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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD350C Reverser

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HOSSFLY

10-17-2007 08:22:53




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I need some help on my JD350C Loader. The roller bearing at the front end of the shaft on the reverser locks up. The first time it was stuck in forward gear. When I pulled the engine out and looked at the reverser I saw that the bearing was in pieces. The cage was black from heat and it was torn apart / locked up. Replaced the bearing and it seemed to run fine. While digging a small pond it repeated the bearing incident. Took it apart again and replaced the bearing and while I was in there the oil pump. I found metal shards from the first bearing in the spool and in the low pressure oil flow hole going through shaft"s center. Cleaned all of this out figuring that this stopped oil from getting to the bearing thus causing the failure. Put it back together and put gauges on to test the oil pressure. The high pressure side was fine at 130 psi as per the manual but the low side would not register the 17 to 30 psi as required by the manual. The needle barely moved. While this test was being conducted the bearing failed again after 1 minute of running the engine. I am convinced that it is still not getting oil to the bearing. I checked the spool it looked good, I also adjusted / shimmed the adjustment plug as per the manual but still no luck with the pressure. Does anyone have any experience with this and any ideas on why no oil is getting to the bearing? Thanks.

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jdemaris

10-17-2007 11:04:32




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 Re: JD350C Reverser in reply to HOSSFLY, 10-17-2007 08:22:53  
I need a little more history and info. First of all, there is NO roller bearing in there - just an adjustable Timken-style bearing cone and cup assembly. And "adjustable" means just that. Between the input shaft and output shaft there are three sets of them - all in-line. The correct - or incorrect adjustment affects them all. I'm suprised you burnt up the front bearing without damaging the center-bearing since the center-bearing is smaller. The only roller-bearing in that reverser is for the one reverse idler-gear. When the reverser is together - with all adjustable bearings known to be good - the input shaft needs to have .002" end play. You don't want much more, and you certainly don't it tighter - putting a preload on those bearings. I'm wondering if you've had this thing all apart, put a new output shaft in, and forgot to install the oil-orifice? If you forgot it, it will never be able to maintain any lube pressure. Also, if it IS there - it only has an oil passage the size of a pin-hole. Maybe it's plugged.

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