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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Super 55 Hydraulics Cont.

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Matt Kane

05-18-2007 17:12:44




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I did the press test. What I found is leakage on the end of the valve spool. Everywhere else tested okay. Im not sure what my options are now. I don"t know where to get the parts for it. Can o-rings be used in the valve to seal it up? Or for now can I just use heavier fluid. Im out of money and I would like to get it fixed. I did put in a new seal in the hydraulic pump, new o-rings in the pump and leather backup washer and ring on the piston. I haven"t checked the pressure from the pump, but when the tractor is cold, the lift works perfectly. When it warms up a little it gets weak. Any help would be appreciated.

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Matt Kane

05-20-2007 05:56:26




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 Re: Super 55 Hydraulics Cont. in reply to Matt Kane, 05-18-2007 17:12:44  
The spool valve had alot of wear. There was etching on the surfaces. Also came to the realization that my pump is worn out of specs. So for now its back together with some new seals which helps a little, but when money gets better. I will tear it back down and rebuild the hydraulics. I wish I could just replace the spool valve, but I have no accurate way of checking for internal wear. Also I called maibachs and the valve is discontinued. I heard that too thick of fluid would cause too much pressure in the system.
Its pretty much bad news, but Its nothing to get in there and work on it. Pretty simple now that I have been in there.

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J Schwiebert

05-20-2007 18:31:04




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 Re: Super 55 Hydraulics Cont. in reply to Matt Kane, 05-20-2007 05:56:26  
Did you check the pressure Hot and cold. Remember you have a relief valve that protects against too much pressure with either thick or thin oil. J.



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Matt Kane

05-21-2007 02:24:11




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 Re: Super 55 Hydraulics Cont. in reply to J Schwiebert, 05-20-2007 18:31:04  
I'll have check the pressure. If the pressure varies from cold to hot than it could possibly be a relief valve? Would that be on the internal control valve? I appreciate your help!



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Matt Kane

05-18-2007 17:16:46




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 Re: Super 55 Hydraulics Cont. in reply to Matt Kane, 05-18-2007 17:12:44  
Forgot to add that the 3-point leaks down fast once warmed up. I think its due to the worn valve, or valve bore. I had it together with the new seals and it did the same thing, so i just did the press test.



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J Schwiebert

05-20-2007 04:59:30




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 Re: Super 55 Hydraulics Cont. in reply to Matt Kane, 05-18-2007 17:16:46  
Matt: It has been probably 35 years since I have checked one, BUT the position of that spool is very critical or you will get a false reading.



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