How to replace a Bosch dishwasher spray arm

Step-by-step

1. 1

   Turn off the dishwasher

   Switch off the power at the wall socket. Allow 10 minutes for any residual water to drain from the system.

   💡 Leave the door open to speed up cooling.

2. 2

   Remove the lower basket

   Pull out the lower basket fully and set it aside on a clean surface. This gives you access to the lower spray arm.

   💡 Check for food debris blocking the basket rails.

3. 3

   Locate the spray arm collar

   Find the plastic collar at the base of the lower spray arm in the centre of the tub. It rotates anticlockwise to release.

   💡 Use a torch to see the collar clearly if your dishwasher interior is dark.

4. 4

   Unscrew the collar anticlockwise

   Grip the collar firmly and turn it anticlockwise by hand until it comes free. The spray arm will lift out once the collar is removed.

   💡 If stuck, wrap a cloth around the collar for better grip.

5. 5

   Lift out the old spray arm

   Pull the spray arm straight up and out of the tub. Check the connector hole for debris and clean if necessary.

6. 6

   Insert the new spray arm

   Align the new spray arm post with the centre hole and push down firmly until seated. You should hear or feel a slight click.

   💡 Ensure the arm sits flat and level in the tub.

7. 7

   Reattach the collar clockwise

   Thread the collar back onto the post and turn clockwise by hand until tight. Do not overtighten or the plastic may crack.

   💡 Stop when you feel resistance—hand-tight is sufficient.

8. 8

   Replace the lower basket

   Slide the basket back in, ensuring it sits evenly on both rails. Check that the spray arm rotates freely without obstruction.

9. 9

   Test the dishwasher

   Close the door, turn on the power, and run a short cycle to confirm the spray arm spins correctly and water jets out.

   💡 Stop the cycle after 2 minutes if you spot leaks.

Parts you may need

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