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Pump Disassembly
S40HT Series
Pump Disassembly
Oil Fill
Plug
Housing
Capscrew
Insulating
Disk
Rotor/Stator
Assembly
Stator
Capscrew
Grn
Blk
Blk
Impeller and Seal Replacement,
Model S50HTPC1
Risk of electrical shock. Disconnect
electrical power before doing any service work on pump!
Refer to assembly drawing.
Disassembly
1. Unscrew hex-head cap screws, remove motor assembly
from volute and set it on its side in a clean area.
2. Remove oil plug. Turn pump upside down to drain oil.
3. Hold impeller; remove impeller nut and washer.
4. Unscrew impeller (turn counter-clockwise) for cleaning.
Risk of electric shock. Before touching
capacitor, discharge it by shorting the terminals
together with an amber handled screwdriver.
5. Loosen cord nut and gently pull cord assembly out from
motor cover. Disconnect wires from cord set (wires and
connector are color coded for reassembly).
6. Unfasten socket head screws holding motor cover to seal
plate and remove motor cover.
7. Remove rotating half of seal off of shaft.
8. Cradle motor assembly so that it stands vertically with
motor shaft extending out of the bottom.
9. 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 seat cavity.
Re-assembly
NOTICE: Make sure that seal faces are clean and
undamaged. Apply Permatex #2 or equivalent sparingly to
outside edge of seal body (with spring) Figure 2.
1. Press new seal body into cavity in seal plate (Figure 2).
Power Cord
O-Ring
Lower
Motor
Housing
Shaft Seal,
Stationary
Head Ass'y
Shaft Seal,
Rotating
Mating Ring
Impeller
Impeller side of seal plate
Volute
Permatex
here
410 0893
Permatex
here
2
Figure
2. Reinstall motor and shaft to seal plate using the four
through bolts removed in step 9 under "Disassembly".
NOTICE: Do not overtighten through bolts!
3. Slide new rotating half of seal onto shaft (Figure 3).
NOTICE: Do not nick or scratch the silicon carbide seal
face when passing it over shaft shoulder. Seal faces
must be clean and undamaged or seal may leak.
Slide ceramic
part onto
Press seal
shaft.
into cavity
Figure 3
4. Reassemble impeller, washer, and impeller nut.
5. Inspect O-Ring carefully; replace if damaged. If it is not
nicked or scratched, clean and reinstall.
NOTICE: It is good practice to replace O-Ring each time
pump is serviced.
6. Reinstall capacitor cover, feeding wire through connector
hole, then reconnect cord wires to connector. Reference
color code markings.
7. Fill motor with clean dielectric oil. To allow room for
expansion, oil level with cold motor should be about 1/4"
(6 mm) above top of motor assembly.
Motor Lead Connections (S50HTP1 only)
Connect to PW217-280 panel or duplex panel 27400A245.
Green
Green
Black
Capacitor
Red
White
Green
Black
Leads From
Stator
4
Impeller side of seal plate
Press seal
into cavity
Don't damage
rubber ring
on groove
White
Red
Black
White
Red
Black
Motor Leads
1308 1094
Slide ceramic
part onto
shaft.
Install washer,
then clip.
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