S260-20-8
9
Figure 17.
Wiring diagram with accessory connections indicated
by broken lines.
Figure 16.
Standard actuator mechanism.
89994KMA
4. To replace contact structure:
A. Slip toggle link over bell crank lever and secure with C-
ring.
B. Attach contact structure to head casting with four hex
head machine screws with lockwashers.
C. Attach opening springs to toggle link.
D. Install moving and stationary contact assemblies, if nec-
essary, as described previously.
E. Attach terminal leads to bushing rods with flatwashers,
lockwashers and hex nuts.
Actuator Mechanism
The actuator mechanism requires little attention. When the
switch is removed from service for its periodic maintenance
inspection, check the condition of the selector switch contacts,
and holding switch contacts if so equipped. Also check the
condition of the wiring, motor and cams. Components of a
standard actuator mechanism are shown in Figure 16. Figure
17 shows the wiring diagram of the switch actuator with the
various accessory connections shown in dotted lines.
SELECTOR AND HOLDING SWITCHES
To replace the selector switch, or holding switch if so
equipped, proceed as follows:
1. Heat the solder joint at the common terminal of the selec-
tor switch to disconnect black lead (See Figure 16). Use a
gun rated no higher than 100 watts and use only 50-50 or
40-60 rosin core solder for repair work.
2. Disconnect leads from terminal strip: red and black from
terminals 2 and 3 for selector switch, green from terminal
1 for holding switch.
3. Remove two round head screws with lockwashers that
secure the switch to the support bracket. Mounting spac-
ers and a nut bracket (on underside of support) will also
be released.
4. Attach new switch to support bracket, securing it loosely
with two round head screws so that it is free to move for
adjustment.
