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Old 11-23-2022, 07:01 AM   #1
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Join Date: Mar 2009
Location: Apollo Beach & Key West , FL
Posts: 3,410
Autopsy on dead slide out motor/gearbox

A few weeks ago on our next to last night of our 3+ month trip the slideout motor on the living room drivers side slide crapped out. I could hear the motor running, but no movement in the slide. Got out the tools and loosened up the trans torque fittings and rolled the slide back in so we could travel. Since repair parts are not offered by newmar, I ordered a new motor/gearbox and installed. All is well. Yesterday I had some time so I took the old,failed unit apart.
What i found was one of the gear shaft roller bearings failed, allowing the gear shaft to wobble, causing it to bind and break a tooth and then jam which then caused the PLASTIC gear that is driven by the motor to be stripped of teeth resulting in the motor just spinning.
For a low speed, high load application I would have thought bronze bushings would have been a better choice. And the use of a plastic gear is questionable. Sure, it could protect the rest of mechanism by stripping out the teeth , but why, since there are no replacement parts available anyway. I would think a better way would be to have a metal gear and shear pin.That way, the user could repair it, if needed. Anyway, the culprit was the roller bearing. You can see in the pic, the only thing left in place was the outer ring, the rollers scattered about and the cage was busted up. Here's a few pics showing the remains of the bearing, a couple rollers, the chewed up plastic gear. ... and it was only $1129 to buy a replacement unit.
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Old 11-23-2022, 07:15 AM   #2
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Here's the same pic with an arrow showing where the destroyed bearing was.
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Old 11-23-2022, 07:42 AM   #3
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Did you clean the plastic gears good and look for any markings, might get lucky and find a replacement.




My front slide motor quick and at the time didn't have time to tear into it, best i could do was buy a replacement for $900. Threw the old one in the basement and about 6 months later when I had time I thought what the heck and took the electric motor apart. A little dirty but couldn't find really anything wrong. Cleaned it up, reseated the brushes, put back together and it worked. So now I have a spare.
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Old 11-23-2022, 09:24 AM   #4
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Quote:
Originally Posted by jacwjames View Post
Did you clean the plastic gears good and look for any markings, might get lucky and find a replacement.




My front slide motor quick and at the time didn't have time to tear into it, best i could do was buy a replacement for $900. Threw the old one in the basement and about 6 months later when I had time I thought what the heck and took the electric motor apart. A little dirty but couldn't find really anything wrong. Cleaned it up, reseated the brushes, put back together and it worked. So now I have a spare.
Unfortunately, not only the plastic gear is damaged but also two other gears are missing teeth so it's basically throwaway or a limited parts donor
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