Grapple Grapple Hydraulic Question

[jc7622]

I bought a new grapple from Vassar Mfg in Perkins, OK. I got it all hooked up but am having a problem with it. The upper claws will not stay in place when I let off the valve. When I open the claws fully and then let off the handle they lose pressure and fall back down. The same is true for the opposite. I have borrowed another grapple and used it on this same tractor and didn't have this problem. I plumbed the hoses to the 'T' on the grapple. Is there some kind of a part or backflow or something that I should have also installed in the line? I topped off the hydraulic fluid after getting it fired up for the first time so I don't think that is the problem.

Thanks

JC

 

[3RRL]

A "T" you say? Are there two hydraulic cylinders on that model or just one?
Any pictures?

 

[bjcsc]

My grapple is plumbed similarly. Backflow valve would make it inoperable. Either your valve is not functioning correctly of the cylinders are leaking. The former is more likely...

 

[RonMar]

Pics would be good. Like Rob, I hear the word "T" and I think dual cylinders or an alternate flow path...

 

[kennyd]

JC, we definitely need more info to help you:

What tractor do you have?
Are you operating the grapple through a rear remote, or a electric valve or diverter on the FEL?
Any chance of a picture so we can see how its plumbed?
Are the two grapple cylinders in series with each other or parallel?

 

[jc7622]

I'll take some pictures and post them with more info.

JC