Duff-Norton SK6415-200 (SPA Series AC) - Manual (Page 8)

21. Remove socket head cap screws (45), lock washers
(46) and disassemble motor (53) from housing
(42).
WARNING
Care must be taken not to damage motor lead wires.
22. Remove “O”-Ring (52) and rubber grommet (50).
23. Disassemble outer tube (55) and slip off over
translating tube and clevis (66).
24. Remove air vent (58), wiper scraper (60) and guide
bushing (59) from outer tube (55).
NOTE
If wiper scraper or guide bushing are not damaged they
should not be removed.
25. Remove set screw (68) from spacer nut (37) and
disassemble spacer nut (37) from screw (62) by
clamping screw (62) between soft jawed vise.
WARNING
Care must be taken not to damage bearing journal of
spacer nut (37).
26. Remove output gear (39), key (40), thrust washers
(35), thrust bearing (36), and gear spacer (43).
27. Remove screw (62), translating tube and
clevis (66) and nut assembly (64).
28. Remove washer (44) from screw (62).
29. Thread screw (62) into the translating tube until the
screw bottoms out and cannot rotate farther, or
until the screw thread becomes disengaged
from the lifting nut thread (64).
30. Drive the four pins (65) just far enough into the
lifting nut (64) to clear the translating tube wall;
then remove the translating tube from the nut.
31. Remove the lifting screw (62) from the lifting nut (64).
32. Remove the four pins (65) by pressing each one the
rest of the way through the lifting nut wall.
33. Remove the stop pin (63) from the lifting screw (62)
if necessary.
34. Removing the brake (49) .(Required only if drift is
excessive. If brake removal is not necessary,
proceed to Step 35).
a. Push on the pinion(29) and coupling (47) until
it slips back enough to make the spring (49)
tang accessible.
b. Remove the spring (49) by grabbing the tang
with pliers and twisting out. (Spring must now
be replaced and can no longer be used.)
c. Remove the brake insert (51). Remove
retaining ring (48) from input pinion (29). Input
pinion (29) and bearing (30) can now be
removed from housing (42).
d. The brake inset (51) has straight knurls on its
O.D. which prevent it from rotating. Therefore,
the insert can only be removed by pulling
straight out.
e. One method of removing the insert (51) is to
use a blind hole bearing puller. This tool
expands into the internal spring cavity and pulls
against the lip of the insert (51).
35. If coupling (47) on motor (53) shaft must be
replaced, remove retaining ring (48) from motor
(53) shaft and remove coupling (47).
DISASSEMBLY IS COMPLETE.
4-5. ASSEMBLY
Assemble the actuator as follows while referring to
Figure 5-1. Read instructions thoroughly before
assembling.
NOTE
Be sure all components are clean and dry before
assembling.
1. Assemble coupling (47) on motor shaft, then install
retaining ring (48) on motor shaft.
2. Press bearing (30) on input pinion (29) (press load
should be applied to inner race of bearing to
avoid damage to bearing).
3. Press bushing (34) into housing (42).
4. Install input pinion (29) and bearing assembly (30) in
housing (42) (press load should be applied to
outer ring of bearing to prevent damage to
bearing).
5. Assemble coupling (47) on input pinion (29) and
install retaining ring (48).
6. Brake Assembly
a. Grease O.D. of spring (49) and pocket of
insert (51) (chamfered end) with Aeroshell #6
grease.
CAUTION
When using replacement parts, make sure you have
correct spring. (Part No. SK-6415-18). Red spring
designates DC unit. If your replacement spring is red,
contact your local distributor or the Duff-Norton Factory
for immediate replacement.
b. Install spring (49) into insert (51) pocket
(chamfered end).
c. Align pinion coupling (47) and spring (49) as
shown in Figure 6-1A and press insert (51) and
spring (49) assembly into housing (42)
(alignment must be as shown in Figure 6-1A).
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6415-200 manual 10/10/06 11:46 AM Page 8