Shihlin Motor Brushes

[RichardM333]

I own a Hoveround XHD power wheelchair. I'm trying to identify the size of new motor brushes for a Shihlin 24V motor, TYPE - A9Y1X 06971. The brushes that are currently in the motor after 980 hours of use measure 6mm x 8mm x 20mm. Can anyone tell me the length of a new brush for this motor? I'm guessing it might be 24mm, but I'm not sure. Can anyone tell me where I can purchase replacement brushes? Thanks very much.

[martin007]

Where are you from?

What does the brushes head look?

[RichardM333]

I'm in Virginia. The brush head has a curved look. i bought the scooter four years ago. It ran very fast. It has slowed down a lot. I put new batteries in it and there is no improvement in speed.
The motors need new brushes, the dust blown out and the contacts polished.

[martin007]

A photograph would help us...
Find a local seller on eBay.

[Burgerman]

New ones are normally available from any place that sells those chairs.
If they are obviously worn short (or almost zero spring pressure when refitting) chipped or worn at strange angles, or if the motor is full of carbon and dust then yes replace. If they are a few mm shorter, otherwise healthy leave alone. They wear into the commutator as a set. And should be put back the same way in the same places.

How long they start out? No idea! But they normally last a lot longer than 1000 hours. Thats only 1 hour a day for 2.5 years.

2 poles die and burn up much faster. 4 pole motors usually run many years without issue.

Over the years motor lose efficiency in gearboxes, in the magnets losing strength. Then battery impedance too high makes them slower (new batteries if cheap will likely be worse than decent old ones) And users tend to get heavier over time...