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Impeller, Seal, and Capacitor Replacement
– MWS9 Series
Risk of electrical shock. Disconnect electri-
cal power before doing any service work on pump!
Refer to assembly drawing, Page 9.
Disassembly
1. Remove hex head bolts holding motor housing to volute.
Remove motor housing; set it on its side in a clean area.
2. Hold impeller; remove impeller capscrew and washer or
jam nut.
3. Slide impeller off of shaft for cleaning. If necessary, tap
impeller to loosen it.
4. Cradle motor assembly so that it stands vertically with
motor shaft extending out of the bottom.
Risk of electric shock. Before touching
capacitor, discharge it by shorting the terminals
together with an amber handled screwdriver.
5. Unfasten hex head screws holding capacitor cover and
remove cover. Disconnect wires from power cord set
(wires and connector are color coded for reassembly).
Turn pump upside down to drain oil.
6. If replacing capacitor (single phase only), remove wires
from capacitor. Remove capacitor.
7. Slide a small screwdriver down beside the shaft and pry
lip seal out. Discard lip seal after removal. Be careful not
to scratch shaft.
8. Remove retaining ring and washer from motor shaft and
slide rotating half of seal off of shaft.
9. Remove motor cover from seal plate. Remove through
bolts from motor assembly. Remove motor and shaft
from seal plate.
10. Working from back of seal plate, tap primary seal head
out of seal plate; thoroughly clean seal cavity.
Capacitor Connections (Single Phase Only)
Green
Black
Capacitor
Red
Black
Leads From
Stator
Green
Red
White
Green
Red
Motor Leads
HT7 only
3 Phase Wiring Connection Diagrams
Stator Leads: 9 Wire
208-230V
460V
L1
L2
L3
L1
L2
Red
Black
White
Red
Black
1
2
3
1
2
4
6
5
4
5
8
7
7
8
9
3828 1100
Re-assembly
NOTICE: Make sure that seal faces are clean and undam-
aged.
1. Apply Permatex #2 sparingly to outside of the primary
seal head. Press new primary seal head into cavity in
seal plate. See Figure 3.
2. Set seal plate on cradle and reinstall motor.
NOTICE: Do not overtighten through bolts!
3. Inspect seal plate O-Ring carefully; replace if damaged.
Place O-Ring in groove on seal plate, mount motor on
seal plate with socket head screws.
NOTICE: It is good practice to replace O-Ring each time
pump is serviced.
4. Turn assembly upside down and slide new rotating mem-
ber of seal onto shaft. Apply soap to rubber ring to aid in
sliding seal on shaft.
NOTICE: De-burr snap ring groove before installing seal.
Do not damage ceramic face or rubber ring when pass-
ing seal over shaft shoulder and snap ring groove shoul-
der. Seal faces and ring must be clean and undamaged
or seal may leak. See Figure 4.
5. Reinstall washer and snap ring on shaft. See Figure 5.
6. Install new lip seal (Figure 6). Lubricate lip seal with a
small amount of Aqualube or a lithium-based grease.
7. Reassemble impeller, impeller capscrew or jam nut and
washer.
8. Reinstall capacitor (single phase only). See below, for
electrical connections to capacitor.
9. Fill motor with clean dielectric oil (Part No. U197-8A). To
allow room for expansion, oil level with cold motor should
be about 1/4'' (6-7mm) above top of motor assembly.
10. Inspect capacitor cover O-Ring; replace if damaged. If it
is not nicked or scratch, clean and reinstall.
NOTICE: It is good practice to replace O-Ring each time
pump is serviced.
11. Reconnect motor lead wires to connector. Reference
color code markings and Wiring Connection diagrams,
below. Reinstall capacitor cover.
Impeller side of seal plate.
Permatex
here.
into cavity.
3
Figure
White
Install washer,
Black
then clip.
White
Black
Figure 5
1308 1094
Stator Leads: 12 Wire
208-230V
L3
L1
L2
L3
White
Red
Black
White
3
1
2
3
6
4
5
6
8
7
9
9
10
11
12
7
Slide ceramic
Press seal
part onto shaft.
4
Figure
Slide seal
onto shaft.
Figure 6
460V
L1
L2
L3
Red
Black
White
1
2
3
10
11
12
4
5
6
8
9
7
3827 1100
Don't damage
rubber ring
on groove.
2799 0497
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