Finish Thompson MSKC series - Manual (Page 4)

4
For 71/B14 frame motors - install the motor adapter (item
11) onto the motor face. Slide the drive magnet (item 10) onto
the motor shaft so that the cone point setscrew (item 10B) is
aligned with the motor shaft keyway. install the drive magnet
so that it is recessed 1.016 mm (.040” +/- .005”) below the
surface of the motor adapter (see figure 2). Tighten both set-
screws with a 5/32” Allen wrench to 15.8 N-m (140 in-lbs.).
For 56C motor frame pumps:
Place the barrier (item 9) onto the motor adapter (item 11). Align
the bolt hole tabs and press the barrier into the motor adapter
until it snaps in place. Place the second stage impeller assembly
(items 2 & 8) into the barrier (note orientation of the recessed
square in top of impeller assembly). Proceed to step 2.
For 71 and 80 motor frame pumps:
1. if possible, set motor on fan cover with drive magnet assembly
facing up. Place the second stage impeller assembly (com-
prised of items 2 and 8) into the barrier (item 9). Grasping
the barrier at opposite bolt tabs, carefully lower the barrier
assembly into the motor adapter (item 11). Line up the tabs
of the barrier between the tabs on the motor adapter to avoid
pinching fingers. Once seated, rotate the barrier until the bolt
holes line up.
2. install the housing o-ring (item 4) on the barrier. Lubricate
the o-ring with a compatible lubricant to facilitate o-ring
installation.
3. install the second stage impeller housing (item 7) onto the
barrier being careful not to dislodge the o-ring. Align the bolt
hole tabs and gently press together (bolt clearance alignment
is critical).
4. install and lubricate the diffuser o-ring (item 6). install the
diffuser assembly (item 5) making sure to keep bolt clearance
alignment straight and making sure not to dislodge the o-ring.
5. if the first stage impeller drive shaft (item 3 ) was replaced,
reassemble it to the impeller assembly by matching the three
tabs on the end of the drive shaft with the three recessed slots
in the impeller assembly (item 2) and press together.
6. Looking through the hole in the center of the diffuser as-
sembly, note the orientation of the square recess in the top of
the impeller. insert the square end of the drive shaft through
the hole and into the square recessed hole in the top of the
impeller. Press gently but firmly to seat the drive shaft.
7. install and lubricate the housing o-ring. Coming straight
down, gently place the impeller housing (item 1) onto the
pump with the ceramic front spindle support sliding into the
bushing on top of the first stage impeller assembly (items 2
and 3). Orient the housing with the directional arrow on top,
the drain boss location on the bottom and with the mounting
holes aligned. install the six mounting bolts, washers, and
lock washers (items 12A, 12B, and 12C). Make sure the
housing o-ring is not dislodged or pinched. Hand tighten the
mounting bolts to pull the pump together using the pattern
shown in figure 3.
8. After the housing is tightened down, insert a screwdriver
into the suction and push down on the front of the first stage
impeller assembly (Note: Do not press on gray thrust ring)
to completely set the impeller drive shaft (item 3) into the
second stage impeller (item 8). Push firmly on the three
areas separated by the spindle support arms in the suction.
rotate the motor fan to verify nothing is rubbing.
9. 56C frame pumps. Carefully slide the pump assembly over
the drive magnet assembly. Orient the discharge port to either
the 12 or 9 o’clock position. Make sure the rabbet on the
motor is fully seated into the motor adapter (item 11). Align
the bolt holes in the motor adapter and the motor. install 4
bolts and washers (items 14A,14B,14C) and tighten securely.
OPTiONAL DrAiN iNSTALLATiON SeCTiON
1. remove the impeller housing from the pump assembly.
2. Clamp the impeller housing to a drill press table.
3. Using a 7/16” drill and the molded boss as a guide, drill
completely through the molded boss into the interior of the
impeller housing. De-burr the hole on the inside of the
impeller housing. See Figure 6.
Caution: Do not tap too deep or the impeller housing may
be damaged.
4. Using a 1/4” NPT tap, tap the hole in the molded boss to the
appropriate depth.
5. install drain plug or valve, being careful not to overtighten.
Figure 6
Drain fitting molded boss.
Use as a guide for drilling
and tapping 1/4” NPT.