Drum will spin slow after replacing carbon brushes
Hi. I replaced the carbon brushes on my washing machine. Now it wont spin at full speed. ı measured the rpm it is only 300 instead of 1200. I have checked the belt it is tight. My machine is samsung wpc1802.
What can be the cause of this?
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Samsung WPC1802 spins only slowly after carbon brush replacement
- The problem
- After replacing the carbon brushes, the washing machine would no longer reach full spin speed. The reported speed was about 300rpm instead of 1200rpm. The drive belt was checked and reported tight. Model given: Samsung WPC1802.
- Likely cause
- Most strongly supported diagnosis is an issue introduced during the brush replacement, such as incorrectly fitted or sticking brushes, poor brush contact with the commutator, or disturbed motor feedback wiring. A missing or faulty tacho signal was also suggested as a likely reason for the motor not accelerating properly.
- What fixed it
- Recommended action was to re-check the new brushes for correct type, free movement, spring pressure and correct orientation, inspect the commutator condition, and check the motor connector and tacho coil/magnet wiring for anything loose or disturbed. If these checks do not identify the fault, a faulty tacho coil or motor control board was suggested. The exact repair was not confirmed in the discussion.
- Checks to try
- Measured spin speed at about 300rpm instead of 1200rpm
- Drive belt checked and found tight
- Advice to re-check carbon brush fit, movement and orientation
- Advice to inspect commutator condition
- Advice to check motor plug, wiring and tacho coil/magnet
- Advice to run a spin with no load
- Parts or tools mentioned
- carbon brushes
- drive belt
- motor plug/wiring
- tacho coil
- tacho magnet
- motor control board
Safety: Isolate the washer from the mains before removing panels or touching the motor. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
If it spun properly before the brush change, the first suspicion is something disturbed during that job rather than a major new fault. Slow spin after fitting brushes is often down to brush fitting, motor feedback, or the control not “seeing” the motor correctly.
1. Isolate the washer from the mains before removing any panels or touching the motor.
2. Re-check the carbon brushes: - Make sure they are the correct type and length for the motor. - Check both brushes slide freely in their holders and the springs are pushing them onto the commutator properly. - If one is sticking, the motor can run weakly and fail to ramp up. - Also make sure each brush was fitted the right way round. Some brushes have an angled face and if fitted incorrectly they can make poor contact.
3. Inspect the commutator: - Look at the copper segments on the motor armature. If badly burnt, grooved, or dirty, new brushes may not bed in properly. - A light clean can help, but if the commutator is badly worn the motor may still not reach speed.
4. Check the motor plug and wiring: - Make sure the connector is fully seated and no wire has been pulled loose. - Pay particular attention to the tacho coil wiring on the motor. If the tacho signal is missing, the machine may only turn slowly or fail to accelerate.
5. Check the tacho magnet/coil: - On many motors this is on the rear of the motor. If it has cracked, come loose, or been disturbed during brush replacement, spin control will be affected.
6. Run a spin with no load: - If it behaves the same empty, that points more toward motor/feedback/control than an out-of-balance issue.
If the brushes and tacho wiring all check out, the next possibilities are a faulty tacho coil or motor control board. If you are not confident testing live circuits, it is best to get a qualified appliance engineer in. Any mains electrical work should be left to a properly qualified person.
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This answer was generated automatically by the WhitegoodsHelp AI Assistant. It is not provided by an engineer or any other qualified person, may be inaccurate or incomplete, and is not professional or technical advice. Do not rely on it. Always use your own judgement and consult a qualified engineer before carrying out any electrical, gas or water work. Use is entirely at your own risk. See our full Terms of Use.
SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
Know your limits
If you are not confident testing or working inside the appliance, stop and call a professional.
AI guidance, not guaranteed
This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
This is general information only and is not professional advice. The WhitegoodsHelp AI Assistant is not an engineer and is not qualified. See our full Terms of Use.
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