Moving Contact Arm Assembly - Eaton Cooper Power NR Series Maintenance Instructions Manual

Moving contact arm assembly

To replace the moving contact arm assembly proceed as
follows:
1. Detach both opening springs from toggle link (Figure 8).
2. Pull back latch lever assembly and remove C-ring which
secures the toggle link to the bell crank lever.
The latch assembly can be held back with a
N ote:
screwdriver as shown in Figure 9.
3. Remove the pivot pin attaching the contact arm
assembly to the side plates of the contact box.
4. Remove the contact arm assembly.
Toggle link
Bell Crank
Lever
Figure 8. Components of toggle mechanism assembly.
Figure 9. Holding back latch lever with screwdriver.
8 TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS MN230001EN February 2016
5. Reassemble the new contact arm assembly, which
includes the moving contact bar, to the contact box.
Moving
Contact Bar
Measure
1/16 "
Opening Springs
Support Arm
C-Ring
Latch Lever
Figure 10. Contact engagement adjustment (stationary
contact removed to show measuring point).
Hex Head Machine
Screws
Screwdriver
Figure 11. Contact structure removed from head
mechanism.
Contact Arm
Assembly
Operating Link