Constant rotation valve schematic

[Tom Dunlap]

I'd like to understand how a rotator works like on a skidded grapple or under the seat of a grapple loader. It's a mystery how a valve can be configured to work like that.



Does anyone know of a source of diagrams so that I can figure out what it looks like inside a rotator?

 

[classictruckman]

hope this gives you an idea, i've looked at a hundred cutaways, but can't find any now.

 

[craneguy1]

In thinking they would be pretty much the same as a swing cab boom truck....i guess i'm way off. Thought it would be more one in and one out.

 

[classictruckman]

http://hydraulicspneumatics.com/200...n/Article/False/6421/TechZone-FittingsCouplin

There's a good diagram about halfway down the page.

 

[Tom Dunlap]

Thanks! I think I understand the mechanics now. Next week when I'm around one of the grapple trucks I'm going to look at the grapple and study the hydraulic lines. Then I should be able to see how it works.

 

[TreeLogic]

Thanks! I think I understand the mechanics now. Next week when I'm around one of the grapple trucks I'm going to look at the grapple and study the hydraulic lines. Then I should be able to see how it works.

Just don't go taking the valve apart, Tom. That grapple might be down for weeks

classictruckman,
I've always wondered about your avatar. That's a cool pic! Is the piece on the right being craned out? And is it fused to that other trunk, or is that just optical illusion?

 

[classictruckman]

I'm standing in a crotch after making a cut, that tree and the one in the backround were both crane trees done for the local utility company.

 

[TreeLogic]

I'm standing in a crotch after making a cut, that tree and the one in the backround were both crane trees done for the local utility company.

I think I see what's going on now. The piece being lifted looks like it's attached to the other leader at the bottom right, but it's not. Optical illusion. Good pic... and pick