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Help from experts

PeterAPeterAOGR Forum Member DIGITAL SUBSCRIBER

I recently acquired a 736 Berkshire.  Looking at the rollers, it appears to have had little run time.

Upon testing, it ran but barely.  Checking it out, the E unit was working fine, the brushes were new and the commutator was clean.  Taking the motor out, there seemed to be too much play through the housing.  Checking the shaft on the gear side, it looked like there was too much. So I added a washer to reduce it a bit.  Retesting the loco, again it ran better, but as soon as I added a train, it didn't have enough "power" to pull anything but itself.

Any suggestions as to what might be the problem and a solution.  This is a first for me after servicing many, many locos.

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DJ David JohnstonOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Check the resistance on the commutator, bar to bar and bar to shaft. The bar to bar resistance should be about equal, within 0.2 ohms. The bar to shaft resistance should be very high, maybe 100,000 ohms or more.

Another thing to check on the 736 is the clearance between the worm and the worm wheel. Lionel made special washers to adjust this clearance. This is addressed in the maintenance manual.

It never hurts to check the driver quartering. If a wheel gets out of quarter it can cause binding in the side rods and slow the engine down. This can be caused by a wheel that is loose on the axle. Try running the engine without the rods and see if the performance improves.

PeterAPeterAOGR Forum Member DIGITAL SUBSCRIBER

Thanks gents.  I've considered the tension on the brush springs and adjusted them and minimized the movement on the worm by adding a washer and that at least got it running.  I will go back to the resistance on wheels and side rods.  Keep on trying, it is too nice an engine to give up on it.

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