Whilst doing work on the pickups on the Lima Class 117 DMU I thought I might as well give the motor a bit of a service. Not that there is much to do on these old pancake motors but it was worth opening it up as I found this.
The blackish ring is dirt on the commutator which needs to be cleaned off as it is affecting contact with the brushes supplying power to the motor.
That was soon done with some fine abrasive. With the cover back on having lightly lubricated the spindle, I turned my attention to the other side of the motor casing and the gear wheels. They needed a light greasing but also, Lima gear wheels are renowned for having these ejector pin marks on them from the manufacturing process. The edges can stand proud of the surface and cause uneeded friction with the rest of the gear train. I used a fine sanding stick to smooth them down
After reassembly I used a 9volt battery, whose terminals conviently match the two brush holder points on the motor, to test that it all still worked which amazingly for my work it did!
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