NikonRon
New member
How can I increase thumb holding power? Ron
Kx121-3ss thumb power
- Thread starter NikonRon
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dfkrug
Super Member
- Joined
- Feb 3, 2004
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- 7,602
- Location
- Santa Cruz Mtns, CA
- Tractor
- 05 Kioti CK30HST w/ Prairie Dog backhoe, XN08 mini-X
If you can locate the AUX valve that controls the thumb, it may have its own
relief valve. Sometimes they are adjustable. If you have an OEM setup, your
manual may have a hyd schematic.
If you want to mess around with relief valve settings, I suggest you get a
pressure test gauge, if you do not have one.
relief valve. Sometimes they are adjustable. If you have an OEM setup, your
manual may have a hyd schematic.
If you want to mess around with relief valve settings, I suggest you get a
pressure test gauge, if you do not have one.
Assuming a cylinder is operating to its full system ability, but is weak, in general, you can go up a size in cylinder diameter, or move the thumb cylinder pin farther from the hinge pin. But the second option would change the thumb swing arc some.
Does yours look like this?
Bruce
Does yours look like this?
Bruce
Code54
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- Aug 20, 2005
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- Putnam Co. West Virginia
- Tractor
- Kubota MX5100, Kubota BX25D,1957 Farmall Cub Lo-Boy Kubota KX91-3, BCS 853
Just for reference I have a KX91 and if I clamp down with the thumb then let off it continues to hold and does no back off. Sounds like something is leaking down more than you are not getting enough initial pressure. The thumb needs to be set so the bucket can overpower it so the machine does not get damaged.
Code54
Elite Member
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- Aug 20, 2005
- Messages
- 4,308
- Location
- Putnam Co. West Virginia
- Tractor
- Kubota MX5100, Kubota BX25D,1957 Farmall Cub Lo-Boy Kubota KX91-3, BCS 853
Before adjusting pressure you need to check the pressure and see if it is in spec. From what you are saying it does not sound like pressure is your problem, but bleed down is the issue.
Open your cover over the hydro tank - there should be a lever (valve) there on the tank or close to it. This controls the thumb in your case - if it get a little out of position the thumb will bleed off pressure. You normally use this lever to switch between a thumb and a breaker. Check that and see if it helps.
Open your cover over the hydro tank - there should be a lever (valve) there on the tank or close to it. This controls the thumb in your case - if it get a little out of position the thumb will bleed off pressure. You normally use this lever to switch between a thumb and a breaker. Check that and see if it helps.
