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 Posted - May 08 2009 : 6:33:14 PM
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I recently tore down a motor from an HO Cab Forward to try & solve an intermittent start/stop problem.
Its the round motor with the small offset gearbox on the front.
I now have it tested & running smoother & wish to 'slide' [tap?], the pinion back on to the motor shaft.
Are there any 'tricks' you motor tinkerer's use to get it back on, such as heat the pinion in an oven??
Thanks
Tanked
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Posted - May 09 2009 : 10:36:57 PM
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| Center on shaft and push down with needle nose pliers CAREFULLY
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Posted - May 10 2009 : 02:23:24 AM
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It should press back on.
I use my drill press as an arbor press.
If it doesn't fit tightly on the shaft you can use Loc/Tite or I have knurled shafts with a sharp file by dragging the file across the shaft and letting the shaft turn as you do it
If the gear seems to tight to press on the shaft you can heat the gear with a soldering iron as you press it on.
Ray
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Posted - May 10 2009 : 11:31:14 AM
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| Heat the gear as Ray said, if that's too tight still, chill the motor in the fridge. No kidding, the heat expands the metal, the chill contracts it---an old scratchbuilder's trick. Make sure you allow the motor to get back to room temp before firing it up to avoid shorting it out with any condensation.
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Posted - May 11 2009 : 08:23:25 AM
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All good advice, and you can also try resting the gear on a scrap of wood, and carefully tap the motor shaft on the brush end with a hammer to seat it. Be sure the shaft and gear are in line with one another.
This avoids marring the gear, but just be sure to tap the end of the shaft and not the brush holders or any part of the housing. If it's like their other offset boxes, the gear is brass. Rivarossi's gears were usually a very tight fit.
The Tyco Depot
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Posted - May 22 2009 : 10:35:59 AM
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quote:All good advice, and you can also try resting the gear on a scrap of wood, and carefully tap the motor shaft on the brush end with a hammer to seat it. Be sure the shaft and gear are in line with one another.
This avoids marring the gear, but just be sure to tap the end of the shaft and not the brush holders or any part of the housing. If it's like their other offset boxes, the gear is brass. Rivarossi's gears were usually a very tight fit.
Originally posted by NickelPlate759-May 11 2009: 08:23:25 AM
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It actually eased back on without much effort. Which bothers me, re slipping. Loctite - which one of their many products should hold it firm on the shaft??
Tanked
Tankef
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