Finish Thompson MSVKC Series User Manual

Page 4

7. Examine all of the o-rings for nicks or chemical attack and replace as

needed.

8. If the motor requires replacement, loosen the set screws and remove

the coupling half (part of item 29) from the motor shaft.

Caution: Improper orientation of the metric motor adapter can cause

premature coupling failure or cause the pump shaft to bottom out on

the motor shaft before

5. Install the coupling insert (center plastic part of item 29) onto the

coupling half on the motor. Now insert the pump shaft with coupling

half into the coupling insert until it is completely seated.

6. Locating the pump shaft through the bearing in the motor adapter

section (item 9) carefully slide the motor adapter (item 9) down the

shaft until it is fully seated on the (56C) motor rabbet or (63, 71, 80

frame) on the metric motor adapter. If a mounting plate (item 10) is

being used, gently slide it over the pump shaft and the motor adapter

section (item 9).

7. Rotate the mounting plate and the motor adapter to the desired

orientation (marked before disassembly), and align the holes through

the mounting plate, motor adapter and into the motor (metric motor

adapter if used). Secure the mounting plate and the adapter to the

motor (item 1)/metric adapter (item 2) using the correct hardware

(items 6, 7, & 8 for 56C or item 33 for metric).

8. Tap down gently with a rubber mallet on the top of the pump shaft

to ensure compete coupling engagement. Tighten both bearing set

screws onto the pump shaft using a 3/32” Allen wrench. Replace if

needed and lubricate the two motor adapter/ column extensions o-rings

(item 12) with a chemically compatible thread lubricant.

9. For 12” pumps, go to step 10. For 18” or longer pumps, slide the lock

ring (item 11) past the corresponding flats toward the motor. Make

sure to place the smaller inside diameter side of the lock ring toward

the motor. Use a chemically compatible thread lubricant to lubricate the

external plastic threads on the motor adapter (item 9) and the internal

11. Place the barrier/housing adapter on a clean surface with the white

ceramic post facing up. Place the impeller drive assembly (items 18

and 19) onto the ceramic post. Install and lubricate (with a chemically

compatitible lubricant) the housing o-ring (item 17).

12. Noting the reference marks made during disassembly on the impeller

housing and the barrier column assembly, align the bolt hole tabs and

snap the housing in place (bolt hole alignment is critical).

13. Install and lubricate the diffuser o-ring (item 21). Install the diffuser

assembly (item 22) being careful not to dislodge the o-ring and to keep

the bolt hole alignment straight.

14. If the impeller drive shaft (item 23) was replaced, reassemble it onto

the impeller assembly (item 19) by matching the three tabs on the end

of the drive shaft with the three recessed slots in the impeller assembly

and pressing together.

15. Looking through the hole in the center of the diffuser assembly, note

the orientatin of the square recess in the top of the first stage impeller

drive (item 18). Insert the square end of the drive shaft through the

hole in the diffuser and into the square recess in the impeller driive.

Press gently but firmly to seat the drive shaft.

16. Install and lubricate the housing o-ring (item 17) onto the diffuser (item

22). Lower the first stage impeller housing (item 24) straight down

onto the pump with the ceramic front spindle support sliding into the

bushing (item 18A) on top of the first stage impeller assembly. Orient

the housing with the direction arrow on top (same as discharge direc-

tion), the drain boss on the bottom, andwith the mounting holes aligned.

Install the mounting bolts and hardware (items 25A, B & C) making

sure not to dislodge the housing o-ring (item 17) or the diffuser o-ring

(item 21). Hand tighten the mounting bolts to pull the pump together

using the pattern shown in Figure 4.

plastic threads on the column extension (item 30). Gently slide the

column extension with bearing onto the pump shaft. Install if needed

and lubricatethe two column extension o-rings (item 12). Repeat step

9 for each column extension to be installed.

10. Thread the left hand threaded drive magnet assembly (item 14) onto

the pump shaft until it is 4” +/- 1/64” as measured from the top of

the drive magnet assembly as shown in Figure 3. A 9/16” wrench can

be used on the milled flats below the threads to hold the pump shaft

during this step. Apply a small amunt of Loctite Thread Locker 262

to the left-hand threaded 5/8-18 hex jam nut (item 15) and thread

onto the pump shaft. Tighten to 50 ft. lbs. Recheck the drive setting

dimension after the nut is tightened.

Figure 4

Figure 3

Reassembly

1. If the motor was replaced-

Slide the coupling half (half of #29) on to the motor shaft with the

splines facing away from the motor. On 56C motors, set coupling half

so that motor shaft is recessed 7/32”.

For 63 and 71 frame motors, set coupling half so that motor shaft is

recessed 7/16”, and on 80 frame motors set coupling half so that it

is flush with the motor shaft.

2. On 56C, 63, & 80 frame motors, align one set screw with flat or key slot

on motor shaft and tighten both set screws with a 1/8” Allen wrench

to 70 in.-lbs. (7.9 N-m). For 71 frame motors, align both set screws 90

degrees from motor flat or key slot and tighten as instructed above.

3. If the shaft was replaced, slide the second coupling half onto the pump

shaft (the end with the milled flat) with the splined side facing away

from the threaded end of the shaft. For 56C motor frames, set the

coupling with the pump shaft recessed 7/32”. For 63 and 71 motor

frames, set it with the pump shaft recessed 7/16”. For 80 frame, the

pump shaft should be recessed ¼”. When coupling half is set correctly,

align set screw with the flat on the pump shaft, and tighten both set

screws with 1/8”allen wrench to 70 in.-lbs. (7.9 N-m).

4. Place the motor gently on the fan cover for reassembly. For metric

frame pumps, install the metric motor adapter flange (item 2) onto

the motor with the correct hardware (items 3, 4, & 5). One side of

the adapter fits 63 & 80 frame motors (side B) and the other side fits

the 71 frame motors (side A). The letters A & B are molded onto the

adapter. For 71 frame motors the “A” must face the motor, and for

63 & 80 frame motors the “B” must face the motor. The metric motor

adapter must be oriented so that the adapter seats completely onto

the motor rabbet. Make sure your orientation marks are aligned (step

10 of disassembly instructions).

note: It is not recommended to reuse plastic screws. Always use

thread lubricant when installing plastic screws.