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Case Tractors Discussion Forum
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300B brake problems

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Jim McVay

07-05-2009 13:24:37




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I'm fixing up my uncle's 300B and he was having problems with the left brake locking up and would not disengage until you backed up. I disassmbled it and all looked OK. New brake disc and no rust. I did find about 3/16" of end play on the splined shaft the disc mount onto. I think there should be not end play on the shaft as I think it keeps the ring gear in positoin. Could the loose shaft cause the brakes to lock up?

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ChevCase

07-06-2009 08:02:10




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 Re: 300B brake problems in reply to Jim McVay, 07-05-2009 13:24:37  
I had the same problem with a 300B and I found on this forum that the small springs that hold the steel brake plates together get weak and will allow the steel ball bearings to go momentarily out of postion when brakes were applied. It would not unlock until I came to a complete stop. The springs are still supplied by Case/IH.



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Jim McVay

07-05-2009 18:58:04




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 Re: 300B brake problems in reply to Jim McVay, 07-05-2009 13:24:37  
I have a big 400 that I had to gut the tranny and start over. I used the best out of 4 traanies and ended up with a row crop 400 with an orchard ring and pinion. She will run about 25 MPH. I'm the Shop Manager for a large farm in south Florida. The farm mis 29,000 acres with 8,000 acres of Citrus. I understand what you are talking about. I just thought when the ring gear carrier was changed by my uncle years ago he just did not shim it correctly but you are probably right about the thrust washer. Thanks.

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mEl

07-05-2009 15:08:28




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 Re: 300B brake problems in reply to Jim McVay, 07-05-2009 13:24:37  
If you have that much play probably the fibre spacer has failed between the ring gear carrier and the LH side gear, this will indeed allow the backlash to go way out of spec and could cause an expensive repair if not corrected. You probably have seal leakage as a result of all the shaft movement. Replacement thrust washers are steel and are selective to set your spider clearance then the whole setup procedure must be done to reestablish the backlash and differential rolling torque. You need a manual and a dial indicator to do this any kind of right. PS the whole rear needs gutted to get the bull gears out so the side gears can be removed, Hope you have some good mechanical skills. mEl

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