13. Position and center the movable contact panel
assembly in the molded panel cavity with the contact
rings facing the molded panel. Locate the movable
contacts in the area of the removed stationary contact.
Rotate the movable contact panel and slide the
movable contacts onto the neutral stationary contact.
Align the contact rings with the button contacts. Refer
to Figure 143.
14. For the outer contact ring, spread the button contacts
using a bladed screwdriver and insert the contact ring
between the contact buttons. See Figure 142.
15. For the inner contact ring, from the back of the molded
panel, insert a small blade screwdriver between the
button contact spring and the button contact shunt on
each side of the contact. Refer to Figure 143.
12. The two replacement movable contact assemblies
are identical; therefore, they can be installed in either
position on the movable contact panel. Position one of
the replacement movable contact assemblies between
the contact ring and the movable contact panel and
align the holes. Insert the three button head screws
from the contact ring side of the assembly so the
screw heads secure the contact ring in place. On the
side opposite the contact ring, place a flat washer on
all three screws. Place a Belleville washer on the center
screw and thread a Nylok® nut onto all three screws.
Tighten the Nylok® nuts to 65 to 75 in-lbs (7.3–8.5 Nm)
using a 7/16" deep well socket wrench while holding
the screw in place with a 5/32" hex wrench. Refer to
Figures 140 and 141. Repeat this procedure for the
other movable contact assembly.
Figure 140. Removal of contacts.
Nut and Flat
Washer
Center Screw with
Nut, Flat Washer
and Belleville
Washer
Figure 143. Installing rings into P1 and P2.
Button Contact Shunt
Small Blade
Screwdriver
Button
Contact
Spring
Figure 141. Installation of movable contacts and of
rings.
Movable Contacts
on Stationary Neu-
tral Contact
Contact Ring Aligned with
Button Contact
Figure 142. Inserting the outer contact ring between the
button contacts.
49
QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS
MN225012EN March 2016
