Finish Thompson KC3, 4, & 5 SERIES - Manual (Page 2)

2
MAINTENANCE MAINTENANCE MAINTENANCE MAINTENANCE MAINTENANCE
DISASSEMBLY
1. Disconnect power. Remove electrical wiring and motor mount-
ing bolts.
2. Close suction and discharge valves. Disconnect piping.
3. Remove nuts, lock washers and flat washers from motor studs.
4. Pull the pump assembly (items 1, 2 ,2A, 3, 5, 6) off the motor.
5. Remove the screws (item 6) holding the pump assembly
together and separate the impeller housing (item 1) from the
barrier assembly (item 3).
6. Remove the drive magnet assembly (item 4), if necessary, to
change the motor. Use a 1/8” Allen wrench to loosen the two set
screws (item 4A). Remove the drive magnet assembly from the
motor shaft.
CAUTION CAUTION CAUTION CAUTION CAUTION::::: Keep the drive magnet and impeller assemblies away
from metal chips or particles.
EXAMINATION
1. Check the impeller drive bushing, thrust ring, ceramic thrust ring
and ceramic shaft for cracks, chips, scoring or excess wear. See
Figure 2. Replace as required.
2. Check for loose magnets on the drive magnet assembly or
rubbed areas on the impeller or barrier assemblies.
3. Check the o-ring for damage, cracking or swelling. Replace as
required.
4. If you did not remove the drive magnet assembly, check the set
screws for tightness before reassembly.
REASSEMBLY
1. Place the impeller assembly (item 2, 2A) over the ceramic shaft in
the barrier.
2. Install the o-ring (item 5) on the impeller housing (item 1).
Lubricate the o-ring with a compatible lubricant to facilitate o-
ring installation.
3. Place the impeller housing (item 1) onto the barrier (item 3)
being careful not to dislodge the o-ring.
4. Align the holes in the impeller housing and barrier and install the
8 mounting screws (item 6). Using a screwdriver, hand-tighten
screws being careful not to overtighten.
5. If the drive magnet (item 4) was removed, reinstall by sliding
drive magnet assembly onto the motor shaft until a distance of
1.69”+/- .015” is measured from the face of the motor to the top
of the drive magnet. See Figure 3. Align one set screw (item 4A)
with flat on motor shaft and tighten both set screws with 1/8”
Allen wrench to 70 in-lbs. (7.9 N-m).
6. Carefully slide the pump assembly over the drive magnet
assembly. Orient the discharge to either 12 or 3 o’clock
position. Align bolts from the motor with the holes in the barrier.
Install flat washer, lock washer and nuts. Securely tighten nuts.
7. Manually rotate pump assembly to ensure that the pump is not
binding or rubbing on the drive magnet assembly.
GENERAL NOTES GENERAL NOTES GENERAL NOTES GENERAL NOTES GENERAL NOTES
1. Do not allow the KC3, 4, or 5 to run dry.
2. Do not pump liquids containing metal fines.
3. Orient the discharge port to either 12 or 3 o’clock position.
4. The setting of the drive magnet dimension is critical. Failure to
properly set the proper dimension may result in decoupling or
damage to pump components.
5. Make sure the pump is filled with liquid before starting the
pump.
6. If magnets decouple, stop the pump immediately. The rare earth
magnets used in this pump are more resistant to demagnetiza-
tion than ceramic, but operating the pump with the magnets
decoupled will eventually weaken the magnets.
7. Plastic pumps will expand and contract with temperature so
periodically check and hand tighten the screws.
8. An information sticker is attached to the barrier section. The
first line is the model number, the second line is the serial
number. See Figure 4.
Figure 2
.280 max.
.293 min.- PVDF
.313 min. - PP
1.69” +/- .015” KC3, 4 and 5
Figure 3
Figure 4