dfkrug
Super Member
- Joined
- Feb 3, 2004
- Messages
- 7,585
- Location
- Santa Cruz Mtns, CA
- Tractor
- 05 Kioti CK30HST w/ Prairie Dog backhoe, XN08 mini-X
I'm still a little worried about the 3/4" pins given the forces involved.
You should be. Somewhere in this thread, I posted about this issue when I talked
about converting from mechanical to hydraulic.
On a couple of my mechanical thumbs, I bent the 3/4" pins I used. Of course, my
Deeres and Kiotis ran at 2500psi, while my Kubs were down at 2000. I think your
B is also limited to 2000psi. Check that. 1" pins should be used, IMO.
To belabor another point I made, converting an existing mechanical thumb will
force you into getting exactly the correct hydraulic cylinder stroke and length. This
is cuz your pivot point on the thumb is already fixed. I suggest you use mockups
of your cylinder to get the length and stroke just right. Even a 1/2" off and your
rest position against the dipper will be sub-optimal.