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Customer Questions and Answers for Wash Arm Cap by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18043386
Manufacturer Part Number: WP99002654

This cap secures the dishwasher wash arm to its support, helping keep the arm properly positioned so water jets can spin and spray effectively for consistent cleaning performance.

  • Holds the wash arm in place on its hub/support
  • Can help address a loose, wobbly, or detached wash arm
  • Replacing a damaged or missing cap can restore stable arm rotation
What's included: One wash arm cap. Install notes:
  • Disconnect power and turn off water before service
  • Remove the lower rack for access; lift off the wash arm
  • Unscrew/press off the old cap; seat and secure the new cap
  • Ensure the wash arm spins freely by hand before reassembly

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Questions & Answers

For Whirlpool Wash Arm Cap (Part Number: OEM18043386)

Jack for Model Number MDBH965AWB

Lower wash arm hits heater clips and or manifold. A common problem and I have checked all the Q&A on this topic. Everything static looks perfect. You have never mentioned how much play there should be in the wash arm on the support shaft. Mine is a bit sloppy. After 10+ years it is possible that there is wear to the plastic part which fits over the steel shaft? There is just enough play for the arm to hit on occasion. Should I buy a new wash arm? Thanks.

1 Answer

Jack, Yes, you probably need a new wash arm WP6-917642 Also check that the wash arm cap has not disappeared. Check and make sure the discharge outlet W10296525 and screwsWP99002664 are not loose and the meatl shaft is not bent. There should only be 1/8 to 1/4 inch play in the lower spray arm. Thanks

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1 Answer

Hi. Remove the wash arm cap part # WP99002654 and observe the wash arm itself part # WP6-917642. If it is bent sloping down then it will engage the heater part # W10283681. Is the heater clipped into the brackets of the tub ? If it warped then you will need to replace it. Thank You.

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