Finish Thompson MSVKC Series - Manual (Page 3)

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7. Maintain a flooded suction. Use a foot valve if necessary.
8. Ensure that the piping does not leak and suction is not prone to clog-
ging. Use a strainer if necessary on the suction.
9. If flexible hose is preferred, use reinforced hose rated for the proper
temperature and pressure. This helps avoid collapse or kinks.
10. Install valves a minimum of 10 pipe diameters from the pump.
eleCtriCal
Install motor according to NEC requirements and local electrical codes.
Motor should have an overload protection circuit.
Important. To verify the correct motor rotation:
1. Install the pump into the system.
2. Fully open suction and discharge valves.
3. Allow fluid to flow into the pump. Do not allow the pump to run dry
(PTFE & ceramic bushings can not be allowed to run dry
without damage to pump components).
4. Jog the motor (allow it to run for one to two seconds) and observe
rotation of the motor fan. Refer to directional arrow on the pump.
Note: A pump running backwards will pump but at a greatly
reduced flow and pressure.
opeRation
1. Completely open the discharge valve. On pumps equipped with a
discharge check valve, open air bleed valve on initial startup.
2. Start the pump and check liquid flow. If there is no flow, see the
Troubleshooting section.
3. Adjust the flow rate and pressure by regulating the discharge valve.
maintenanCe
5. Inspect the bearing(s) for damage and replace if necessary. To remove
the bearing, unscrew the four retaining screws (item 32) and press
the bearing out (note: the top of the bearing where the set screws are
faces away from the motor). Installation of the new bearing requires
pressing it into the section with the set screws/collar facing away from
the motor, and replacing the retaining screws.
6. Examine all the plastic parts for damage or wear. Replace as needed.
Figure 2
Caution: To stop the pump if prime is lost, use one of the following:
(1) pressure switch on the discharge or (2) motor minder to monitor motor
current.
1. Disconnect the power and remove the wiring.
2. Close the discharge valve and disconnect the piping.
3. Remove the mounting bolts and pull the pump from the tank. Securely
anchor or clamp the motor to a workbench in a horizontal position.
4. Gently tap the locking ring (item 11 closest to pump end) toward the
motor until it is loose. Mark a matching line on the barrier/column
housing adapter (item 16) and the 2nd stage impeller housing (item
20) as a discharge orientation reference during re-assembly. Using a
strap wrench on the barrier/column housing adapter (item 16), turn
it counterclockwise and remove it from the pump column. When it is
unthreaded, pull it straight off to expose the drive magnet assembly
(item 14).
5. Place the pump end / barrier column housing adapter on a clean work
surface with the suction pointing straight up. Remove the six screws
and washers (items 25A,B, & C) from the impeller housing.
examiNatioN/rePlaCemeNt oF Parts
1. Inspect the bushings (items 18A) in both the impeller drive (item 18) and
the impeller drive shaft (item 23). See figure 2. If bushing in impeller
drive (item 18) requires replacement, grip the impeller assembly (items
18 & 19) with the bushing side up, and gently tap the impeller (item
19) off the impeller drive (item 18). Insert a 1/16-inch punch into the
balance hole (inner circle of four holes) on top of the impeller drive (item
18) and gently tap out the bushing. The punch may need to be moved
to a second hole to complete the removal. Install the new bushing by
gently pressing it in until it bottoms out (use a block of wood and a
mallet if necessary). If the bushing in the impeller drive shaft is worn
or cracked, the complete impeller drive shaft with bushing (item 23)
needs to be replaced.
2. Inspect both thrust rings (item 19A) for wear. See figure 2. If replace-
ment is necessary pull the old ring out, align the flat on the new ring
and the seating area and press into place.
disassembly
6. Using a thin bladed screwdriver, gently separate the 1st stage housing
(item 24) from the diffuser (item 22). Remove the 1st stage impeller
housing (item 24) being careful to pull straight off so as not to damage
the ceramic front spindle support. Remove the housing O-ring (item
17). Holding down on the outside of the diffuser assembly (item 22)
with one hand, gently pull the 1st stage impeller/impeller drive shaft
assembly (items 19 & 23) from the pump.
7. Remove the diffuser assembly (item 22) and the diffuser O-ring (item
21) from the top of the 2nd stage impeller housing (item 20). Remove
the 2nd stage impeller housing (item 20), the housing O-ring (item 17),
and the 2nd stage impeller assembly (items 18 & 19) from the barrier/
column-housing adapter (item 16).
8. If further disassembly is required, place a 9/16-inch wrench on the flat
area of the pump shaft (item 13) on the motor side of the drive magnet
assembly (item 14).
Holding the pump shaft with the wrench, remove the locking nut (item
15) by turning it clockwise (left hand thread). After the nut is removed,
unthread the drive magnet assembly (item 14).
9. If the pump is longer than 12 inches, you remove each of the column
extensions (item 30) by doing the following. Loosen the two set screws
on the shaft bearing (item 31), gently tap the locking ring (item 11)
toward the motor, and use the strap wrench to unthread the section.
10. When you are down to the motor adapter (item 9), mark a matching
line on the adapter flange, mounting plate (item 10), and the motor to
be referenced during reassembly. Loosen the setscrews on the shaft
bearing (item 31). Remove the 4 motor adapter bolts and washers (items
6, 7, & 8), the mounting plate (item 10), the motor adapter (item 9), and
the metric motor adapter (item 2) if required. If motor is to be replaced,
remove the coupling insert and coupling half (part of item 29).
Caution: Keep the drive magnet assembly and the impeller drives
away from metal chips or particles
3. Inspect both ceramic housing thrust rings and both the barrier ceramic
post and the 1st stage impeller housing ceramic support post for cracks,
chips, scoring, or excessive wear. Replace as required.
4. Check for loose magnets on the drive hub (item 14) or rubbed areas on
the barrier/column housing adapter (item 16) or impeller assemblies.
Contact your distributor or FTI Technical Service if a problem is found.