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MERCURY SWITCH TO MICROSWITCH RETROFIT KIT KA349WE INSTALLATION INSTRUCTIONS
MN280022EN October 2015
Install microswitches SW1 and SW 3 and new switch
cam
Preparing main shaft
1. Block mechanism with a screwdriver or other device to
prevent plungers from descending into main contacts
when tension is relieved (Figure 19).
Figure 18. Mechanism blocked with screwdriver.
2. Detach large lower spring (Figure 20) to relieve tension
on operating mechanism.
Figure 19. Spring attachment in lower part of
mechanism.
3. Remove and discard two large retaining E rings from
main shaft (Figure 21).
4. Remove the machine screw, spacer, and nut that
connect the main shaft to closing contactor toggle.
Figure 20. Items to remove on main shaft.
5. Use punch to remove roll pin holding old SW1 cam.
Discard roll pin. (Figure 21).
6. Remove large roll pin to free shaft. Save roll pin.
7. Slide main shaft aside to gain clearance for removing
old microswitch cam. Note orientation of cam on shaft.
Remove and discard cam.
Install new cam for SW1
1. Slide new switch cam (Item 15) onto main shaft. Orient
cam as shown in Figures 22 and 23.
Figure 21. Orientating cam for switches SW1 and SW3.
Figure 22. Cam installed. Note position of spring and
roll pins.
2. Reinsert main shaft into frame.
3. Use new spring pin (Item 17) from kit to secure cam on
main shaft.
4. Reinsert the saved, large roll pin.
5. Attach two new E rings (Item 16) to main shaft.
6. Reinstall machine screw, spacer, and nut connecting
main shaft to closing contactor toggle.
Large roll pin
Main shaft
Spring pin
Cam
Push down
to position switch
before tightening
Spring Pin
Cavity
Attach cable leads to
Common and Open terminals
(both switches)
Switch SW1
Mounting
bracket
Rotary
Solenoid
Frame
Slotted Hole
Cam flat nearest frame
faces up toward switch
Switch SW3 on far side of bracket
Old switch SW1 cam
Closing contactor toggle
E ring
Main shaft
Large roll pin
