Duff-Norton SK6905-100-1 - Manual (Page 10)

NOTE
Rotate gear cam shaft to make sure that switch gear
cam is properly located and activates switch.
15. Thread set screw (12) in switch cam (11). Tighten
lightly against shaft to prevent movement.
16. Install pinion (36) and pinion bearing (35) into
housing (22).
17. Assemble motor adaptor (31) onto housing (22)
holding in place with screws (30).
18. Press bushing (46) into outer tube (45). Press seal
(47) in outer tube (45). Seal lip should be facing inward.
19. Assemble nut (52) on screw (50). Flange of nut (52)
must face towards turned end of screw (50).
20. Install stop pin (51) into screw (50) taking care to
center pin.
21. Fill translating tube (54) approximately half full with
Shell Darina EP2 grease.
22. Assemble nut (52) into translating tube (54) and align
holes in translating tube with holes in nut. Install pins
(53). Pins should be
1 / 32 inch above OD of tube.
23. Assemble washer (44) on screw (50).
24. Assemble bearing (43) on gear (41) and assemble on
screw (50). Align slot in gear (41) with hole in screw
(50) and install pin (42) . Pin should be centered when
assembled. Take care not to damage gear teeth.
25. Assemble worm (48) and pin (49) assembly in screw
(50) using Loctite Primer T or equal (DN #H-9017) [and
Loctite Adhesive Grade 680 or equal (DN #H-9018)].
Apply primer and adhesive to pin (48) end away from
worm.
26. Assemble worm (48) on pin (49). Worm end with
hex I.D. must be flush with end of pin.
NOTE
Pin dia. and hole in end of screw must be clean and
free of dirt, oil and grease.
27. Clamp housing (22) in vice (use soft jaws gear cavity
up). Fill cavity approximately to centerline of pinion
(36) with Shell Darina EP2 grease.
28. Assemble translating tube (54), bearing (43) and
gear (41) assembly into housing. Take care not to
damage gear (41) teeth. Rotate pinion (36) while
assembling to be sure of proper mesh of gear (41) teeth
with pinion (36) thread.
NOTE
Also check mesh of worm (48) with switch gear cam
(13).
29. Grease OD of translating tube (54) with Shell
Darina EP2 grease.
30. With translating tube (54) extended approximately 3
1 / 2 ” to 4” from washer (44), assemble outer tube (45) on
translating tube (54) and thread outer tube (45) into
housing (22) against bearing (43). Torque in place at 40
± 10 foot pounds.
31. Spot drill outer tube (45) through set screw hole (use
drill slightly smaller than ID of thread). Remove chips
and install set screw (39) and lock in place against outer
tube (45).
32. Assembly of Motor:
Align keyway in ball housing (26) and coupling (24)
flats with key in motor adapter (31) and flats of pinion
(35), assemble motor (23) on motor adaptors (31) and
secure in place with socket head cap screws (33) and
lockwasher (32).
If unit has potentiometer assembly, which does not
have to be replaced, or unit has no potentiometer,
proceed to step 34.
33. Potentiometer Assembly:
a. Assemble washer (7b) and nut (7a) on
potentiometer (7) (nut should not be tightened).
b. Assemble gear (5) on potentiometer (7) shaft.
NOTE
Gear should be assembled on potentiometer shaft
with a very light press fit. See sketch for required
dimensions of gear on potentiometer. Take care not
to damage potentiometer.
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