Duff-Norton SK6905-100-1 - Manual (Page 9)

NOTE
If coupling is not damaged, it need not be removed.
22. If bushing (40) in housing (22) is worn, remove it.
23. If bushing (37) in housing (22) clevis is worn, press
bushing (37) out.
NOTE
If switches (16), switch gear cam (13), switch cam
(11), or gear cam shaft (10) do not have to be
replaced, do not remove. Disassembly of actuator is
complete. If these parts must be removed, proceed as
follows:
24. Remove set screws (14) from switch gear cam (13)
and set screw (12) from switch cam (11). With a
3 /
16
”
diameter punch and hammer, tap on bearing (9) driving
bearings and gear cam shaft (10) out. (Bearings (9) will
be damaged and must be replaced.)
25. Remove screws (15) (potentiometer bracket (6) if
actuator has potentiometer unit), switches (16) with
terminal wires (17, 18, 19, and 20) and insulation (8 and
21) from housing (22). Remove terminal wires (17, 18,
19 and 20) from switches (16).
26. If gear (5) on potentiometer is damaged, it must be
replaced. Remove gear (5) from potentiometer (7) shaft.
Take care to prevent damage to potentiometer.
Disassembly is now complete.
4-5. Assembly
1. Install damper (55) in I.D. coupling (24) and assemble
drive coupling (24) on motor (23) shaft. Align hole in
coupling (24) with hole in motor (23) shaft and install
pin (25).
2. Assemble ball housing (26) on drive coupling (24) and
line up ball cavities with groove in coupling.
3. Fill cavities with Shell Darina EP2 grease.
4. Assemble balls (27), spring (28) and set screw (29)
into ball housing (26).
NOTE
Adjust set screws (29) until torque required to turn
motor (23) shaft and coupling is 22 oz.-in. to 28 oz.-in.
while restraining ball housing (26) from rotating. Set
screws (29) will be approximately flush with OD of
ball housing.
5. Assemble bearing (35) on pinion (36) and install
retaining ring (34) on pinion (36).
6. Apply Loctite retaining compound grade AV (or equal)
to OD of brushing (38) and install in housing (22).
Assemble into housing (22) end opposite side of housing
with 4 holes for mounting motor adaptor (31).
7. Press bushing (37) in housing (22) clevis.
8. Press bushing (40) in housing (22).
9. 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.
10. Install black jumper wires (19) and (20) on opposite
switch (16).
NOTE
Terminal wires with COM. and N.C. markings 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 vice with housing
limit switch box up.
11. 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 1 /
2
” 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).
12. Install bushing (9) in left side of housing (22) switch
box only.
13. 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 of bearing (9) on gear cam shaft (10) and into
right side of housing (22) switch box. [Stake around
bearings (9) to prevent axial movement of gear cam shaft
(10)].
NOTE
Check to ensure that gear cam shaft rotates freely.
14. Thread set screws (14) in switch gear cam (13) and
tighten against gear cam shaft (10) (care should be taken
not to strip threads).
9