How to Install Dishwasher Spray Arm Assembly, Lower AGB32598301 in a LG Dishwasher

Quick answer: Roll the lower rack out. Lift the old arm off the hub in the centre of the tub floor, turning the locking collar if your model has one. Clean the hub and filter, set AGB32598301 on the hub with nozzles up, press or turn until it locks, then spin it by hand and run a rinse.

The lower spray arm assembly AGB32598301 is the rotating arm that sits on the tub floor of your LG dishwasher directly above the sump and filter. Pump pressure through its nozzles cleans everything in the lower rack and drives the arm around. When the nozzles clog with scale, the hub cracks or the arm warps, the lower rack comes out dirty while the top rack still looks fine. LG lists this assembly for models such as LDF7810BB01, LSDF995ST, LSD795ST4 and LDF6920WW. The assembly may include several pieces, so compare the parts diagram for your model.

Replacing the arm is an easy job that needs no tools. The only real difference between LG models is how the arm locks to the hub: some simply snap down, others use a collar that turns a quarter turn to release. This guide covers both, along with the cleaning and clearance checks that make sure the new arm actually spins once the door is closed.

See part details and every compatible model: AGB32598301

⚠️ Safety First
  • Wait until the tub is cool; a cycle that just finished leaves the floor and standing water hot.
  • Wear gloves when reaching into the sump, where broken glass often collects.
  • Never run the dishwasher with the arm removed; the pump will jet water straight up and may overflow the tub.
  • Keep loose pieces of the assembly away from children.

Tools and Parts You Need

  • Flashlight for a clear view of the hub and sump
  • Soft brush or old toothbrush to clean the hub and filter screen
  • Towel to soak up water in the sump
  • Work gloves to protect against the filter's sharp edges
  • White vinegar or dishwasher cleaner for scale around the hub

Step-by-Step Installation

  1. Empty the machine and open fully Take out dishes and the silverware basket. Open the door all the way so the lower rack can roll straight out on the door rails.
  2. Remove the lower rack Roll the rack out and set it on a towel. The lower spray arm is now visible in the centre of the tub floor, seated over the sump.
  3. Release the old arm If the arm has a locking collar at the hub, turn it a quarter turn in the direction of its arrow until it stops, then lift the arm off. If there is no collar, grip the arm near the hub and pull straight up with a slight rocking motion.
  4. Clean the hub and filter Brush scale and food off the hub the new arm will sit on. Twist out the cylindrical filter beside it, rinse the mesh under the tap and lock it back in place. A clogged filter starves the arm of pressure.
  5. Prepare the new assembly Check that any collar, cap or bearing included with AGB32598301 is fitted the way the parts diagram shows. Hold the arm against a light to confirm the nozzles are open.
  6. Seat and lock the new arm Lower the arm onto the hub with the nozzle openings facing up. Press straight down until it clicks, or turn the collar back a quarter turn until it locks. The arm should sit flat with no gap at the hub.
  7. Spin test Rotate the arm by hand through a full circle. It should turn freely with no scraping on the tub floor, the filter or the door lip.
  8. Refit the rack and run a rinse Roll the lower rack in and spin the arm again to confirm clearance. Close the door and run a short rinse cycle, then open it briefly to confirm the arm has moved.

Fit Checks Before You Call the Job Done

  • Arm sits flat on the hub with the click or collar lock felt
  • Arm turns a full circle by hand with the lower rack installed
  • Nozzle openings face up toward the lower rack
  • Filter is twisted back in and locked
  • After a rinse cycle the arm is in a different position than where you left it

Common Mistakes to Avoid

Forcing an arm that has a locking collar Pulling straight up on a collared hub can snap the collar or crack the sump. Look for an arrow or lock symbol on the hub and turn first.

Leaving the filter dirty A new arm will not spin properly if the filter is packed with debris. Cleaning it takes two minutes and is the most common fix for a lazy arm.

Not fitting all pieces of the assembly The assembly may ship with a cap or bearing. Leaving one out lets the arm wobble and leak pressure at the hub.

Skipping the clearance check with the rack in A bent rack wire or a tall pot can block the arm. Spin it with the rack loaded before you close the door.

Troubleshooting After Installation

Arm does not turn during the cycle Confirm the arm is locked onto the hub and the filter is clean. Clear each nozzle with a toothpick and run a cycle with dishwasher cleaner.

Loud clicking or knocking from the tub floor The arm is not fully locked. Remove it, clean the hub again and press or turn until the lock engages.

Lower rack dishes still come out dirty Check that tall items are not blocking the arm and that the nozzles face up. Load pans to the sides of the rack.

Water left in the sump after the cycle This points to the filter or drain rather than the arm. Clean the filter and check the sump for debris.

Care Tips After the Repair

  • Scrape plates before loading so the nozzles stay clear.
  • Rinse the filter every couple of weeks; the arm depends on it for pressure.
  • In hard-water areas run a descaling cycle monthly.
  • Load the lower rack with tall items to the sides so the arm has a clear path.

Compatible Models (Sample)

This part is listed for 52 LG models in our fitment data. Always confirm your exact model number on the appliance's rating plate.

Repair Difficulty and Time

Difficulty: Easy. Typical time: 10 to 20 minutes.

Frequently Asked Questions

Which LG dishwashers use spray arm assembly AGB32598301?

It is listed for models including LDF7810BB01, LSDF995ST, LSD795ST4, LDF6920WW, LSDF795ST and LDF7932BB. Check the model label on the door edge and confirm on the parts diagram before ordering.

What is included in the assembly?

The assembly may include multiple parts such as the arm and its hub hardware. The parts diagram for your model lists exactly what ships in the box.

Do I need any tools?

No. The arm releases and locks by hand. A brush for the hub and filter is the only extra worth having.

How do I know the old arm needs replacing rather than cleaning?

A cracked hub, a split arm or an arm that does not spin freely by hand even when clean needs replacing. If it is only clogged, clearing the nozzles is enough.

Final Checklist

  • Tub cool and dishwasher empty
  • Lower rack removed
  • Old arm unlocked and lifted off the hub
  • Hub and filter cleaned and filter locked back in
  • AGB32598301 seated with nozzles up and locked
  • Arm spins freely with the rack in place
  • Rinse cycle run and arm movement confirmed

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