Re-wheeling USA trains motor blocks - myLargescale.com > Community > Forums

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Old 03-19-2008, 02:24 PM   #1 (permalink)
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Default Re-wheeling USA trains motor blocks

Hi,

Has anyone done this? As far as I can tell the wheels must be shrunk/pressed on - I haven't tried a puller on them yet, it looks like a one-way experiment, but the only options seem like either that, and hope not to damage the axle, or cut the wheels off (and hope not to damage the axle..).¬* Then there's fitting the new ones..

Thanks,

Jonathan
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Old 03-19-2008, 08:15 PM   #2 (permalink)
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Default RE: Re-wheeling USA trains motor blocks

Each half axle is pushed straight into the sleeve on the pinion gear, but it is a very tight fit. The fit is so tight it is not unusual to see a split in the gear sleeve. Unfortunately that will allow the axle and wheel to slip under load. Over time the axle will work its way out of gauge, wobble and cause derailments. If you can turn a wheel with your fingers, the gear sleeve is split.
¬*

¬*
I repair mine with monofilament fishing line and Super Glue. When replacing the axles, there is a stop in the sleeve so the wheels are evenly spaced and properly gauged.
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Old 03-20-2008, 02:22 PM   #3 (permalink)
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Default RE: Re-wheeling USA trains motor blocks

Thanks - If I need to repair any, at least I know how to now.¬* Looks like voluntarily changing the wheels (I had some nice 38mm 10-spoked ones, with con-rods, in mind) is a non-starter, it'd be easier to start fresh..

Thanks again.
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Old 03-23-2008, 11:30 AM   #4 (permalink)
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Default RE: Re-wheeling USA trains motor blocks

A short note: Pressing the USAT train half axles all the way in will result in a tight or even out of spec back to back gauge.

I strongly suggest using a set of calipers to achieve your desired back to back.

I have a page listing all the NMRA and G1MRA specs that might be of help:

http://www.elmassian.com/index.php?o...d=85&Itemid=95

Regards, Greg
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Old 03-23-2008, 04:47 PM   #5 (permalink)
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Default RE: Re-wheeling USA trains motor blocks

Greg is correct. I have about 40 USA locos and 99% of them the gauge is correct, but I do have a few that with the wheels pressed all the way into the axle they are to tight back to back. So watch what you do or you will have problems at turnouts for sure.¬*

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