3pth arms stay up

550Doug · Jun 15, 2009

Even with the tractor turned off, the arms stay up. I've taken apart the servo valve but found no crud. Could this be related to the saftey relief valve? or maybe the control valve?
Any ideas are welcome
Thanks

ps tractor is a 1961 Cockshutt 540

keh · Jun 15, 2009

Is that Cockshutt the same as an Oliver 550? Anyway, do the arms go down when you lower the lift lever? If so it's doing what it's supposed to and has good o rings in the lift cylinder. If it does not go down with the lever down, does it go down when you apply weight to it? If so, it still just has good o rings. If it won't go down with weight, there must be some sort of blockage it the hydraulic plumbing and I don't know what it could be.

KEH

550Doug · Jun 15, 2009

This is NOT the Oliver 550 tractor.
I have emptied the whole system and cylinder of old fluid and reassembled with the arms down. I put in new fluid and started the tractor with the lever in DOWN position. When the tractor started, the arms immediately raised to the top and stayed there after motor was turned off.
I agree about your point on a blockage, but where? In the return line to the pump? Could a bad control valve be the culprit? Or the saftey relief valve?

keh · Jun 15, 2009

I was just curious about it being like an Oliver, my remarks about problem applied to tractors in general.

Back to the problem: Some tractors have a spring that keeps the lever in the proper position. If this spring is broken it may lift the arms, I had that happen on a much later model
Long. I don't know how that system is on your tractor. Maybe this is called the detent spring?
You said you took apart the valve, maybe the spring was already broken and you didn't notice it.
I can't see the relief valve causing the problem, but I'm no expert. If you could see a parts breakdown it might help.

Hope this helps.

KEH

Anonymous-0 · Jun 15, 2009

How can I contact you? It will be Wednesday or Thursday since they are talking rain. I have a couple of questions for you. J.

Dan-IA · Jun 15, 2009

I talked to a dealer about how they make the 3pt arms stick up a couple years ago.

Turns out most tractors have 'em leak down, so to make it look good they lower 'em all the way, then unscrew the side bolts and pull the arms off the spline shaft. Then they stick 'em back on so they look like they're fully raised.

Dealer said it brings more people in.

No telling whether they do something to disable the lever or bypass the hydraulics to avoid bending fenders or cabs or something.

I suspect that you may have a similar issue.

johninutah · Jun 15, 2009

Go to the Oliver Heritage magazine website. There is a guy named Larry Harsin that you can e-mail who appears to have a lot of knowledge especially about Olivers but would know about cockshutt if they are similar.

Traditional Farmer · Jun 16, 2009

There is an adjustment for the depth control that can be pretty tricky on the 550.Its been a few years but think I ended up making a piece to give it more adjustment

3pth arms stay up

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