Grapple Grapple Hydraulics Questions (pics)

[jc7622]

I posted a question a while back about the hydraulics on my new grapple. Attached are the pics that everyone requested.

The grapple is plumbed into the rear remotes (pic 003). The grapple came with the hoses already installed from the 'T' to the cylinders. I installed the hoses coming up out of the top of the 'T' that couple into the hoses that plug into the rear remotes.

The problem is that when I open the grapple and then let off the handle the claws seem to loose their pressure and slowly close instead of staying in place. Actually the grapple claws just flop around when I let off the handle instead of staying where I ant them. I borrowed another grapple once before I bought this one and didn't have this problem. I could open the grapple claws fully (or however much open I wanted them) and they would stay there in that position until I opened or closed them.

Any idea what my problem is?

Thanks,

JC

 

[bjcsc]

A couple of things to check: 1) Your remotes: Some are single acting and double acting but require you to choose which and 2) Make sure the ends on your hyd. hoses are compatible with whatever is inside your remotes.

The plumbing on the grapple is correct. An interesting experiment would be to reverse the connections at the remotes and see what changes, if any, occur...

 

[KAB]

I can't tell by looking but is there a flow restrictor installed on the grapple cylinders? (piston end) The first flow restrictor that I used when I made my grapple caused the same problem that you describe. I moved the restrictor to the other end of the cylinder and the problem moved to the location on the restrictor. I then bought a restrictor from TSC, which has a larger nozzle size, and it fixed the problem.

Kurt

 

[Wall]

If one of the cylinders leaks internally it would cause that sort of problem.

 

[kennyd]

I agree with Wall...
My money is on one (or both) of the cylinders is leaking internally.

 

[bjcsc]

As I posted in his original post, both would have to leak to cause the problem, The likelihood of both cylinders being defective is slim...

 

[kennyd]

As I posted in his original post, both would have to leak to cause the problem, The likelihood of both cylinders being defective is slim...

I missed your other post..

But since the cylinders are hooked in parallel to each other, just one leaking internally (fluid bypassing the piston seal) would cause this condition.

Can you please explain why you think both would have to be leaking for this condition to happen?

 

[dtd24]

un-related to your problem, but does your 3pt arms raise and lower with your grapple hooked up. It is my understanding that it wouldn't.

 

[bjcsc]

Can you please explain why you think both would have to be leaking for this condition to happen?

I can't...I'm wrong about that. I wasn't thinking correctly about the parallel connection. You're right, and I would also now agree with you that it would most likely be one cylinder leaking. Sorry for the confusion...

 

[kennyd]

un-related to your problem, but does your 3pt arms raise and lower with your grapple hooked up. It is my understanding that it wouldn't.

His grapple is hooked up to a rear remote, totally unrelated the the 3PH. Why do you think the 3PH wouldn't work?