Whirlpool Dishwasher Spray Arm Water Supply Tube Replacement Guide

The spray arm water supply tube (part #WPW10340745) is important in Whirlpool, KitchenAid, and Maytag dishwashers. If the upper rack dishes aren’t being cleaned effectively, a damaged or clogged tube may be the culprit.

This tube delivers water to the middle and upper spray arms and secures the upper spray arm in place. Over time, wear, cracks, or debris buildup can reduce water flow, leading to poor cleaning results.

How the Spray Arm Water Supply Tube Works

The spray arm water supply tube is a curved plastic component located at the back of the dishwasher’s interior.

• Top Section: Connects to the water inlet at the bottom of the upper spray arm.
• Middle Section: Directs water to the rotating middle spray arm.
• Bottom Section: Secures in a bracket near the floor, just under the lower spray arm.

When the supply tube becomes obstructed or cracked, water flow is limited. As a result, the dishes in the upper rack may remain dirty, leaving food particles, spots, or residue on glassware, utensils, and plates. Replacing this part restores proper water flow and cleaning performance.

Tools and Supplies Needed

This repair is quick and requires minimal tools. Make sure you have the following:

• Flat Blade Screwdriver
• Replacement Spray Arm Water Supply Tube (part #WPW10340745) – Use your dishwasher’s model number to find the correct part on AppliancePartsPros.com or a similar supplier.
• Towels – To catch any residual water drips.

How to Replace a Dishwasher Spray Arm Supply Tube

Remove the Top and Bottom Dish Racks

1. Pull the top dish rack out completely to extend the rollers without applying pressure on the sides.
2. Locate the gray plastic stoppers at the top of the upper rack rails and note their position and orientation.
3. Insert a flathead screwdriver into the square notch on each stopper. Gently pry upwards and pull the stoppers out. Set them aside.
4. Slide the top rack off the tracks and place it on a towel, keeping the rollers off the floor.
5. Repeat the process for the bottom rack. Pull it out slowly while keeping the wheels aligned on the tracks.

Detach the Lower Wash Arm and Filter Screen

1. Grasp the lower spray arm and turn the large plastic retaining nut 1/4 turn counterclockwise. Lift the spray arm straight up to detach it.
2. Locate the cylindrical fine filter assembly on the dishwasher floor near the spray arm. Note the orientation of the handle.
3. Insert a flathead screwdriver into the notches on the filter cover and gently pop it off. Set the cover aside.

Remove the Old Spray Arm Supply Tube

1. Locate the top end of the supply tube near the dishwasher ceiling, which connects to two locking tabs in slots.
2. Use the flathead screwdriver to pry the tabs while sliding the tube leftwards to disconnect the top end.
3. Move to the middle of the tube where it is secured by a central bracket. Pry the tube loose from the bracket using the screwdriver.
4. Tilt the tube downward and release the lower brackets by applying gentle pressure sideways with the screwdriver.
5. Remove the old tube completely and set it aside.

Transfer the Mounting Bracket to the New Tube

1. Find the rectangular white mounting bracket positioned midway along the curvature of the old supply tube.
2. Slide the bracket off the old tube.
3. Align the bracket on the new spray arm supply tube and press it into place.

Install the New Spray Arm Supply Tube

1. Position the new tube correctly to match the original orientation, with the brackets and notches aligned properly.
2. Slide the bottom end clips into the slots on the tub’s base and apply pressure until they snap into place.
3. Pivot the tube upward and align the middle bracket with the central metal support. Press firmly until it clicks into position.
4. Tilt the top end of the tube into place, aligning the locking tabs with the slots. Press until the tabs snap securely.
5. Check all connection points to confirm the tube is fully installed.

Reinstall the Filter Screen and Lower Wash Arm

1. Place the fine filter assembly back over the outlet port on the dishwasher floor, matching its original orientation.
2. Press around the rim to relatch all clips securely.
3. Reattach the lower spray arm by positioning it correctly and turning the retaining nut clockwise 1/4 turn until it is tight.

Replace the Dish Racks

1. Slide the bottom dish rack back onto the tracks, keeping the wheels aligned properly.
2. Slide the top dish rack back into the upper rails, carefully aligning the rollers.
3. Reinsert the gray plastic stoppers into the upper rack rails, pressing them until all four locking tabs snap into place.

Restore Power and Water to the Dishwasher

1. Reconnect the dishwasher to the electrical outlet or turn the breaker switch back on.
2. Turn the water supply valve counterclockwise to restore water flow.
3. Run an empty test cycle to check for leaks and confirm water sprays properly from the wash arms.
4. Load dishes back onto the racks and run a regular wash cycle to monitor cleaning performance.

Wrapping it all up, replacing your Whirlpool dishwasher’s spray arm water supply tube is a game-changer you didn’t see coming! Imagine turning those stubborn, leftover food bits and cloudy glassware into spotless, gleaming dishes with just a simple swap. It’s surprising how such a small part can make such a huge difference in your kitchen routine.