Along with correct spring tension and brush hieght you must have the surfaces free from small pits and as even as you can, this can be done by rubbing the brushes on a piece of sand paper to remove uneven or small pit marks. Remember the more contact that the brushes make the better the motor turns.
Lee F.
Watch the armature very carefully as you reverse the engine,Does it(armature) move up and down excessively at the point when the direction changes ? If so check the armature shaft lenght above the commutator and below the windings with the origional if you still have it.. I had a problem with an armature doing the same thing. I used some small nylon washers (con 8,I think) to stop this movement. I placed them above the commutator and things worked well. You might have to try it a couple of times to get the right amount of pressure and not to much bind.
Ed
Andre,
It sounds to me that the problem is being caused by the brushes and/or brush springs. Is one brush longer than the other? Usually, the problem you have described is caused by uneven pressure on the commutator. This will cause the motor to run better in one direction than the other. The uneven brush length could be caused a brush spring applying too much or not enough pressure on a brush, or it may just be that the motor was run more in one direction than the other. Regardless, replacing the brushes and springs should solve the problem. Just be sure to replace both brushes and both springs. If you don't, the uneven performance could still exist.
Jim
Hi to all
Does anybody know, if can I use a postwar field with MPC armature?
Because I did, and work realy bad, the power is very weak when I try to pull just three postwar cars.
the interesting thing is just happen in one direccion, the e-unit was cleaned twice, so is not theproblem.
Thank in advance
Andre.
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