QD5 tap-changer main movable contact
replacement kit number 5740785B33
(Refer to Service Information MN225030EN)
General
The purpose of this replacement kit is to provide the parts
and installation instructions for replacing the main movable
contacts on a QD5 Quik-Drive tap-changer.
Parts supplied
Item
Part Number
Description
Qty
1
5740785B33
Main Movable Contact
Replacement Kit
1
Tools required
•
Ratchet Wrench
•
3/4 inch Socket
•
3/8 inch Socket
•
7/16 inch Deep-well Socket
•
9/16 inch Deep-well Socket
•
5/8 inch open end Wrench
•
Torque Wrench 0-300 in-lbs
•
Small-bladed Screwdrivers (2)
•
Bladed Screwdriver
•
5/32 inch hex Wrench
•
Lineman's Pliers
•
Locktite
®
243 Threadlocker
Installation procedure
1. The tap-changer should be secured to a bench before
starting the replacement procedure if the tap-changer
has been removed from the unit.
2. The tap-changer should be in the neutral position before
starting the replacement procedure. Refer to Figure
129. If the tap-changer is not in the neutral position,
turn the shaft on the back of the motor shaft using a
3/8" socket on a ratchet until the QD5 tap-changer is in
the neutral position.
3. Remove the number 1 stationary contact from the
molded panel using a 9/16" deep well socket wrench.
Refer to Figure 130.
Figure 129. Neutral position.
Contacts in
the Neutral
Position
Figure 130. Stationary contact.
Molded
Panel
First Raise
Stationary
Contact
Removed
Neutral
Stationary
Contact
Figure 128. Main movable contact replacement kit.
46
QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS
MN225012EN March 2016
