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I was going to follow Dan's steps which makes common sense. Before proceeding, I took a mirror & a light & found a second valve adjustment screw underneath the valve. I removed cover, loosened & moved two 90* fitting lines just to get to the nut (still very tight) & screw. I used an extra...

I've educate myself to the fullest I can with everything I do. The Kubota OEM thumb kit is BT4598 (no pdf) for the L45TLB. According to the dealer, this kit is out sourced (NOT made by Kubota). They have one shitty picture of this kit that I found which is the same as the dealer pulled up...

Good question. Backhoe works great. There's a separate valve with foot pedal just for the thumb which I'm sure you know. My original post mentioned about removing the valve adjustment screw & add a shim (s). Yes, no, I'm at a loss. I don't mine getting a gauge & fittings, but like you...

Thanks for the reply Dan. I tested the cylinder/piston today & it tested good. I re-connected the hose & ran the tractor at 1500 rpm. During the clamping of the thumb, I could still stop it anywhere including pulling it up at end of stroke. I'm not that strong. I wish I could get it to...

I would guess it's JIC also. I took it apart & tried 1/2" American, close but it's not American. To the dealer tomorrow to get answers.

I went to a Kubota dealer to pick up a threaded plug for the hydraulic thumb cylinder along with a threaded cap for the hose. They pulled up the diagram & it doesn't show type or size. They had no tractors with hydraulic thumb on the lot. I called another dealer & they said the same thing...

Thanks, I'll take your advise once I test the cylinder. Do you know a way to test the relief valve? If the cylinder test good & the pressure gauge then drops, I'm assuming it would have to be the relief valve?

That makes a lot of sense about leaking internally. I'll test the dual action cylinder. If defective, I'll order a seal kit. Thank you.

Thanks for the reply. I know I should test the pressure with a gauge. I'm sure I would get an extremely low reading. I'm not even in the ball park of around 2000 psi if I can manual lift the thumb. I know about the bucket curl as I stated. I have no leaks which doesn't matter in my...

I have a L45 TLB with a hydraulic thumb. The thumb moves end of stroke to end of stroke with the foot pedal. The problem I'm having is the thumb has little pressure for holding a rock or log. I loosened the top nut on the valve & turned the adjustment screw clockwise a 1/2 turn (holding the...