How to Install a Waterway Pump Seal


Spa owners need to exercise the proper care and maintenance to save costly repairs. Faulty equipment sometimes happens despite all of your hard efforts. For instance, harsh chemicals may corrode the pump seal, which may cause water leakages. Likewise, a defunct motor can alter the pump seal's ability to contain water. Examining other internal components when replacing another might prevent future setbacks. Replacement component installation also requires experience to complete a competent and thorough job.

Things You'll Need

  • Waterway pump seal assembly
  • Socket, 1/4-inch
  • Phillips screwdriver
  • Flat-head screwdriver
  • Liquid detergent
  • Unsoiled, dry rag
  • O-ring grease
  • Switch off the power to the ground fault circuit interrupter (GFCI). Dislodge and remove the equipment access panel. Disconnect the motor controls by unplugging the cord.

    Shut the slice valves. Twist and slacken the two pump unions. Dislodge and remove

    the mounting bolts from the pump assembly in the equipment control box with a 1/4-inch socket.

  • Use a Phillips screwdriver to unscrew the pump's shroud. Dislodge and pull back the four locking bolts with a 1/4-inch socket, but do not fully remove them. Slacken and remove the eight mounting screws secured to the pump seal's front casing. Remove the front casing and place it off to the side.

  • Hold the impeller with one hand while using a flat-head screwdriver to grab the large socket until the shaft stops turning. Dislodge the impeller and secure it in a safe spot. Do not touch the socket.

  • Wiggle the impeller and remove the back plate attached to the pump shaft. Pry loose the impeller and back plate. Separate the old seal from the impeller housing with a flat-head screwdriver.

  • Apply a light coat of liquid detergent to the pump shaft and rubber seal. Slide the rubber seal down the shaft until flush with the shaft base.

  • Push the back plate spring out with a flat-head screwdriver. Clean the spring assembly housing of all grease, dirt and debris with an unsoiled, dry rag. Lubricate the spring assembly with a light coat of liquid detergent, then push it back into the housing. Do not touch the surface with your bare hands. Wipe the white ceramic disc with a unsoiled, dry rag to remove dirt, oil, grease and other debris.

  • Remove the o-ring and lubricate its housing with o-ring grease. Reinstall the o-ring after properly lubricating. Replace the old o-ring if it shows signs of wear.

  • Reinsert and torque the locking bolts and black plate. Do not over-tighten. Install the impeller by threading it on to the shaft until it starts spinning. Wedge the screwdriver into the shaft to stop it from spinning. Finger-tighten the impeller. Remount the front plate and shroud.

  • Reposition the Waterway pump. Twist open the check valves to refill the spa.

    Turn on the power through the GFCI.

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  • Photo Credit pool spa 1 image by Aaron Kohr from
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