How does this lever work?

[chupacabra]

I don't understand how to set this lever bolt to keep my rotary cutter at the same height every time I lower my cutter. And what is the spring for?

Thanks,

Chupacabra

 

[fxrs55]

That linkage is not to stop the 3 point hitch at a pre set height.
It is to push the lift lever forward to the neutral position so it does
not over load the hydraulic pump when raising the 3 point hitch.
Its all about not overloading the pump. You could use that to
have the 3 point stop from coming up the whole way.
I have mine set to raise up the whole way. You'll notice that
one end is attached to the right lift arm and the other end
is attached to the lift/lower valve handle

 

[wheelbuilder]

That's a different 3 point control than is on my 1502/tx2140. I wonder if that changed when they changed from the 2 cyl. engines. Mine will let you run it up until the pump squeals.

 

[Ilikeurtractor]

The TX21x0 series tractors, to the best of my knowledge, all came with "position control" 3-point hitches. Position control maintains the 3-point arms at a given point set by the control lever. For what the OP is desiring this configuration solves his problem. So even if the 3-point piston leaks by and the arms begin to lower the position control system will detect it and supply high pressure oil to the piston to bring the arms back to the set point. There is no "auto-return" lever feature with the spring and linkage as on the predecessor design to take the control lever out of the "raise" position. You move the lever to where you want the 3-point arms to be at and the lever stays there. One option to get what you want with the former design is adding a (preferably adjustable) mechanical stop for the 3-point arms. A chain comes to mind as an easy/quick possible solution.

 

[chupacabra]

That linkage is not to stop the 3 point hitch at a pre set height.
It is to push the lift lever forward to the neutral position so it does
not over load the hydraulic pump when raising the 3 point hitch.
Its all about not overloading the pump. You could use that to
have the 3 point stop from coming up the whole way.
I have mine set to raise up the whole way. You'll notice that
one end is attached to the right lift arm and the other end
is attached to the lift/lower valve handle

Ok, I went out and tried it and it is just what you said. It stops the arms from raising at whatever you set it out! I played with it a little and set like yours, where the arms go all the way up.

Thanks

 

[chupacabra]

The TX21x0 series tractors, to the best of my knowledge, all came with "position control" 3-point hitches. Position control maintains the 3-point arms at a given point set by the control lever. For what the OP is desiring this configuration solves his problem. So even if the 3-point piston leaks by and the arms begin to lower the position control system will detect it and supply high pressure oil to the piston to bring the arms back to the set point. There is no "auto-return" lever feature with the spring and linkage as on the predecessor design to take the control lever out of the "raise" position. You move the lever to where you want the 3-point arms to be at and the lever stays there. One option to get what you want with the former design is adding a (preferably adjustable) mechanical stop for the 3-point arms. A chain comes to mind as an easy/quick possible solution.

Ok, I understand now, I think. So if I'm using the rotary cutter set at a certain height across the field, the position control will bring the arms back up automatically, if the engine is running? The position control is automatic? And to be able to set a repeatable height for the cutter, chains would be used? Ok, now I have much clearer picture of everything.

Thanks for the information.

 

[Ilikeurtractor]

Yes, position control maintains a set height based on the lever position which is essentially infinite between fully lowered and fully raised. Since you don't have position control, you'll need something to make a given height repeatable like chains holding the arms from going lower while you mow (if your cylinder leaks by and the lever is in the "hold" position) or you lower the arms or place them in the "float" position (fully forward).

I couldn't find any videos on YouTube showing the different types of controls for a 3-point. A lot of them discuss "draft control" which is an additional feature on top of position control but its use is for limited or unique applications. Position control is nice because it gives you finer control over the height of the arms and I've found it to not be as "jerky" as the detent-type (up/hold/float) style. In some cases it does cause the circuit to stay pressurized to the 3-point while it tries to maintain a certain position if it is under heavy load. It also will reset the height of the 3-point if it happens to bleed down when the tractor is off and you start it back up which could create a safety hazard if you have body parts in the 3-point area. This also loads the starter and slows cranking speeds until it achieves its set point.