Hydraulic problem

caterpillar guy · Jun 21, 2016

I am having problems with the booms not lifting. Now it is an old electric over hydraulic deal. When it went south we just plumbed them in to the tractor hydraulics. This has worked for a few years now very well. Today the booms worked to open up and started to spray. Stopped for a tree and now they will not lift or fold. I can lift them by hand and swing them with the valve. With a gage I got 1500 PSI at the couplers on both sides of both couplers. Now this afternoon I went down again to try after I had checked this out, and added a couple gallon of oil. It was not low, but not quite full either. So it is now about a couple of gallon over full not concerned with that. This afternoon all seemed good went to the field and same thing happened. This time I put a gage on the cylinder line, and got on the lift cylinder 500PSI on the swing 800PSI. I am guessing there is something in the system after the tractor causing the problem. The sprayer is hooked to an 806 IH I sprayed 40 acres yesterday worked fine.

RBoots · Jun 21, 2016

Did you power check the cylinder? If it was leaking by internally, I'd think it would show about what you're reading

rrlund · Jun 21, 2016

Is there one of those hex shaped restrictors in the line somewhere? One of those that has a little pin through it?
I rented a 28% applicator one time,was the first to use it that year. I got it home and couldn't unfold it. Unibomber came out from the fertilizer plant,we got to fooling with everything we knew how. Took that restrictor out and it worked. It went down faster than it probably should have,but it went down.

caterpillar guy · Jun 21, 2016

If I pull up the tension then raise the main boom vertical cylinder it will lift the booms together. Then if you try to lift them more they will sag back to the stops for transport.
No there is not a hex restrictor in the line. At least I have not seen one. The booms move to fast for one.
The pressure was on the line before the cylinder not after the cylinder. So that should clear the cylinder.
I have been wondering if the valves could be leaking by that much.

Steve@Advance · Jun 21, 2016

That's what I'm thinking, cylinder leaking internally. Works better cold when the oil is thicker.

RBoots · Jun 21, 2016

Not trying to second guess you Caterpillar guy, but, if you had torched seals in the cylinder, there wouldn't/shouldn't be enough resistance to build pressure to measure properly, even before the cylinder. If you really wanted to be sure, cap the line to the cylinder and screw your gauge into that cap, that would tell you exactly how much you are getting from the valve, without any loss from the cylinder if there is any. You won't hurt anything, it'll go over relief. Then again, maybe you have a piece of trash stuck in the relief valve, I have seen that quite a few times. A piece of O ring or something sticking it open, will never build much pressure, just dumps most of it off.

Hydraulic problem

caterpillar guy

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RBoots

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rrlund

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caterpillar guy

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Steve@Advance

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RBoots

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