STA-RITE SP550120T Installation, Operation & Parts Manual page 4

NOTICE: Whenever the motor housing is being removed for
service, remove oil and replace it with new oil at reassembly.
Use only oil listed in parts list in this manual. When filling
with new oil, DO NOT overfill. Allow about 7/8" (22mm) air
space from top of boss in housing for expansion of oil when
the pump is operating.
Pump Disassembly
(The SP5 System with the SC550120T Pump only)
Impeller and Seal Replacement
A. Impeller removal (See the pump disassembly drawing):
1. Remove the oil fill plug and turn the pump upside
down to drain oil.
2. Remove the capscrews holding the upper motor
housing to the lower motor housing; lift off the upper
motor housing and remove the motor lead wires from
the connector to detach upper housing from assem-
bly. The lead wires are fitted with quick connect ter-
minals for this purpose.
3. Remove the capscrews holding the lower motor
housing to the volute; lift off the lower motor housing.
4. Hold the rotor shaft assembly and unscrew the
impeller by turning it counter-clockwise. Remove
impeller and clean it.
If no more service is needed, reverse instructions
above to reassemble the pump. Reattach the motor
lead wires as shown in Figure 2, fill with clean
dielectric oil (Part No. U197-8A), check the oil level
and replace fill plug. Oil should cover the motor wind-
ings.
Pump Disassembly
Oil Fill
Plug
Housing
Capscrew
Insulating
Disk
Rotor/Stator
Assembly
Stator
Capscrew
Grn
Blk
Blk
Power Cord
O-Ring
Lower
Motor
Housing
Shaft Seal,
Stationary
Head Ass'y
Shaft Seal,
Rotating
Mating Ring
Impeller
Volute
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B. Shaft seal replacement:
1. Follow the instructions to remove the impeller, above.
2. Remove the stator capscrews and the spacers (if
applicable). Lift off the stator.
3. Remove the seal's ceramic seat from the shaft and tap
the body of the seal out of the lower motor housing.
4. Clean the seal cavity thoroughly before installing the
new seal. NOTICE: Make sure that the seal faces
are clean; do not scratch or damage the new seal
face during seal replacement. Apply Permatex #2 or
an equivalent sparingly to the outside edge of seal
body before installing the seal in the lower motor
housing.
5. Press the new seal body into position in the lower
housing cavity.
6. Press the ceramic seat onto the motor shaft. The
impeller will pull it into position.
7. Reassemble the stator and tighten the stator cap-
screws.
Risk of electrical shock. Discharge
capacitor before handling it. Electrical shock can
burn or kill.
8. Reassemble the impeller and the pump (reverse
instructions 1 through 4 above).
9. Reattach the motor lead wires as shown in Figure 2.
Green Wire
(connected between
the two tallest
dividers)
View A-A
Figure 2
10. Fill with clean dielectric oil (Part No. U197-8A), check
the oil level and replace the oil fill plug.
The sump basin and cover, pump, and piping should be pro-
tected from freezing temperatures. If there is any danger of
freezing temperatures, the unit should be drained. Consult
your pump manual for instructions on how to drain the pump
to protect it from freezing.
4
Either Black Wire
Short Divider
Either Black Wire
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