LG WM4370HKA Washer Tub Bearing & Seal Kit – What Part Fixes This Problem?
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Understanding the Problem
Brief explanation: Front-load washers like the LG WM4370HKA use bearings and a tub seal to support the inner drum and keep water in the outer tub. Over time bearings wear and seals degrade. When bearings fail, the drum will rumble, wobble, or make grinding noises during spin; when seals fail you'll get water leaking out of the door area or pooling under the machine. A bearing/seal/gasket kit replaces the worn bearings and seals to restore quiet operation and stop leaks. Step-by-step diagnostic and repair steps: 1) Confirm symptoms: Unplug washer and rotate the drum by hand. Listen for roughness, grinding, or scraping. Push/pull the drum laterally (front-to-back and side-to-side). More than 1/4"–1/2" play or rough rotation indicates bad bearings or hub wear. 2) Check for leaks: Inspect the door boot gasket for tears and look under the front of the washer for water residue and grease. A torn tub seal will often show grease or water at the bottom front or under the machine. 3) Access the tub: Disconnect power and water, move the washer so you can work around it, and tilt or remove the top and front panels to access the door boot and front of the outer tub. 4) Remove the door bellows (boot): Release the inner and outer clamps (usually spring clamps or band clamps) and peel the boot away from the outer tub to access the inner tub and spin assembly. 5) Remove inner tub assembly: Remove the detergent drawer/console components if needed, unbolt the inner tub from the shaft/hub and lift the inner tub out. On many LG front-loaders the inner tub is bolted to the hub and will come out as a unit. 6) Decide repair method: Bearings are typically pressed into the outer tub. DIY options: a) Replace bearings and seals in the existing outer tub using a hydraulic/bench press or an arbor press and correct-size drivers. This is the lowest-parts-cost option but requires tools and a clean work area. b) Replace the entire outer tub assembly (outer drum) pre-assembled with bearings and seals. This is easier but higher parts cost and sometimes more reliable for home repair. 7) Remove old bearings and seals: If pressing out, use a bearing puller or drivers and press to remove the inner/outer bearings and the seal. Clean the bearing bores thoroughly and remove corrosion. Inspect the shaft/hub for scoring—if the hub is worn you may need to replace it or the whole outer tub. 8) Install new bearings and seals: Use a proper bearing driver or press. Install the outer bearing first, then the inner bearing, then the tub seal. Make sure bearings are fully seated and the seal lip faces the water side. Apply a thin layer of appropriate waterproof bearing grease to the bearing OD where required (follow kit instructions). 9) Reassemble: Reinstall the inner tub, torque hub bolts to OEM spec (if available), reinstall the door boot and clamps, reattach front/top panels, reconnect hoses and power. Run a short spin-only test with no load to confirm quiet operation and check for leaks. 10) Final check: Run a full wash and spin cycle on an empty load to verify no leaks and no abnormal noises. How to fix (practical tips): - If you don't own a press, either rent one, use a local machine shop to press bearings, or replace the full outer tub assembly to avoid pressing. - Replace both bearings and the seal together; replacing only one part often leads to repeated failure. - Clean all mating surfaces and remove rust/corrosion before installing new parts. Use threadlocker on fasteners where OEM specifies. Safety note: Always disconnect power and water before starting. Bearings/seal replacement often requires heavy parts and tools (press, pullers). Use proper eye protection and gloves. If you are not comfortable with pressing bearings or removing the tub assembly, hire a qualified appliance tech.
Common Symptoms
Loud rumbling or grinding during spin, excessive drum wobble or lateral play, water leaking from the front/bottom of the washer, grease on the door gasket, and sometimes a burning or metallic smell during spin.
Common Causes
- Worn or corroded drum bearings due to age, water intrusion, or heavy/unbalanced loads
- Torn or hardened tub seal (gasket) allowing water to reach bearings
- Damaged hub or outer tub (scoring/corrosion) that prevents new bearings from seating properly
Popular Parts That Fix This Problem
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Helpful Repair Tip
Rotate the drum by hand with the door open: a loud grinding or roughness and more than ~1/4" lateral play strongly indicates worn bearings. A visible smear of grease or water at the bottom front of the boot points to a failed tub seal.
Frequently Asked Questions
Can I replace the bearings and seals myself without special tools?
You can do much of the disassembly at home (remove panels, boot, inner tub) with basic hand tools. However, pressing bearings in and out requires a bearing puller and an arbor or hydraulic press and proper drivers. If you don't have access to a press you can: 1) take the outer tub to a machine shop to have bearings pressed, 2) buy the full outer tub assembly pre-assembled with bearings/seals and swap the tub, or 3) hire an appliance tech. Attempting to hammer bearings in/out without correct drivers risks damaging the tub and bearings.
Is it better to replace just the bearings and seal or the entire tub assembly?
If the outer tub bore and hub are in good condition (no deep corrosion or scoring), replacing bearings and the seal is cost-effective. If the bore is corroded or the hub is damaged, new bearings won't seat reliably—replace the entire outer tub assembly. Replacing the whole tub is easier for many DIYers (no press required) but is more expensive. Inspect the bearing bores carefully before deciding.
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