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Bachmann O Gauge Motor Question

G GynotaiOGR Forum Member
Hi everyone.  Thank you for validating my password.

I have a Bachmann engine that uses the 'can' style motor.  The problem I'm having is it never starts by itself.  You always have to touch the flywheel on the motor to get it to start moving.  As far as I can tell, there isn't a dead spot in the armature because when I run the motor and load it down with pressure from my finger, it never has any interruptions that would be associated with a dead spot.

I did open the motor and completely cleaned the contact points where the brushes make contact to the armature, as well as removed any imperfections on the brushes themselves.  Although this was not easy to do, after I was finished, the motor still ran the same way it did before I opened it.

Is this something these motors just do over time?   For full disclosure, this motor at one time worked fine, then started doing this.  Full throttle on my train is about 13vdc.

Thank you for taking the time to read this.

Thom
(Gynotai)
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G GGGOGR Forum Member

Starting current required on a motor can run 4-5 times normal operating current.  I have seen this behavior on DC can motors.  I imagine if you had a higher value voltage available you could get the motor to turn by applying higher voltage to get it going.

 

I just think the motor is worn out and your not going to be able to fix it, especially since you tried cleaning and dressing brushes already.  Chances are the armature winding have some issue.  G

PP Prewar PappyOGR Forum Member
Originally Posted by GGG:

I just think the motor is worn out and your not going to be able to fix it, especially since you tried cleaning and dressing brushes already.  Chances are the armature winding have some issue.  G

GGG,

While I'm not a service tech, you're correct. I ran into this problem twice on engines brought to me for repairs. Both were older Wms not the newer WbB.

P phillyreadingOGR Forum Member

Have you checked the center rail rollers and the truck mounting screws?

Also have you checked for loose wiring?

Another thing to go wrong with Bachmann/Williams is the circuit board inside for motor control.

 

I have about 12 before Bachmann engines by Williams and don't have any problems with any of them. The D.C. can motors work very well.

One minor problem I had was with traction tires on a diesel engine and I solved it by adding a wiring harness to the engine behind as I was running two engines together.

 

Lee Fritz

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