How To Replace a Motor on a Sta-Rite Max-E-Pro Pool Pump


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This guide provides a step by step procedure for replacing a motor on a Sta-Rite Max-E-Pro Pool Pump. Although it features a Max-E-Pro pump, similar steps can be applied to most pool pumps.


Step by Step


Step 1

Here's a list of common tools you will need to replace your motor: screwdrivers (Phillip head and flat), 9/16" socket wrench, 7/16" open end wrench, channel wrench or strap wrench, silicon gasket lubrication (do not use petroleum jelly), clean soft cloth, "GO KIT" - pool pump seal replacements

Step 2

TURN OFF POWER - Before you start, make sure that the power to the pump is turned OFF. For maximum safety turn off the power at the circuit breaker to the motor.

Step 3

SEPARATE MOTOR FROM PUMP - The pump we'll need to be separated in half at the seal plate and housing. Loosen the knob that secures the clamp. Remove the clamp from the Max-E-Pro pump.

Step 4

ROTATE MOTOR ASSEMBLY - If you are tight on space behind the motor, now is when you can turn to gain easier access to the back.

Step 5

DISCONNECT BONDING WIRE - Unfasten the heavy copper bonding wire from the bonding lug on the pool pump motor. We used a 1/4" socket to loosen the lug.

Step 6

REMOVE COVER - Loosen the screw on the back of the cover and remove the cover.

Step 7

DISCONNECT POWER WIRES - Disconnect the three wires coming into the motor through the conduit. 

There will be 4 wires if you are replacing a 2-speed motor.

Step 8

UNSCREW CONDUIT ADAPTER - Unthread the conduit adapter and remove that as well as the wires from the old motor.

Step 9

MOVE MOTOR - The motor is now completely disconnected and can be lifted out to be worked on in a more convenient area.

Step 10

REMOVE DIFFUSER - Remove the 5 diffuser screws and pull the diffuser away from the motor assembly.

Step 11

PREPARE TO REMOVE IMPELLER - To remove the impeller you will twist the impeller off in a counter-clockwise motion. The impeller cannot be freed from the motor shaft without first securing the motor shaft. Move to the back electrical end of the motor.

Step 12

SECURE MOTOR SHAFT - To secure the shaft from rotating, slide a 7/16" wrench until it engages with the flat end of the motor shaft.

Step 13

REMOVE IMPELLER - At the impeller end, twist off the impeller in a counter-clockwise motion. You may have to use a strap wrench to free up the impeller.

Step 14

REMOVE MOTOR PLATE BOLTS - Using a 9/16" socket wrench, remove the four bolts that hold the seal plate to the motor.

Step 15

REMOVE SEAL PLATE - Lift off the seal plate.

Step 16

REMOVE SPRING SEAL FROM IMPELLER - Pull off the spring portion of the shaft seal from the pump impeller.

Step 17

REMOVE CERAMIC SEAL FROM SEAL PLATE - The ceramic seal can be removed by pressing on the seal from the backside of the motor. It should pop right out.

Step 18

PLACE WHITE HALF OF SHAFT SEAL - Set the new seal on the shaft inside the seal plate - white side up. Be very careful NOT TO TOUCH the white ceramic side of the seal with your hands. Use a clean cloth to push the seal into the seal plate.

Step 19

PUT NEW HALF OF SHAFT SEAL ON IMPELLER - Push the other half of the new seal onto the pool pump impeller. Place the new seal with the black SHINY side facing out.  Again, DO NOT touch the shiny surface of the seal that will make contact with the white surface of the seal in the seal plate.

Step 20

PUT SEAL PLATE ON MOTOR - Place the motor seal plate onto the motor shaft and slide it back against the face of the motor.

Step 21

SECURE MOTOR TO PLATE WITH BOLTS - Tighten the 4 bolts from Step 14 using a 9/16" socket wrench.

Step 22

REMOVE MOTOR COVER - Loosen the screw(s) at the back of the motor and remove the cap.

Step 23

SECURE MOTOR SHAFT - To secure the shaft from rotating, slide a 7/16" wrench behind the thermal protector until it engages with the flat end of the motor shaft.

Step 24

TWIST IMPELLER ONTO MOTOR SHAFT - Place the impeller onto the motor shaft and spin it on with a clockwise motion. Do not overtighten. Just firm it up.

Step 25

SLIDE DIFFUSER O-RING ONTO DIFFUSER - Lubricate the diffuser o-ring using a Teflon or silicone lubricant. Slip the diffuser o-ring onto the front of the diffuser and into the groove.

Step 26

PLACE DIFFUSER ONTO SEAL PLATE - Place the diffuser onto the seal plate and tighten the 5 screws from Step 10.

Step 27

THREAD IN CONDUIT ADAPTER - Thread in conduit adapter in the hole next to the wiring terminal.

Step 28

CONNECT POWER WIRES TO TERMINAL - Insert the three power wires through the electrical conduit. Connect the three power wires to the motor terminal. Black wire (hot) to terminal L1; Red wire (hot) to terminal L2; and green ground wire to the ground screw.

Note: We wired this motor for 230V. There is a wiring diagram for 115V on the motor label.

Step 29

REINSTALL MOTOR COVER - Slide the cover back onto the motor and tighten the 2 screws.

Step 30

ATTACH BONDING WIRE - Attach the bonding wire onto the motor's bonding lug.

Step 31

INSTALL HOUSING O-RING - Lubricate the housing o-ring and install it into the grove on the volute.

Step 32

REINSTALL CLAMP - Push the motor assembly up against the pump housing. Wrap the clamp around the two halves and tighten the knob.

Step 33

INSTALLATION COMPLETE - At this point, the pump can be primed and the power can be turned back on.


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 Posted: 1/9/2021 

Seal plate to the motor didn’t notice a gasket was used? I believe it is on the Go kit54 has one...

InyoPools Product Specialist  Posted: 1/12/2021 

Replacing the seal plate o-ring is not required when installing the motor; only the shaft seal is vital to the installation.