S&C Instruction Sheet 1045M-510
33
Installing the Reciprocating Switch Operator
Figure 22. Detail of crank arm assembly viewed from the back of operator.
MOUNTING
CHANNEL
OUTPUT
CRANK
LOCKOUT BRACKET
(FOR MANUAL
OPERATION ONLY)
DECOUPLING
MECHANISM
MANUAL OPERATING
HANDLE (FULL LENGTH
OF HANDLE IS NOT
SHOWN)
1 ¼ IPS THREADED CLEVIS
(CONNECTS OUTPUT CRANK
TO VERTICAL OPERATING
PIPE / ROD)
VERTICAL OPERATING
PIPE / ROD
STEP 11.
Cut the switch operator rod to the proper length. After final adjustments have
been made to the crank arm linkage, the end of the switch operator rod must not
extend below the connecting clamp for a distance greater than
¼
-inch (6 mm).
If the protruding length of the rod is more than
¼
-inch (6 mm) the excess length
should be cut off (see Figure 23). If any excess length is left, it will hit the output
crank and interfere with the operation of the switch.
Figure 23. Checking excess length of control rod, viewed from the back of operator, dimensions
are inches (mm).
(6)
When the switch operator is put in service, the output crank will normally be
under considerable tension. This tension will make it impossible to pull out the
decoupling pin when necessary to make adjustments or to carry out diagnostic
procedures. S&C has provided a convenient way to release the tension on the
output crank and permit the easy withdrawal of the decoupling pin without
loosening the connecting rod and destroying the accurate adjustment of the
switch operator. To release tension on the linkage, remove the indicated bolt
on the output crank yoke (see Figure 24 on page 34). When this bolt is removed,
the linkage will loosen and the decoupling pin can be removed. To reinstall the
decoupling pin, reverse this procedure.
