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Discussion Forum
Show Parts for Model:

Re: Case 430 cracking hydraulic pumps

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hondaracer2oo4

11-10-2012 16:00:33
50.133.188.31



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Thanks guys,
The tractor is currently at my father in laws so I can't take a look at it or take pics for a couple days. I have a service manual for the Model 22 loader and backhoe. The literature is consistent as far as how the backhoe and loader look but the manual says that they loader is run off of the hydro pump for the eagle hitch and the backhoe is run off of a pto driven hydro pump on the back of the machine. Both of these statements are wrong since the hydro pump is front mounted to the tractor. I will have to get a look and follow the piping to find where everything goes and in what order. So if they pressure line goes first to the loaders control valve that means that the main relief valve will be in that, if it goes to the backhoe control valve then that means that the main relief is back there? Also I just wanted to sum up that everyone seems to think that the reason for the cracked pump is that the main relief being set to high? After I put the replacement pump in I ran the loader up and down without issue, then I when to put the rear stabilizers up and when it hit the top of the stroke the engine stalled, I figured that the throttle was just to slow so I started it back up, moved the throttle up a bit and put the stabilizer all the way down and when it bottomed out is when the pump cracked. Thanks!
This post was edited by hondaracer2oo4 at 16:07:33 11/10/12.

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Case Nutty 1660

11-10-2012 16:11:26
75.127.24.27



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 Re: Case 430 cracking hydraulic pumps in reply to hondaracer2oo4, 11-10-2012 16:00:33  
yes I would say some one really cranked down on the main pressure relief way to much on the pump, that is why we always screwed a guage in to the system before changing any relief cnt



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