Whirlpool Dishwasher Center Wash Arm Assembly W11814182, Replaces W11174340, W11545334, W11789943

W11814182 is the current genuine Whirlpool dishwasher centre wash-arm and manifold assembly. It replaces discontinued Whirlpool part numbers W11174340, W11545334, and W11789943 when fitment is confirmed by the appliance model number. The assembly mounts beneath the upper rack and rotates during the wash cycle — pressurized water travels through the manifold and spray openings to distribute wash water across dishes in the upper and centre areas of the dishwasher.

Is This the Right Part?

Confirm the complete model number before ordering. Similar-looking wash-arm assemblies may use different mounting clips, feed connections, or dimensions. Inspect the filter, sump, circulation pump, feed tube, and spray openings before replacing the manifold.

Common Symptoms

• Poor upper-rack cleaning — dishes coming out with food residue after a full cycle
• Uneven water coverage across the dish load
• Spray arm not rotating correctly during the wash cycle
• Water leaking at the manifold connection point
• Arm repeatedly detaching from the rack
• Weak wash action in part of the dishwasher

Check Before Replacing

• Clean the dishwasher filter and sump — a restricted filter reduces water flow and mimics manifold failure
• Inspect spray arm openings for mineral blockage — clear with a toothpick or fine wire before replacing the assembly
• Confirm the circulation pump is operating normally — a failed pump produces identical symptoms
• Check the upper-rack feed tube for cracks or disconnection — a damaged feed tube prevents water from reaching the centre arm

Part Details

Installation Notes

1. Disconnect electrical power and shut off the water supply before servicing.
2. Remove the lower dish rack and unscrew the lower spray arm to access the manifold assembly.
3. Photograph the mounting clip positions and feed connection before disassembly.
4. Compare the new assembly with the original before installation — confirm mounting clips and feed connection match.
5. Run a short cycle and inspect for leaks at all connection points before returning to normal use.

Skill level: Moderate — 20–35 minutes. Use a qualified technician when diagnosis or installation is outside your experience.

Verified Compatible Models

JDPSS246LM1, KDFE204KBL0, KDFE204KBS0, KDFE204KPS0, KDFE204KWH0, KDFM404KBS0, KDFM404KPS0, KDPM604KBS0, KDPM604KPS0, KDPM704KPS0, KDPM804KBS0, KDPM804KPS0, KDTE204KBL0, KDTE204KBS0, KDTE204KPS0, KDTE204KWH0, KDTM404KBS0, KDTM404KPS0, KDTM604KBS0, KDTM604KPS0, KDTM704KPS0, KDTM804KBS0, KDTM804KPS0, KDTM804KPS1, KDTM804KPS3, MDB4949SKB0, MDB4949SKB1, MDB4949SKW0, MDB4949SKZ0, MDB7959SKZ0, MDB8959SKB0, MDB8959SKK0, MDB8959SKW0, MDB8959SKZ0, MDB9959SKZ0, MDB9979SKZ0

Fitment reminder: Match the complete model number, including suffixes and revision digits, before ordering. Also fits select JennAir and affiliated-brand dishwashers — contact us to verify your model before ordering.