Bushing Replacement; Motor Replacement - Finish Thompson VKC5.5 Series Installation And Maintenance Instructions Manual

BUSHING REPLACEMENT

1. To remove the bushing, insert 1/16" pin punch into balance hole (inner
circle of 4 holes) of impeller assembly (items 17,18,19,20). Gently
tap the bushing out of the back of the impeller assembly. The punch
may need to be moved to a different hole if the bushing is difficult to
remove.
2. To replace the bushing, clean the impeller bore. Insert the new bushing
into the back of the impeller assembly by aligning the bushing with
the impeller bore. Press gently until the bushing bottoms out (use a
block of wood and mallet if necessary).

MOTOR REPLACEMENT

Remove the four bolts and washers (items 6, 7, and 8) securing the
motor adapter (item 9) to the motor. Carefully pull the pump away
from the motor face. Loosen the two setscrews on the coupling
half (located on the motor shaft). Remove the coupling half. Install
motor shaft coupling half onto a new motor following the assembly
instructions on page one for 56C or metric frame pumps. Make
sure the coupling insert meshes. Install pump onto the new motor.
DRIVE MAGNET ASSEMBLY, SHAFT BEARING
OR COLUMN SECTION REPLACEMENT
1. The drive magnet assembly (item 14) is locked in place with a left
hand threaded 5/8-18 jam nut (item 32). Loctite Thread Locker #262
is used to secure the jam nut and may require some heat to loosen
the bond for removal. Secure the pump shaft using the flats located
on the motor side of the drive magnet assembly, and remove the jam
nut. Unthread the drive magnet assembly (left hand thread) from the
shaft.
2. Loosen the two setscrews on the shaft bearing (item 28). Gently tap
the next locking ring (item 11) toward the motor until it is loose. Using
a strap wrench, unthread and remove the column extension (item 30).
Repeat step two for each section removed.
3. When you are down to the motor adapter section (item 9), remove the
four bolts holding the adapter (and mounting plate if you have one) to
the motor. Mark the flange on the motor adapter / mounting plate and
the motor face for correct orientation when reassembling. Remove
the mounting plate, and pull the motor adapter from the motor face.
4. 12" models will have two bearings in the motor adapter section. If
further disassembly is necessary, loosen the two setscrews on the
pump side bearing, and gently press the shaft and the second bear-
ing toward the motor end until it loosens. If the bearing or the shaft
need replacement, loosen the setscrews and remove the pump shaft
coupling half. Loosen the setscrews on the bearing and slide it off the
shaft. On models 18" or longer, just loosen the setscrews on the pump
shaft coupling half and remove it.
5. Spin all of the bearings and visually inspect for binding or corrosion.
To replace, remove the four screws and washers (items 29 and 33).
Gently tap the bearings toward the pump end of each section until they
are loose.
6. Inspect the drive magnet assembly, each column section, all of the bear-
ings, shaft, and o-rings for wear or damage. Replace as needed.
Figure 2
REASSEMBLY
1. If the shaft, or the first bearing on a 12" model was replaced, you will
need to slide the new bearing onto the shaft with the setscrew side
facing away from the motor. Adjust the bearing to the correct setting
in Figure 3, and tighten both setscrews.
Pump
VKC6/8/10
VKC6/8/10
VKC6/8/10
VKC6/8/10
2. Install the key into the keyway cut in the motor end of the pump shaft
(item 13). Align the coupling half keyway slot and install the coupling
half with the splines pointing toward the motor end. For 56C frame, set
the coupling with the shaft end recessed .218". Tighten the setscrews.
For 63 and 71 frames, set the coupling with the shaft end recessed
.437" and tighten the setscrews. For 80 frame, set the coupling with
the shaft recessed .250 and tighten the setscrews.
3. For 12" models - from the motor side, insert the threaded end of the
shaft up through the center of the motor adapter (item 9) . Press the
bearing into the machined recess making sure to use the outer bearing
race as the point of contact.
For models 18" or longer, insert the threaded end of the pump shaft
up through the bearing already in place in the pump end of the motor
adapter. Leave the bearing setscrews loose.
4. For metric frame pumps, install the metric motor adapter flange (item
2) per instructions in step 4 of "Pumps Without Motors (Metric Frame)
from page 1.
5. Install the coupling insert onto the pump shaft coupling half. Place
motor on its fan cover on a flat clean area. Make sure the coupling
splines mesh with the insert. Install the motor adapter and pump shaft
onto the motor face. Verify the motor adapter seats completely onto
the motor rabbet (or metric motor adapter flange on metric pumps).
Install the mounting plate (if one is used) and align the marks on the
motor, the motor adapter flange and the mounting plate for correct
orientation. Install the four bolts and tighten to the motor face.
6. For 12" models, go to step 8. For models 18" or longer, rotate the
pump shaft and press down to insure complete coupling engagement.
While holding the shaft snugly down, tighten the bearing setscrews.
7. If column o-rings (item 12) were removed or need replacement,
lubricate the o-rings with a compatible lubricant and install them in
the o-ring grooves. If the bearing (item 28) was removed, press the
new bearing (only making contact with the outer bearing race) into
the recess with the extended race (setscrews) facing away from the
motor. Install the four retaining screws and washers (items 29 and 33).
8. Lubricate the motor adapter o-rings (item 12) with a compatible lubri-
cant. Place the locking ring (item 11) (with the smaller inside diameter
side toward the motor) over the end of the column section and slide
it toward the motor. Install the column extension (item 30) by aligning
the threaded end of the shaft through the bearing and sliding it down
to the top of the motor adapter. Secure the motor and mounting plate
to the table. Using a strap wrench, thread the column extension onto
the motor adapter. Tighten the section until there is no gap between the
sections and the flats are parallel. Tighten the two bearing setscrews
4
Figure 3
Motor Frame Dim. A"
56C 0.95"
80 2.41"
71 2.19"
63 2.40"