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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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S-55 Hydraulic Pump

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Rich

11-02-2003 13:01:35




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I have the hydraulic pump out of the S-55, and I am trying to decide if the center section of the pump needs to be replaced. The inside of the center section has a high polish, but no scoring, the curious thing is the surface has small undulations that I can feel with my finger but can't see by eye.
The end plates are slightly scored and I plan on laping them flat.The reason I pulled the pump was the 3 point was weak and got weaker as the oil got warm.

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Alvin n Ms.

11-05-2003 20:27:09




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 Re: S-55 Hydraulic Pump in reply to Rich, 11-02-2003 13:01:35  
Also, whats it worth, wheres it at, what will you take for it?



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Alvin Wilkinson

11-05-2003 20:21:06




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 Re: S-55 Hydraulic Pump in reply to Rich, 11-02-2003 13:01:35  
I had the same problem about 15 years ago with on a supper 55. I rebuilt the ram cyl, and replaced all the valves. Went through it three times, and the lift still would not work good after it got hot. I never claimed to be a hyd expert, but I decided that was the weaker point about that particular tractor. Did you notice how small the hyd oil reservoir is. The tractor has some outstanding features not found on anything else that I know of, other than the small reservoir. I sold mine to a guy, that has been real happy with it. He never uses it more than a hour a day. In the fall of 1956, the guy that I worked for bought a new one, which I ran pulling a peanut picker. It did a fantastic job, but I left the farm in early 1957, and I know he did not keep it very long before trading it on a MF 35 diesel with 3cyl Perkins. He may have had lift problems, because he normaly kept one for long years. Will someone add on to this please, that used one for serious farm and long long hours.

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J. Schwiebert

11-02-2003 14:04:22




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 Re: S-55 Hydraulic Pump in reply to Rich, 11-02-2003 13:01:35  
You are there and I am in here. Have you checked the relief valve, the seals on the lift cylinder or anything else. There is a procedure to follow in the shop manual that was given on this form maybe two month ago. Did you check the pressure before you disassembled it? What is the serial number of the tractor. Those Super 55 hydraulic systems were changed from the first to the last one. On the early ones a kit was available to increase the oil capacity to prevent some of this heat. Also there are adjustments. Are you running in draft control or position control?

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old

11-02-2003 13:35:41




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 Re: S-55 Hydraulic Pump in reply to Rich, 11-02-2003 13:01:35  
you might try asking Larry at olivertractor.com I'm sure he would have the answer and probably the parts hope this helps you



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