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The lower spray arm is responsible for circulating water to dishes in the lower rack. A clogged or cracked arm causes insufficient water pressure, leaving food residue on dishes after the wash cycle.
If the center hub snap-fit is worn or the blue locking cap is melted or broken, the arm will repeatedly pop off the post during operation, disrupting water flow and causing noise.
A spray arm that is cracked, warped, or improperly seated can wobble and strike the dish rack or tub walls during rotation, producing a loud knocking or rattling sound.
Overloaded dishwashers or items blocking the arm's rotation path can cause physical damage or warping. A damaged arm cannot spin freely or distribute water evenly and must be replaced.
💡 Pro Tip: Is Your Lower Spray Arm the Problem?
Your part is likely the culprit if you notice any of the following:
⚠️ Dishes in the lower rack come out with food residue or grease still attached
⚠️ The spray arm is visibly cracked, chipped, warped, or has melted plastic (especially around the blue center cap)
⚠️ The spray arm keeps popping off its hub or won't stay snapped in place during the wash cycle
⚠️ Unusual rattling or knocking noise from the lower rack area during washing
🔍 Quick Diagnosis: Pull out the lower rack and spin the arm by hand — it should rotate freely with no wobble or drag. Hold it up to the light and check each jet hole; if any are blocked by debris or scale, try soaking in white vinegar first. If the arm is cracked, warped, or the hub no longer snaps securely, replacement is the right call.
📦 What's in the Box
✅ 1× Lower Spray Arm Assembly (part 5304507158, ABS, snap-fit hub, multi-directional jets)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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