of Shell Albida LC EP#2 grease.
11. (M2464 only) Slide the translating tube and clevis
end assembly over the lifting screw (17) and on to
the lifting nut (19), lining the four holes in the trans-
lating tube up with the four holes in the lifting nut
(19).
Press the four pins (20) into place (see CAUTION
below).
CAUTION
The pins should end up extending 1/32
inch beyond the O.D. of the translating
tube, and must NOT jam against the O.D.
of the lifting screw thread. If the pins are
pressed too far into the lifting nut, they
will bind against the lifting screw thread,
perhaps damaging the screw surface.
NOTE
The lifting nut should now rotate freely on the
lifting screw. If the nut does not rotate freely
on the screw, follow steps 21-24 under Para-
graph 5-6, "Disassembly", and then resume
"Assembly" at step 9.
12. (M2465 only) Clean any grease from the external
threads on lifting nut (SK2465-29) and from the in-
ternal threads on the translating tube and clevis end
assembly. Apply thread locker (Loctite 242) to the
external threads on the lifting nut. Screw the trans-
lating tube and clevis assembly onto the lifting nut.
Use a drill bit to "spot" the lifting nut and install the
set screw (S7-94).
13. Slip the spacer (15) over the end of the lifting screw
(17), with the flange toward the lifting screw shoul-
der.
14. Install the key (18) in the keyway in the lifting screw
(17).
15. Slide the gear and load bearing cone assembly over
the end of the lifting screw (17).
16. 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.
17. Install the lifting screw, translating tube, and gear
assembly in the shell (9), taking care to mesh the
gear teeth and the worm properly.
18. Pack the gear housing with Shell Albida LC EP#2
grease.
19. Make sure that a load bearing cup (13) has been
installed in the end of the outer tube (24) (see step
6). Lightly grease the O.D. of the translating tube
assembly, and slide the outer tube over the trans-
lating tube, threaded end first.
20. Thread the outer tube (24) into the shell (9), and
tighten it to 40 ft-lb. Spot drill the outer tube thread
in two places, and install and tighten the two set
screws (10) to hold the outer tube in place.
21. Install the key (6) in the end of the worm (4) shaft
on the flange side of the shell, and slide a coupling
half (5a) on to 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.
22. Install the pipe plug (7).
23. Install the grease fitting (8).
24. 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.
25. Assemble the flexible spider (5b) on to the motor
coupling half (5c).
26. Align the motor coupling half (5a) with the worm
coupling half (5a) and assemble the motor to the
shell (9), aligning the holes of 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 bind-
ing of the motor and the actuator.