Duff-Norton SK6905-200 User Manual

Page 8

equivalent) to OD of bushing (34) and install in hous-
ing (22). Assemble into housing (22) end opposite
side of housing with 4 holes for mounting motor
adapter (29).

Press bushing (33) in housing (22) clevis.

Press bushing (36) in housing (22).

Install red jumper wires (17) and (18) on limit switch
(16) (jumper wire 18 with flag terminal on N.C. spade
of switch 16). See Figure 6.2.

NOTE

COM. and N.C. markings on terminal wires.

Install black jumper wires (19) and (20) on opposite
switch (16).

NOTE

Terminal wires with COM. and N.C. mark-
ings must be connected to identically marked
switch terminals.

Assembly of limit switch components in housing. Refer to
Figure 5.1.

NOTE

Housing (22) should be in a soft-jaw vise with
housing limit switch box up.

Place insulation (21) in housing (22) limit switch box.
Install switches (16) with screws (15) (N.O. and N.C.
terminals should be facing to top of box. Common
contact should face toward sides of box away from
center).

Feed terminal wires thru

" tapped hole to outside

of housing.

If actuator has potentiometer feature, potentiometer
bracket (6) should be installed on top of left hand
switch (16) (switch with red terminal wires).

Install bushing (9) in left side of housing (22) switch
box only.

10. Insert gear cam shaft (10) into switch box from right

side of box assembling switch cam (11) and switch
gear cam (13) on shaft. Position cams between
switches with switch gear cam on left and switch
cam on right. Insert left end of gear cam shaft (10)
in bearing (9) and install right side bearing (9) on
gear cam shaft (10) and into right side of housing
(22) switch box. [Stake around bearing (9) to pre-
vent axial movement of gear cam shaft (10)]

NOTE

Check to ensure that gear cam shaft rotates
freely.

11. Thread set screws (14) in switch gear cam (13) and

tighten against gear cam shaft (10) (care should be
taken not to strip threads).

NOTE

Rotate gear cam shaft to make sure that
switch gear cam is properly located and acti-
vates switch.

12. Thread set screw (12) in switch cam (11). Tighten

lightly against shaft to prevent movement.

13. Install pinion (32) and pinion bearing (31) into hous-

ing (22).

14. Assemble motor adapter (29) onto housing (22)

holding in place with screws (28).

15. Press bushing (42) into outer tube (41). Press seal

(43) in outer tube (41). Seal lip should be facing
inward.

16. Assemble nut (48) on screw (46). Flange of nut (48)

must face towards turned end of screw (46).

17. Install stop pin (47) into screw (46) taking care to

center pin.

18. Fill translating tube (50) approximately half full with

Shell Darina EP2 grease.

19. Assemble nut (48) into translating tube (50) and

align holes in translating tube with holes in nut. In-
stall pins (49). Pins should be 1/32 inch above OD
of tube.

20. Assemble washer (40) on screw (46).

21. Assemble bearing (39) on gear (37) and assemble

on screw (46). Align slot in gear (37) with hole in
screw (46) and install pin (38). Pin should be cen-
tered when assembled. Be careful not to damage
gear teeth.

22. Assemble worm (44) and pin (45) assembly in screw

(46).

23. Assemble worm (44) on pin (45). 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.

24. Clamp housing (22) in vise (use soft jaws gear cav-

ity up). Fill cavity approximately to centerline of pin-
ion (32) with Shell Darina EP2 grease.

25. Assemble translating tube (50), bearing (39) and

gear (37) assembly into housing. Take care not to
damage gear (37) teeth. Rotate pinion (32) while
assembling to be sure of proper mesh gear (37)
teeth with pinion (32) thread.

NOTE

Also check mesh of worm (44) with switch
gear cam (13).

26. Grease OD of translating tube (50) with Shell Darina

EP2 grease.

27. With translating tube (50) extended approximately

" to 4" from washer (40), assemble outer tube

(41) on translating tube (50) and thread outer tube