A pump has two major sections: the wet end which holds the water and the motor which dives the pump's impeller to move the water. Generally these two sections are either bolted together (like most Hayward pumps) or clamped together (like most Sta-Rite pumps). This guide shows you how to replace the impeller in a pump that is clamped together. For instructions on changing an impeller in a pump that is bolted together, see our guide on " How To Replace A Pool Pump Impelle r". Click here to view Sta-Rite Max-E-Pro impellers. (key 10)
Things You’ll Need
Step 1
INTRO TO HOW AN IMPELLER WORKS - For a quick introduction, this picture shows the operation of the impeller. Water enters the center of the impeller. As the impeller is spun by the motor, a series of blades, like a fan, pushes the water to the outside edges of the impeller where it exits through slots to be collected by the diffuser. For an expanded explanation of how a pump operates click How A Pool Pump Works.
Step 2
TURN POWER OFF - The first step in preparing to remove your pump's impeller is to turn off all power to the motor. For maximum safety turn off the power at the circuit breaker to the motor - usually located next to the timer box.
Step 3
RELIEVE PRESSURE - Next you will have to relieve the pressure that builds up in the pump during operation. To relieve pressure turn the relief valve on top of the filter counter clockwise. Water will spray out initially as you see the pressure on the pressure gauge go to 0 psi.
Step 4
UNSCREW CLAMP - Unscrew the knob on the pump clamp in a counter-clockwise direction to separate the ends of the clamp.
Click here to view the Sta-Rite Max-E-Pro clamp assembly. (key 9)
Step 5
REMOVE CLAMP - Slide the clamp off of the collars that join the pump sections together.
Step 6
SEPARATE SECTIONS - Rotate the motor section of the pump down and out of the pump wet end.
Step 7
NOTE POSITIONING - As you are taking the motor section out, note how it is positioned relative to the wet end. When you put these sections back together, the tab in the motor section will be inserted into the slot on the wet end.
Click here to view Sta-Rite Max E Pro parts.
Step 8
INSPECT DIFFUSER O-RING - Inspect the O-ring on the Diffuser to make sure it is tight and has no breaks of cracks. Replace is required.
Step 9
INSPECT CLAMP O-RING - Inspect the O-ring in the groove of the wet end. Replace if required.
Click here to view the Sta-Rite Max E Pro GOKIT.
Step 10
UNSCREW DIFFUSER - Remove the 5 screws that secure the Diffuser to the motor Seal Plate - turn counter-clockwise.
Click here to view Sta-Rite Max E Pro diffusers. (key 11)
Step 11
NOTE POSITIONING - As you are removing the Diffuser, note how it is positioned relative to the wet end. When you put the Diffuser back onto the Seal Plate, the slot on the Diffuser will engage with the tab on the Seal Plate.
Step 12
LIFT OFF DIFFUSER - With the screws removed, lift the Diffuser off of the top of the Seal Plate.
Step 13
UNSCREW ELECTRICAL COVER - Go to the back of the motor and remove the two screws that secure the Electrical Cover.
Click here to view Sta-Rite Max E Pro parts.
Step 14
REMOVE COVER - Remove the Electrical Cover to expose the electrical circuits of the motor.
Step 15
SECURE MOTOR SHAFT - Slip a flat open ended wrench under the wiring until it engages with the flatted sides of the motor shaft underneath the Governor.
Step 16
REMOVE IMPELLER SCREW - Go to the other end of the motor and remove the Impeller Screw. NOTE: THIS IS A LEFT HANDED THREADED SCREW. Turn it CLOCKWISE to loosen it. If you turn it counter-clockwise like most screws, you will break the screw.
Please click here to view the Sta-Rite Mx E Pro impeller screw. (key 10B)
Step 17
CHECK IMPELLER SCREW O-RING - Check the small O-ring at the base of the Impeller Screw. Replace if damaged.
Click here to view the Sta Rite Max E Pro impeller screw o ring.
Step 18
TWIST OFF IMPELLER - With the flat wrench in place to keep the motor shaft from rotating, unscrew the Impeller from the motor shaft by hand. Turn the Impeller counter-clockwise. If the Impeller is stuck on the shaft, use a strap wrench to free it. Do not use an adjustable wrench.
Click here to view Sta-Rite Max-E-Pro impellers. (key 10)
Step 19
VIEW SHAFT SEAL SECTIONS - This picture shows you the location of the two pieces of the shaft seal. One is on the Impeller Shaft and one is in the Seal Plate.
Click here to view the Sta-Rite Max E Pro shaft seals. (key 7)
Step 20
REMOVE SHAFT SEAL FROM IMPELLER - Twist the Impeller Shaft Seal half off the shaft of the Impeller. This should come off without much effort. Note that the spring end of the seal was placed next to the Impeller.
Step 21
UNBOLT SEAL PLATE - To get to the other half of the Shaft Seal, you will have to remove the Seal Plate from the Motor. Unbolt the four bolts that secure the Seal Plate to the Motor.
Click here to view the Sta-Rite Max E Pro seal plate.
Step 22
SEPARATE SEAL PLATE FROM MOTOR - With the bolts removed, lift the Motor off of the Seal Plate. Note the position of the Seal Plate to the Motor. The top of the Motor will line up with the flange part at the top of the Seal Plate.
Step 23
PUNCH OUT SEAL - With the other side of the Seal Plate open, you can now use a small screw driver to punch out the other half of the Shaft Seal. The Seal should come out easily.
Step 24
VIEW SHAFT SEAL SECTIONS - This is a picture of the two halves of the Seal once they are removed. When you put the new ones in, the white ceramic end of the one should make contact with the black ceramic end of the other.
Click here to view the Sta-Rite Max E Pro shaft seals. (key 7)
Step 25
SLIDE SHAFT SEAL ON IMPELLER - Twist the black ceramic Seal section onto the Impeller shaft. Make sure the spring end is towards the Impeller
Step 26
INSERT SHAFT SEAL INTO SEAL PLATE - Push the other half of the Seal into the Seal Plate. Make sure it is pushed all the way into the well. You might use the handle end of a screwdriver to help push it all the way in.
Step 27
WIPE SEAL SURFACES - Wipe the ceramic surfaces (black and white) with a clean cloth to remove any dirt or oil from your fingertips.
Click here to view the Sta-Rite Max E Pro shaft seals. (key 7)
Step 28
REATTACH SEAL PLATE - Bolt the motor back onto the Seal Plate. Remember to line up the top of the motor with the flange of the Seal Plate.
Step 29
TWIST ON IMPELLER - Twist the Impeller back onto the Motor Shaft with a clockwise motion.
Step 30
REPLACE ELECTRICAL COVER - Replace the Electrical Cover on the other end of the motor and secure it with the two screws.
Click here to view Sta-Rite Max E Pro parts.
Step 31
SCREW ON DIFFUSER - Secure the Diffuser onto the Seal Plate with the five screws. Line up the slots on the Diffuser with the black tab on the Seal Plate as shown.
Step 32
INSERT MOTOR INTO WET END - Place the motor onto the supporting bracket and push it into the Wet End. Make sure the tab on the Seal Plate lines up with the slot in the Wet End.
Click here to view the Sta-Rite Max E Pro wet end.
Step 33
SECURE CLAMP - Make sure the Wet End and Motor are pushed together. Then slide the Clamp over the joint between the two and secure it by tightening the Clamp Knob. Turn clockwise. To make sure the Clamp seats properly, tap around it occasionally with a rubber mallet as you are tightening the knob.
Click here to view the Sta-Rite Max-E-Pro clamp assembly. (key 9)
Step 34
REMOVE STRAINER COVER - Remove the strainer cover from the top of the pump by twisting it in a counter-clockwise direction.
Click here to view the Sta-Rite Max E Pro strainer cover.
Step 35
PRIME PUMP - Prime the pump with water from a garden hose. Note: the pump has been removed from its piping. Assume that the input and discharge ports have been reconnected to the system piping.
Step 36
REPLACE COVER - Check the Strainer Cover O-ring and replace it if necessary. Lubricate the O-ring and replace the strainer cover from the top of the pump by twisting it in a clockwise direction.
Click here to view the Sta-Rite Max E Pro GOKIT.
Click here to view Magic Lube O-ring Lubricant.
Step 37
TURN ON POWER - Reset circuit breakers and start pump.
Step 38
CLOSE RELIEF VALVE - Close the relief valve on top of the filter, after the air is purged and water starts to spray out of the valve.
Step 39
CHECK FOR LEAKS - Check for leaks around all the O-rings and gaskets you changed in this procedure to make sure the connections are tight enough.
Click here to view the Sta-Rite Max E Pro GOKIT.
Click here to view Magic Lube O-ring Lubricant.
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