Pump Disassembly; Pump Reassembly/Seal Replacement; Restart Instructions - Pentair sta-rite 5PXF Installation And User Manual

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Pump Disassembly

1. All moving parts are located in the rear subassembly of this pump.
2. To remove and repair the motor subassembly perform the following procedures:
a. Turn off the pump circuit breaker at the main panel.
b. Drain the pump by removing the drain plugs.
c. Using an open end wrench, remove the six (6) nuts that secure the main pump body (strainer pot/volute) to the rear
subassembly.
d. GENTLY pull the two pump halves apart, removing the rear subassembly.
e. Remove the three hexagonal head screws holding the diffuser in position.
f. Using a 3/4 inch socket wrench, hold the impeller securely in place and remove the impeller lock screw.
NOTE: The screw is a left-handed thread and loosens in a clockwise direction.
g. Remove the motor fan cover using a screwdriver.
h. Using an adjustable wrench to hold the motor shaft, twist the impeller counter-clockwise to remove it from the shaft.
Be sure not to scratch or mark the polished shaft seal faces; seal will leak if faces are damaged.
i. Remove the four (4) nuts from the seal plate to the motor using a 9/16 inch wrench.
j. Place the seal plate face down on a flat surface and press out the ceramic part of the mechanical seal.
k. Clean the seal plate, seal housing, and the motor shaft.

Pump Reassembly/Seal Replacement

1. Install the SPRING END onto the impeller shaft. Be
sure BLACK/CARBON face is facing outward.
2. Remount the seal plate to the motor using the four
(4) lock washers and four (4) nuts.
3. With the white ceramic face facing outward, press
the seal into the seal plate with your thumbs and wipe
off the ceramic with a clean cloth.
4. Hand tighten impeller onto the motor shaft.
5. Screw in the impeller reverse lock screw (counter-
clockwise to tighten).
6. Install the fan cover on the back of the motor.
7. Remount the diffuser onto the seal plate. Make sure
the plastic pins and holding screw inserts are aligned
(see "TOP" indicator).
8. Assemble the motor subassembly to the housing.
DO NOT tighten the nuts and washers until all four (4)
motor bolts are in place. Using a torque wrench, install
and tighten the four nuts to a torque value of 11,2 nm
(maximum). CAUTION! DO NOT overtighten the nuts.
9. Fill the pump with water.
10. Reinstall the pump lid and locking ring; see SECTION 3, Maintenance.
11. Reprime the system.
The Shaft Seal
1. The Shaft Seal consists primarily of two parts, a rotating member and a ceramic seal.
2. The pump requires little or no service other than reasonable care, however, a Shaft Seal may occasionally become
damaged and must be replaced.
The polished and lapped faces of the seal could be damaged if not handled with care. In mild climate area, when
temporary freezing conditions may occur, run your filtering equipment all night to prevent freezing.

Restart Instructions

If the pump is installed below the water level of the pool, close return and suction lines prior to opening hair and lint pot
on pump. Make sure to reopen valves prior to operating.
DO NOT run the pump dry. If the pump is run dry, the mechanical seal will be damaged and
the pump will start leaking. If this occurs, the damaged seal must be replaced. ALWAYS
maintain proper water level in your pool (half way up skimmer opening). If the water level
falls below the skimmer opening, the pump will draw air through the skimmer, losing the
prime and causing the pump to run dry, resulting in a damaged seal.
NOTE
Continued operation in this manner could cause a loss of pressure,
resulting in damage to the pump case, impeller and seal.