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Case Tractors Discussion Forum
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Case 450C hydraulic problems

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Richard Johnsto

07-27-2004 20:00:40




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I have a Case 450C dozer that is having a bad day. The blade controls wont work. It acts like it isn't getting enough hydraulic pressure, when you try to pick up the blade all that happens is the slack in the cylinders pull out. The transmission is working fine. Does anybody out there have a hydraulic diagram or troubleshooting for this problem?




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Joe Ward

07-31-2004 20:34:10




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 Re: Case 450C hydraulic problems in reply to Richard Johnston, 07-27-2004 20:00:40  
Richard,your problem is most likely in the pressure relief valve. If you tear your entire valve body down, clean it, and replace all seals it should fix your problem. Also, I may have a full set of manuals that I could have copied. Send me an e-mail let me know which you are interested in as there are about 500 pages in my book.



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Richard

08-23-2004 23:37:02




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 Re: Case 450C hydraulic problems in reply to Joe Ward , 07-31-2004 20:34:10  
Joe-
Sounds like you are the person I need to talk to. My fingers werent working good when I posted my problem. The dozer is a Case 850B not a 450c. I tore the hydraulic controll valve all the way down and found a broken spring in the flow control part of the valve. I put everything back together and the blade controls all worked fine till the next morning. Then it was the same thing. I tore everything down again and checked and cleaned it and put it back together about four times and the blade still didn't work. Here's where it gets weird. I put the dozer in gear and moved about 6 inches and everything started working again. In the process of tearing everything down and putting it all back together, I'm pretty sure that I didn't get everything adjusted back like it needs to be. Such as the pressure relief valve and the pressure control valve. If you have any information on how to adjust these valves it would be greatly appreciated. The dozer has a 3 spool valve. I have also been told that the "power beyond" valve coud have some blown O-rings. Where is this valve located?
Thanks-
Richard Johnston

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