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Reply to "Overheating Bridge Rectifier on TAS SAW Board"

Ralph, with the motors off the trucks spin the flywheels with the lightest touch you  can and compaire the difference. If one is a bit tighter than the other pull it up and down against the can and the shaft should move in and out of the can freely about 1mm no more than two.  With the motor running slow look at it from the side do you see any wobble from the flywheel ?  The solution may be as simple as a drop of oil on the motor shaft at the bearings.   The worms are a bixxxxch to remove and just as bad to press back on. If you have a VOM run the motors 30 sec or so to remove oxidation from the commutator. Then check the static resistance of both motors they should both read about 3-3.5 ohms for a twin motor MTH loco. Spin the shaft and test 3-4 times for an average.   You can find MTH motors on eBay cheap. Make sure to buy two that came from the same loco.  ask the seller up front about this.  Don't buy two motors that came from single motor locos.  While it's apart clean and relube the trucks. I don't know what the chinese use for lube but have noticed gum deposits on the shaft where it exits the bearing. Common 20 or 30 weight motor oil is excellent on the motor bearings it is gum free I have loaded a pin point oiler with it and used it on motor bearings for years it doesn't gum up.          j

Last edited by JohnActon

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