Kenmore Dishwasher Drain Pump 66577989K703 – What Part Fixes Drain & Loud Pump Problems?
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Understanding the Problem
Brief explanation: The Kenmore genuine drain pump 66577989K703 is the motor-driven component that forces wastewater out of the dishwasher and into the household drain. When it fails the machine may not drain, will make grinding or humming noises, leak at the pump seal, or display drain-related error codes. Step-by-step diagnostic and repair instructions: 1) Safety first: unplug the dishwasher or switch OFF the circuit breaker and close the hot water supply if you’ll disconnect hoses. Confirm power is off with a non-contact voltage tester. 2) Confirm the symptom: run a short drain cycle (or run a rinse and watch). Note noises (humming, grinding), whether water level lowers, and any error codes. Check the sink/disposal connection and garbage disposal knockout to ensure plumbing is clear. 3) Check for simple blockages: remove the lower dish rack, inspect and remove the filter/sump cover and any visible debris (glass, food, broken utensils) that can jam the pump impeller. 4) Access the pump: depending on model, remove the lower kickplate or tip the dishwasher forward after disconnecting water and power. Access the pump motor from underneath or via the tub (follow your model service manual). 5) Visual inspection: look for cracked housing, damaged impeller, leaking seals, or loose/disconnected hoses and clamps. Smell for burnt motor odor. 6) Electrical check: with power restored for testing only (or better: test during a drain cycle), measure voltage to the pump terminals — most US Kenmore/Whirlpool-based pumps get ~120VAC during drain. If you’re not comfortable applying power, skip to continuity testing. With power off, use a multimeter to check for continuity across the pump motor windings (expected a low resistance; an open circuit indicates a failed motor). Also check for short to ground between motor terminal and pump casing. 7) Manual spin test: with power off, try to turn the impeller shaft by hand. If it’s seized or extremely stiff, the pump is mechanically failed and needs replacement. 8) Replace the pump if failed: steps below outline a typical replacement procedure. Follow your model’s service manual for exact panel removal steps. How to replace (typical procedure): 1) Tools needed: screwdriver set, nut drivers, pliers, multimeter, towel, bucket, replacement pump 66577989K703. 2) Disconnect power at the breaker and turn off water supply. Pull dishwasher out from under counter if necessary and place on a towel or cardboard to protect the floor. 3) Remove the lower access panel (kickplate) and/or tilt dishwasher to access underside. Place a bucket to catch residual water. 4) Disconnect the drain hose from the pump (have towel ready) and remove any clamped discharge hose. Unplug the electrical connector from the pump. 5) Remove mounting screws/clips that secure the pump assembly to the sump/tub. On some models you may need to remove the sump or unclip the pump housing. 6) Extract the old pump, noting orientation and hose routing. Install the new 66577989K703 pump in the same orientation. Ensure seals/gaskets are seated properly. 7) Reattach mounting screws, reconnect electrical connector, and clamp the drain hose securely. If your model has a check valve or air gap, ensure those are reinstalled correctly. 8) Restore water and power. Run a test drain cycle and inspect for leaks and proper drainage. Listen for normal pump operation without grinding or excessive vibration. Safety note: If you are not comfortable working with electrical components or lifting the dishwasher, hire a qualified appliance technician. Always cut power at the breaker before opening electrical panels or touching wiring.
Common Symptoms
Dishwasher won't drain; loud humming, grinding or rattling during drain; water remains in tub after cycle; leaks under dishwasher near pump; drain-related error codes.
Common Causes
- Blocked impeller or foreign object jammed in pump
- Worn or seized pump motor bearings or impeller
- Electrical failure of pump motor (open winding or short to ground)
- Leaking pump seal or cracked pump housing
- Faulty wiring or control board not sending power to pump
Popular Parts That Fix This Problem
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Helpful Repair Tip
To confirm the pump is faulty: remove debris and run a drain cycle while listening — a loud hum with no drain usually means the pump motor is getting power but the impeller is jammed or the motor is burned out. Use a multimeter to check for ~120VAC at the pump during the drain cycle; if voltage is present but the motor doesn't run, replace the pump.
Frequently Asked Questions
Can I clean the pump instead of replacing it?
If the symptom is caused by debris jamming the impeller, cleaning the sump and removing the obstruction can restore normal drainage. However, if the motor hums, is seized, shows no continuity, or the housing/seal is cracked or leaking, cleaning won’t fix it — replace the pump 66577989K703.
Can I replace the drain pump myself and how long does it take?
Yes — a confident DIYer can replace the pump. Typical time is 30–90 minutes depending on model and access. You’ll need basic hand tools and must turn off power and water first. If the dishwasher must be pulled out or the underside accessed, allow extra time and consider having a second person to help.
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