24
S&C Instruction Sheet 761-505
Installation
(g) When satisfactory travel adjustment of the
operating handle and switch have been attained,
torque the bolts on the adjustable lever arm of
the bell-crank and the clamp bolt on the rod
guide (or bell-crank) coupling to fi nal tightness.
Then, tighten the associated piercing set screw,
piercing the pipe, and con tinue turning until a
fi rm resistance is felt. See Figure 31.
NOTICE
After readjusting, be sure to retighten the
locknut on each adjustable pipe-coupling
take-up screw, the clamp bolt and piercing
set screw on the pipe coupling at the rod
guide (or bell-crank) immediately above the
operating handle, and the clamp bolts on the
adjustable lever arm of the bell-crank.
NOTICE
For the most favorable mechanical
advan tage, the bell-crank arms should be
within 5 degrees of the 45-degree position
when the switch is in the
Open position as
well as in the
Closed position.
Adjustable lever arm
Figure 31. Torquing the bolts on the adjustable lever arm of the
bell-crank.
