Grapple problems

[used red MN]

I’ve tried to isolate my inputs to one at a time. It’s difficult as old habits die hard (and grappling brush just work better with loader motions at your disposal). Best I can tell, it matters not whether I’m giving a separate input when closing the grapple.



That I don’t know.

Tractordata says open center, Peter the operator of that site claims all his information is from factory publications.
I really feel a picture or two would be helpful here. It is quite simple to do if you have a smart phone. Take the pictures with it. Navigate to YT on you phone’s browser, sign in. Hit reply here and then the “Attach files” button. It will give you an option to choose access the photo storage on your phone, then select the photos and hit post. Or take the pictures and email them to yourself to access them on a computer if you need to go that way.

 

[Nc995]

Tractordata says open center, Peter the operator of that site claims all his information is from factory publications.

Thanks.

 

[Nc995]

I really feel a picture or two would be helpful here.

 

[TerryfromSWIowa]

I think I would lean towards an issue with the electrical. A couple cycles of the hydraulics generally is sufficient to bleed system. Kubota sells Landpride implements with their tractors.

 

[used red MN]

Thanks for the photo! Okay the two halves are tee’d, since there is no mechanical connection between the two halves I am sure you don’t have to operate it long to access the following. The side with the least resistance will travel the longest distance of its stroke when pressure is applied to both. Also when operating it if something places more force on one it would indeed open if the opposite side has less force on it. Are you claiming fittings have been broken off of cylinders during the “violent” cycles in the configuration shown in the photo?

 

[flying belgian]

I don't see why that wouldn't work. Now that I see picture I am really puzzled.

 

[Nc995]

Thanks for the photo! Okay the two halves are tee’d, since there is no mechanical connection between the two halves I am sure you don’t have to operate it long to access the following. The side with the least resistance will travel the longest distance of its stroke when pressure is applied to both. Also when operating it if something places more force on one it would indeed open if the opposite side has less force on it. Are you claiming fittings have been broken off of cylinders during the “violent” cycles in the configuration shown in the photo?

Broke one clear off once and I’ve twice bent one enough to allow the o-ring to blow out and no longer be serviceable.

I don’t get bent out of shape over busted fittings and hoses. It’s going to happen on occasion with grapple work. I do need to grapple to respond in the correct direction to inputs, however. Having it act up even intermittently is major impediment to efficiency.

 

[Nc995]

I don't see why that wouldn't work. Now that I see picture I am really puzzled.

Me too. I had three of this same bucket at one time running on SVL90s and 95s. Operators put them through hell and still I’ve never seen anything like this.

 

[caterpillar guy]

My query would be does it doe it at all portions of the cylinder stroke or just at a certain portion of it? If at just a certain point in the cylinder stroke I would suspect bent shafts in the cylinders letting oil bypas at the bent spot and now the seals ar worn enough to finish the bypassing till it comes to the end of the stroke . Other wise I would consider looking at the elcetrical side of the valve for fryed wires causing sa double connection or some other issue there. Also Could you try disconnecting one side and see if it continues to act up or not if there is a defective flow control of any type in the line some place like an orifice for restriction getting a piece of dirt in the hole part of the time. Just thought on this no better ideas from reading the post and replies.

 

[used red MN]

Me too. I had three of this same bucket at one time running on SVL90s and 95s. Operators put them through hell and still I’ve never seen anything like this.

Me too. I had three of this same bucket at one time running on SVL90s and 95s. Operators put them through hell and still I’ve never seen anything like this.

I want to agree that intermittent cylinder bypass may be the problem, but I am on the fence about it. If one side was clamping a log and the other side had nothing under it that cylinder would be forced to full extension. Both would have equal force against the extend side of the piston. If one of the cylinders bypasses fluid flows over to the retract side. The retract side has less surface area due to the ram taking up surface area. So I just don’t see how the other cylinder could react violently for an entire stroke. I have heard of the internal layer of a hose failing to create a “one way” valve so to speak. If this is your problem it would be difficult to determine where it is.
I have two recommendations for farther diagnosis, one has been mentioned already. If you have multiple machines this will work on switch it onto another machine and see if it works correctly on it. The second would depend on how the loader is plumbed to the tractor. Could you for testing purposes switch the bucket curl to be operated by the added 3rd function and then operate the grapple with the 2nd original remote? Thinking about this in terms of “feathering” for bucket curl, it would probably be better for the main frame to be operated by the third function. However, if the valve is the problem you would not want the loader slamming down with the tractor in motion moving at just about any speed.

 

[Nc995]

The retract side has less surface area due to the ram taking up surface area. So I just don’t see how the other cylinder could react violently for an entire stroke.

This occurred to me also. When opening its retracting…and that’s where the bypass theory falls apart.