W10498900 Dishwasher Middle Spray Arm Assembly

Key Features

• Precision Spray Pattern: Designed to rotate and deliver a high-pressure water stream upward into the upper rack and downward onto the lower rack for dual-action cleaning.
• Heat-Stabilized Construction: Manufactured from food-grade, high-durability plastic that resists warping and cracking during high-temperature wash and "Heated Dry" cycles.
• Integrated Hub Seal: Features a reinforced central mounting point to maintain a tight seal against the water supply manifold, preventing pressure loss.
• Low-Friction Bearings: Engineered to spin freely even with heavy dish loads, ensuring consistent water distribution across the entire dishwasher width.

Replaces / Cross-Reference Part Numbers

• W10498900
• AP6022331
• 2312929
• PS11755664
• WPW10498900
• EAP11755664

Compatibility & Fitment

This middle spray arm (also known as the upper spray arm) attaches to the bottom of the upper dishrack in many Whirlpool-built dishwashers. Key compatible models include:

• Whirlpool: WDT750SAHZ0, WDT720PADM2, WDTA50SAHZ0, WDT730PAHZ, WDT970SAHZ.
• Maytag: MDB4949SDH, MDB7949SDM, MDB8959SFZ.
• Amana: ADB1400PYW, ADB1400PYB, ADB1100AWB.
• KitchenAid: Fits various KDT and KDF series models utilizing the W10498900 assembly.

When to Replace

• Dirty Upper Rack Dishes: Cups and bowls in the middle/upper rack remain greasy or have food particles left on them after a cycle.
• Cracked Housing: The plastic seams of the arm have split, causing water to leak out of the sides rather than the jets, which prevents the arm from spinning.
• Clogged Nozzles: Calcium, lime, or food debris have permanently blocked the spray holes.
• Arm Not Spinning: The arm is physically stuck or the mounting hub is worn, causing it to wobble and hit the dishes.
• Falling Off: The screw or mounting bracket that holds the arm to the rack has failed or stripped.

Installation Tips

• Safety First: Ensure the dishwasher is off. Pull the upper rack out completely to gain clear access to the bottom of the rack.
• Removal: Most models use a center mounting screw (which may be plastic). Unthread the screw by hand or with a nut driver to release the old arm.
• Manifold Check: Inspect the water delivery tube (manifold) at the back of the rack for cracks or clogs before attaching the new arm.
• Orientation: Ensure the spray jets are facing the correct direction (usually the larger jets face upward toward the cups) before tightening the center screw.
• Test Spin: Spin the arm by hand after installation to ensure it does not strike any part of the rack or the water supply tube.