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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Re: 550 Oliver

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Author  [Modern View]

10-18-2013 09:58:02

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So you have each cylinder plumbed separately. Each has its own lever. You have a loader moving up so you are putting more fluid into the cylinders to move them. Somewhere you are building pressure.
I'll let the experts chime in but I bet it will involve a pressue guage.

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Wayne Six

10-18-2013 12:40:51

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 Re: 550 Oliver in reply to wmthrower, 10-18-2013 09:58:02  
Looks like picture did not make it..trying again...

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J. Schwiebert

10-20-2013 05:15:23

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 Re: 550 Oliver in reply to Wayne Six, 10-18-2013 12:40:51  
That valve looks likea Gresen model 300. Notice the pipe plug above the valves spool. If so, the rear port needs to be plugged. A model 300 is only made to run a single acting cylinder. The spool is machined on one end along with the internal passage blocked by that plug to allow the flow to go to tank. There is also a plastic check ball that goes in there but it probably has been close to 15 years since I looked at one. Look real hard for some casting numbers or letters. I am out of town and can look in my Gresen parts list when I get back home. J.

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Wayne Six

10-27-2013 09:04:05

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 Re: 550 Oliver in reply to J. Schwiebert, 10-20-2013 05:15:23  
Got to work on tractor yesterday....and you were very close. After removing about a half inch of paint, the valve says GRESEN 550 and in smaller font 8/12/68.
Pulled both hoses off the cylinders and put in a bucket so could watch them side by side. When I pulled on lever it looked like an identical amount of fluid came out of both hoses..when I pushed on the lever, the hose connected to the port closest to the lever actually had a small amount of oil come out of it at a slight pressure; nothing came out of the port furthest from the lever. Put the hoses to a T on the port closest to the lever...loader went up fine, but would not go down..actually kept creeping up a bit. 300 pound son could stop and get it to come down real slow. Putting T on port furthest from the lever, loader again went up fine, but would not go down...didn't creep though and son was able to easily make it go down. With the T in either port, the loader went down nice as you please with the tractor shut off... So, looks to me like controller is unique to this loader/tractor and is shot, I now know more about hydraulics than I ever thought I would at this point in my life. I know what a replacement controller would cost and a friend and I are going to take the controller to a place in Richmond tommorrow and see what it will cost to rebuild this one...would love to keep this thing stock, but am not a purist when it comes to too much money. Thanks to all for the help, suggestions, and recommendations.

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10-18-2013 12:46:28

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 Re: 550 Oliver in reply to Wayne Six, 10-18-2013 12:40:51  
Wait a minute. If you read what I wrote before I edited it,don't pay any attention. I looked at the picture again,that was all wrong. I honestly don't see how that ever worked. And you say it did though?
What's happening there is that if you have single acting cylinders (no down pressure,one hose to each cylinder and only at the bottom),when you raise it,you're putting pressure to one cylinder,then when you try to let it down,you're putting pressure to the other.

You need to put a pipe plug in the top port closest to you and a pipe T in the other and plumb it so both cylinders are getting oil from the same port. Hook both hoses to the T. You don't need a return to the valve,when you push the lever it will let the oil from the cylinders back in through the valve.
This post was edited by rrlund at 12:54:32 10/18/13.

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Wayne Six

10-18-2013 12:36:07

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 Re: 550 Oliver in reply to wmthrower, 10-18-2013 09:58:02  
Hopefully these pictures will explain what I am dealing with...the only markings on the controller are IN and OUT. The lines attached to the two lower fittings lead back to the tractor and appear to be 1/2" or 5/8" fittings. There are two 3/8" hoses coming out of the top of the controller and each runs directly to a cylinder on the loader arms. Pushing the single lever lifts the bucket. Pulling on the lever used to release pressure and bucket went down. Now it will not go down unless you turn the tractor off...suspect maybe leaking O rings or something, but would sure help if I had some diagram/schematic of the controller before I tear it apart as have never seen a setup like this before. Please see close up picture of controller, might help explain what I have.

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10-18-2013 12:41:16

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 Re: 550 Oliver in reply to Wayne Six, 10-18-2013 12:36:07  
No picture.

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