Hayward SPX4000MR Motor Lock Ring - For NorthStar

What This Part Is Used For
The Hayward SPX4000MR is a motor lock ring specified for Hayward NorthStar pumps. It secures the motor to the pump wet end so the seal plate and housing stay properly clamped together. This ring is located at the motor to wet end connection on the pump.

Why This Part Matters
If the lock ring is cracked, loose, or missing, the pump can leak at the seal area or pull air because the wet end is not held tight. A poor clamp at the motor connection can also cause vibration and repeat seal failures after a rebuild. Replacing the correct lock ring restores proper clamping force and alignment. This is commonly needed after a pump has been opened for a shaft seal or impeller service.

Key Features and Specifications

• Manufacturer part number: SPX4000MR
• Motor lock ring specified for Hayward NorthStar pumps
• Secures motor to the pump wet end connection
• Helps maintain alignment and sealing at the motor to wet end interface
• Service replacement for damaged or missing clamp ring hardware

Installation and Fitment Guidance
Disconnect power at the breaker and relieve pressure before disassembling the pump. Make sure the ring seats evenly and clamps the assembly uniformly so the seal surfaces stay square. Confirm by manufacturer part number before ordering.

About the Hayward Brand
Hayward manufactures a full residential pool equipment ecosystem including pumps, filters, heaters, automation controls, cleaners, chlorination systems, and service parts. Their pumps integrate with Hayward filtration and heating equipment across many residential equipment pads. Service hardware like lock rings supports long term maintenance by keeping wet end rebuilds reliable. Hayward replacement parts are widely supported across the pool industry.

Common Service Context
Techs typically replace lock rings when a NorthStar pump has been rebuilt and the clamp hardware is found cracked, stripped, or not holding tight. It is often identified when a pump leaks at the seal area even after replacing internal seals.