Carbon brushes fitted but won't spin fast enough
I have fitted 2 new carbon brushes, which were completely worn out. But now it doesn’t seem to spin fast. It almost gets up to speed but then just slows down again. I’ve changed the brushes round, and it all appears to be lined up.
any advice please
Solution Summary
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This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Washing machine still will not reach full spin after new carbon brushes fitted
- The problem
- The washing machine had completely worn carbon brushes, which were replaced, but the motor still only almost reaches spin speed and then slows again. The brushes were swapped round and appeared correctly aligned.
- Likely cause
- The accepted reply says that if the motor is sparking heavily, the fault is likely within the motor. If there is no significant sparking, the cause could be the PCB or another issue. It was also suggested that no-load or unbalanced-load conditions, or a pressure system fault, can prevent proper spinning. The exact cause was not confirmed.
- What fixed it
- Recommended checks were to observe whether the motor is labouring or sparking during spin, ideally with a full load in the drum, and to consider that the brushes may not have been the original cause if they were worn but not charred. No confirmed repair was posted.
- Checks to try
- Observed that the machine almost gets up to spin speed but slows down again
- New carbon brushes fitted after the old ones were completely worn out
- Brushes were swapped round and appeared lined up
- Check whether the motor is sparking a lot during spin
- Check whether the motor is labouring during spin
- Try the machine with a full load in case no-load or unbalanced conditions are affecting spin
- Consider a pressure system fault if spin is inhibited
- Parts or tools mentioned
- Carbon brushes
- Motor
- PCB
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
2 Answers
If the motor is sparking a lot the fault is with the motor, but if not, and especially if this fault was present before you looked at the brushes, it could be the pcb or something else.
If neither of the brushes were charred, it's unlikely they were causing a fault, although obviously if worn down would need replacing soon.
Try these articles
Problems after fitting carbon brushes
Fitted brushes now motor sparking
Need Professional Help or Spare Parts?
Also, sometimes a washing machine will not spin if it has no load inside the drum, or if the load is unbalanced, or if there's a fault on the pressure system. Put a full load inside and when it gets to spin see if the motor is labouring or sparking (very small sparks shouldn't be a concern).
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