18 S&C Instruction Sheet 761-507
Installation
STEP 23. If there is still slack, repeat the procedure in
Step 19 but move the operating handle more than
20 degrees in the opening direction before
torquing the clamp bolt on the lowest rod guide
(or switch drive lever) coupling. See Figure26.
Conversely, if considerable force is needed to
move the handle to the fully Closed posi tion, or
if the handle does not swing 180 degrees to the
fully Open position, loosen the clamp bolt on
the lowest rod guide (or switch drive lever) cou-
pling, and move the handle to a position less than
20 degrees from the Closed position. Then torque
the clamp bolt on the lowest rod guide (or switch
drive lever) coupling. Proper “resistance” in the
operating linkage is essential to ensure positive
switch closure.
Recheck to be sure all clamp bolts and pierc-
ing set screws have been torqued to final tight-
ness.
If a key interlock is not used (standard minor
modification suffix “-S6”) proceed to Step 26 on
page 19.
Installing Key Interlock
STEP 24. The interlock group includes a Superior Type
B4003-1 Mk II single- or multiple-key interlock
(or equivalent), with zero bolt projection and
¾-inch (19-mm) bolt travel, locking disc, and
interlock bracket. If “provision only” is speci ed,
the interlock is not included.
Attach the key interlock to the interlock
bracket so the interlock bolt, when extended,
engages a slot in the locking disc on the operat-
ing handle. See Figure 27.
Figure 26. Torquing the clamp bolt at the lowest rod guide (or
switch operating lever) cou pling.
Clamp bolt
Interlock bolt
Figure 27. Attaching the key interlock to the interlock bracket.
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