Finish Thompson VKC22 Series - Manual (Page 2)

2
OPERATION
1. Partially open the discharge valves.
2. Start the pump and verify liquid is flowing. If there is not
liquid flow, refer to the “Troubleshooting” section of these
instructions.
3. Adjust the flow rate and pressure by regulating the dis-
charge valve.
1. Disconnect the power and remove the electrical wiring.
2. Close the discharge valve and disconnect the piping.
3. Remove the 4 bolts and washers (items 7, 8 and 9), and
pull the motor and motor adapter flange (items 1 and 3)
from the pump. If the motor is to be replaced, remove the
4 bolts and washers (items 4, 5, and 6) from the motor
adapter flange (Item 3) and separate the flange from the
motor. Remove the motor adapter flange o-ring (item 2)
and the mounting plate o-ring (item 14).
IMPELLER DISASSEMBLY
1. To separate the impeller drive (item 16) from the impeller
(item 17), support the impeller in an arbor press using two
5-inch minimum spacer blocks
2. Insert a 1-1/2” diameter plastic or wooden shaft into the
eye of the impeller and press the impeller drive out of the
impeller. See figure 2.
4. Remove the 4 bolts and washers from the bearing hous-
ing (item 12). Install two jackscrews (item 13) into two
jackscrew holes in top of bearing housing and screw them
in until the bolt heads bottom out. Grip the bearing hous-
ing firmly and pull straight out of the column assembly
(item 15). On extended length models, be sure to pull
straight up until the drive hub clears the mounting plate to
avoid damage to the lower bearing housing fingers.
5. Remove the bolts holding the mounting plate to the tank
and remove the pump from the tank. Gently place the pump
on the mounting plate (on a clean surface) with the pump
suction pointing straight up.
6. Remove the 6 housing bolts, loosen the discharge union ,
and remove the impeller housing . Remove the housing o-
ring (item 18), and remove the impeller assembly (items
16 and 17).
INSPECTION
1. Check impeller drive bushing (item 16A) and impeller thrust
washer (item 17A). Replace if cracked, chipped, or scored.
If the minimum groove height in the slotted areas of the
drive bushing or the thrust washer is less than the mini-
mum height recommended (.020), then replace them.
2. If the drive bushing’s inside diameter is more than .780,
then replace it. See figure 1.
3. Check for loose magnets on the drive hub.
4. Check for any signs of rubbing by the drive assembly in-
side the column assembly from the motor end, or signs of
rubbing inside the column assembly by the impeller as-
sembly on the suction side. If there is any sign of rubbing,
contact the factory.
5. Check for bearing wear on the drive shaft (upper and lower
bearings on extended length models).
Figure 2 Figure 2 Figure 2 Figure 2 Figure 2
5” MIN.
Support
Figure 1 Figure 1 Figure 1 Figure 1 Figure 1
. 780 MAX.
.020 MIN.
Maintain a flooded suction at all times. Use a float switch to
turn off the pump at low level
CAUTION: Do not run the pump dry. This pump should
never be started without liquid in the casing as this could
damage the pump. The fluid being transferred by the pump
lubricates the pump components. Even short periods of
running the pump dry could damage the pump. It is
recommended that run dry protection be used. Optional
electrical power monitors are available to help protect
against run dry.
ELECTRICAL CONNECTIONS
1. Perform the motor wiring according to NEC requirements
and local electrical codes.
2. Wire the motor for clockwise rotation when facing the fan
end of the motor.
3. To verify correct motor rotation
a. Install the pump into the system
b. Fully open the discharge valve.
c. Allow fluid to flow into the pump. Do not allow the
pump to run dry, as this may damage to the pump com
ponents.
d. Jog the motor (allow it to run for one to two seconds)
and observe the rotation of the motor fan. Correct ro
tation is clockwise when viewed from the fan end of
the motor. Refer to directional arrow on the pump if
needed.
Note: A pump running backwards will pump, but at a greatly
reduced flow and pressure.
MAINTENANCE
DISASSEMBLY