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JDB Transmission

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Tom Waugh

01-29-2000 22:44:48




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I have a 48 B that slips out of the higher range gears. The Gears look okay but don't hold. The lower gears hold okay. Also when I apply the right brake I hear slight gear noise or grind. Is the overdrive shift fork not holding the higher gears in place? I have to shift out of the higher range and into the lower range to get back into the higher range. Once it stuck and I couldn't shift at all. Thanks for any help.

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Chuck

01-30-2000 05:21:30




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 Re: JDB Transmission in reply to Tom Waugh, 01-29-2000 22:44:48  
wish I could say it is just a detent or something simple, however it sounds like you have a lot of wear on bearings, and also may have some end play problems. I've had many of these apart. Probably if you going to keep the tractor, I'd recommend that you do a tear down. Tighten up end play of lower shaft by bearings and removing gaskets. Also while you're in there you may want to install a locker kit. Was used on the mid 50 JDs on up to keep the tractor from coming out of gear, 1 &3. I'd recommend you find someone locally that has done this and check all this out.

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clooney

01-30-2000 05:21:21




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 Re: JDB Transmission in reply to Tom Waugh, 01-29-2000 22:44:48  
Tom,it could be worn bearings on the " sliding gear shaft drive gear" the "B's" have a habit of wearing these bearings out. It could also be the detent "ball", "spring", or "notch in underdrive shifter shaft", or worn bearings on the sliding gear shaft,or all of the above. The easiest thing to check is to pull the little cover on the right side of the reduction gear cover (it lines up with the sliding gear shaft) and look at the bearing under it. If it's bad there is a pretty good chance the inner bearing is bad too. If all the parts look good you can install the late 50, 520 under drive shift fork & related parts, they have an inter-lock to keep them from jumping out of gear. As for the brakes, if it only grinds with the r/h brake it is probably a worn out brake lining on that side.

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