How to Replace AHA75673404 Drain Pump Assembly on LG Washers — Step-by-Step

You run a load, the washer stops mid-cycle, and there's standing water at the bottom of the tub. You hear the motor hum, but nothing happens. That's your drain pump giving up — a common failure on LG top-loaders like the WT7300CW and WT7400CW series. The AHA75673404 drain pump assembly (which replaces AP6978814 and PS12748410) is the component that evacuates water during the drain and spin cycles. When it fails, your washer won't drain.

What You Need Before Starting

• 1/4-inch nut driver or socket wrench
• Flat-head screwdriver
• Needle-nose pliers
• Towels (for spilled water)
• Bucket or shallow pan

Repair Time: 30-45 minutes

Difficulty: Moderate

Safety First

Unplug the washer completely before starting. Pull it away from the wall so you can access the back panel. If there's standing water in the tub, bail out as much as you can with a cup — you'll still get some spillage when you disconnect the pump, so have towels ready. Never work on a plugged-in appliance, especially when dealing with water and electrical connections.

Step 1: Remove the Back Access Panel

The drain pump on LG top-loaders sits at the bottom rear of the cabinet. Use your 1/4-inch nut driver to remove the screws securing the back panel — there are usually six to eight screws around the perimeter. Lift the panel off and set it aside. You'll see the pump at the bottom left, connected to the tub outlet hose and the drain hose.

Step 2: Disconnect the Hoses and Wiring

Place your bucket under the pump. Squeeze the spring clamp on the inlet hose (coming from the tub) with pliers and slide it back, then pull the hose off — water will spill. Do the same for the outlet drain hose. Now disconnect the wire harness from the pump by pressing the tab and pulling it straight off. Keep track of which hose goes where, though the inlet is always larger.

Step 3: Remove the Old Pump Assembly

The pump mounts to a bracket with two or three screws. Remove these screws with your nut driver and pull the entire pump assembly free. Check the impeller housing for debris — sometimes a sock or small item jams the pump and causes the "will not drain" symptom even if the motor still hums.

Step 4: Install the New AHA75673404 Pump

Position the new pump in the mounting bracket and secure it with the screws you removed earlier. Reconnect the wire harness until it clicks. Push the inlet hose onto the pump inlet and slide the spring clamp back into position — pull on the hose to make sure it's seated. Attach the drain hose the same way. Double-check both clamps are tight.

Step 5: Reassemble and Test

Replace the back panel and secure all screws. Plug the washer back in, push it back into place, and run a drain/spin cycle without clothes. Listen for the pump to engage — you should hear a steady hum and see water flowing out the drain hose within 10 seconds. If it drains completely and the error code clears, you're done.

Testing After Installation

Run a small test load and watch the drain cycle closely. The washer should drain within two to three minutes. Check under the machine for leaks around the hose connections during the first few cycles. If you see drips, tighten the spring clamps. The pump should run quietly — grinding or loud rattling means something's still wrong or the impeller is hitting debris.

Frequently Asked Questions

Will this pump fit my Kenmore washer with an LG model number?

Yes. Many Kenmore washers in the 31xxx series are rebranded LG machines. If your model number starts with 31452 or similar, and the old pump looks identical to the AHA75673404, it'll work. Cross-reference your model number with the compatible list — models like WT7060CW, WT7800CW, and WT7900HBA all use this same pump assembly.

My washer hums but won't drain — is it definitely the pump?

Usually, yes. That humming sound is the motor trying to run while the impeller is jammed or the pump has seized. Pull the pump and spin the impeller by hand — if it doesn't turn freely, the pump's toast. Sometimes a clogged hose causes the same symptom, so check the drain hose for kinks or blockages before replacing the pump.

Do I need to replace the whole assembly or just the motor?

Replace the whole assembly. LG sells the AHA75673404 as a complete unit — pump housing, motor, impeller, and mounting bracket. Trying to swap just the motor isn't practical and you won't save money since aftermarket motors alone cost nearly as much as the full assembly. Plus, you get fresh hose fittings and no risk of leaks from reusing old parts.