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Case Tractors Discussion Forum
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Case 430 3-point hydralics

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Dave F.

03-26-2007 23:02:08




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I replace the seal & wear sleeve on the hydralic piston, (hyrdralic oil in transmission) ( ridge of seal facing in the right direction on piston) about a good 2 months ago. Haven't really used the tractor that much in till recently, I think it still is leaking? (have implement on back of tractor it creeps down some after engine is off) Is there away to do an leak test? on the three point. Could it be leaking back through the control valve? Thanks Dave F.

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Dave F.

03-29-2007 06:27:39




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-26-2007 23:02:08  
Brad, Please explain this pto shaft seal thing to me? I plowed the garden last night, & I checked hydro- oil level & needed to add some, didn't notice any increase of oil level on the transmission dip stick. is there any fluid pressure against this pto seal? If I would park the tractor on an down hill slope would the hydro fluid migrate, back to the hydralic resovior(sp) I am just trying to isolate where the leak is Thanks Dave F.

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bradley martin

03-31-2007 16:39:41




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-29-2007 06:27:39  
The shaft that drives the PTO runs through a hollow input shaft in the transmission There is a seal on it that prevents oil from migrating along it to the rear end housing. We always determine whether it is the 3 pt ram leaking or that seal by doing the overnite settling test that you did. If the 3 pt is still up in the morning than that seal is likely leaking. No, there is no pressure against it, but hydraulic oil being thin it tends to migrate pretty readily. If yu would like I could look in my book and get the number and give you better directions on accessing it. LOL.

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Dave F

04-02-2007 13:40:01




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 Re: Case 430 3-point hydralics in reply to bradley martin, 03-31-2007 16:39:41  
Brad, sometime this week I am going to valve off the the point & do another standing test, that why I know if its the 3-point piston or control valve leaking? I let you know what I find out.I don't look forward to having to split the tractor. Thanks again. Dave F.



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Dave F.

03-28-2007 12:37:00




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-26-2007 23:02:08  
Brad, I just want to make sure I am not dumping a lot of Hydralic oil back into the transmission, before I put the loader back on.( big pain putting it on) hopefully with this seal replaced the hydralics on the loader will work faster. Thanks Dave F.



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bradley martin

03-28-2007 15:53:46




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-28-2007 12:37:00  
Dave; I understand wanting to get it right well you have the loader off, but if it is only settling a fraction ofan inch I would doubt that your leakage is going to be significant. A more common point of transfer between the hydaulics and the transmission occurs around the seal on the PTO drive shaft. The later models actually had a pan and drain tube to return any leakage from the cylinder to the front compartment. Lots of luck

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bradley martin

03-28-2007 06:24:33




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-26-2007 23:02:08  
Hi Dave; If it is opnly settling 5/16 of an inch with a heavy load overnight, why worry about it. I don't think that is significant enough to warrant much concern. If you recently rebuilt the lift ram it may take it while for the seals to seat properly.



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Dave F.

03-28-2007 06:14:53




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-26-2007 23:02:08  
Put the heavy 2 bottom plow on the 3-point day before yesterday, raise the plow & left it there 24 hrs latter the plow drop (crept down) about 1/4 to 5/16 of an inch. going to raise it up again than support it with an jack then plug off the hydralic line going in to the hitch & remove the jack & give it another standing test for 24 hrs. any other suggestions or ideals Thanks Dave F.



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bradley martin

03-27-2007 02:23:21




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 Re: Case 430 3-point hydralics in reply to Dave F., 03-26-2007 23:02:08  
Yes, it is possible that the control valve is seeping. I guess the only way to know for sure would be if you could plumb a simple valve between the tractor valve and the lift cylinder to see if that stopped the settling. If it does, you know for sure what your next job is.



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