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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Super 88 Hydraulic Pump

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Nate88

11-21-2007 06:18:40




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I have removed my Super 88 hydraulic pump for a rebuild. Ever since I bought the tractor it would not lift a heavy load, and appears oil is leaking from the hydraulics into the rear end. I have not yet opened up the pump, but looks like one seal is not installed correctly, which could be why I am losing hydraulic oil. What other things should I be looking for when I rebuild this pump? I hear a lot about cracked center plates, but from quick external inspection, doesn't appear to be cracked. On the one side of the pump there appears to be an adjustment screw. Is this a relief or bypass valve for the pump? Any help for rebuilding the pump and checking the hydraulics for proper operation would be appreciated. Thanks.

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Nate88

11-21-2007 14:16:04




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 Re: Super 88 Hydraulic Pump in reply to Nate88, 11-21-2007 06:18:40  
Took the pump apart and overall looks really good. The center plate is not cracked or damaged, and there is no sign of debris damage. One of the seals was missing and the other on that side was misaligned, so that is probably where I was losing hydraulic fluid. I'm going to install 4 new seals and new orings around the pump inlet and outlet. The needle bearings all look good and the shafts look good too. Next step will be to check the pressure relief valve in the base and run a pressure test. I did manage to find my service manual which explains a lot things. Thanks for the help.

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old

11-21-2007 08:49:07




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 Re: Super 88 Hydraulic Pump in reply to Nate88, 11-21-2007 06:18:40  
As far as hyd oil in the rear end yep common problem when the seals go bad. I replace the seals in my S88 a couple years ago and have not had that problem since. I also think but can not be sure but the hyds seem to work better now



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rrlund

11-21-2007 07:13:37




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 Re: Super 88 Hydraulic Pump in reply to Nate88, 11-21-2007 06:18:40  
I THINK the Oliver Gang sells a video on rebuilding those. Might be a handy item to have. www.olivergang.org



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ollie770

11-21-2007 06:29:52




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 Re: Super 88 Hydraulic Pump in reply to Nate88, 11-21-2007 06:18:40  
Some of the experts will probably add in but usually with the hydraulic pumps, you want to completely disassemble. Once there, usually need to install new needle bearings. Inspect the centerplate for cracks - this is important. From there, inspect the gears, shafts, and surfaces of the pump housing where they face up with the centerplate. If everything looks good, reassemble the pump and install the pump seals - I have been told to install them both the same direction. Good luck!

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