5. Place a flat washer and nut over each of the reversing
neutral stationary contact studs. Tighten to a torque of
80
–
90 in-lbs (9.0
–
10.2 Nm). See Figure 68.
6. Place the mounting hardware onto the reversing logic
switches and fasten to the tap-changer front plate.
While holding a small screwdriver, tighten the nuts to a
torque of 4
–
5 in-lbs (0.5
–
0.6 Nm). See Figure 69.
7. If not present on the threads, apply Loctite® 243™
threadlocker to the two 1/4-28 bolts. Using the bolts
and a 7/16" wrench, fasten the reversing movable
bushing to the front of the tap-changer. Tighten the
bolts to a torque of 30
–
40 in-lbs (3.4
–
4.5 Nm). See
Figure 70.
8. Place the reversing segment arm onto the reversing
actuator shaft. Align the square portion of the shaft
with the square hole in the arm. If needed, place a
screwdriver through the movable contact tube and
push the shaft forward while seating the arm over
the shaft. It may be necessary to rotate the movable
contact assembly slightly to align the shaft and hole.
See Figures 71 and 72.
Figure 67. Reversing neutral stationary contact fastening.
Figure 69. Reversing logic switch mounting.
Figure 70. Reversing segment gear shaft.
Reversing
Neutral
Stationary
Contact Studs
Reversing
Logic
Switches
4-40
Hex
Nut
4-40x1.25
Screws
1/4-28 Bolts
Reversing
Segment
Shaft
Figure 71. Placement of reversing segment arm.
Reversing
Segment Arm
Reversing Segment
Gear Shaft
27
QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS
MN225012EN March 2016
