I just did a upgrade on a Custom Trains FM Diesel Electric, this is my sixth upgrade, my second diesel. The motors do not turn togeather untill 20-30 mph. The tach reader is on the rear motor, both trucks have traction tires. I oiled & greased the gears on the trucks I'am running it on roller bases, on the track the front truck rides up & derails, because the motor is not turning. Help thank you MONK
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This is an exact copy of a post I just entered for another identical issue.
For the jerky motor, try first manually turning the flywheel through at least a couple of complete rotations of the drive wheels and see if you feel any binding. Try it in both directions.
If not, my next test is to remove the motor plug and connect a bench DC supply to the motor and run it at very low voltage, around a volt to start. Crank it up slowly and see if it start running smooth or is jumpy. Do the same thing with the properly working motor and see if you see any difference.
Obviously, one of the first things to check is if the motor mounting screws and the motor mount screws are tight. You'll have to remove the motor to get to the two motor mounting screws. I've found a number of these loose, as well as the bottom screw that secures the motor mount.
Was the engine used. If not mechanical the motor may be bad. You can also do a visual inspection of the rotor. If the copper windings are discolored it is a sign of over heating. You can also measure the resistance of each motor and see if one is off. G
Checked out the motors & lubed. What I found was the traction tires were coming off.
Time to get out the black RTV. thanks Monk
Traction tires falling off will certainly affect running!
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