Front End Loader Leveling Arms?

[SPYDERLK]

Can you elaborate on how this "lock up" can occur, I can't understand given all you are really doing is moving the rear anchor points for the curl cylinders as the loader raises?

Cheers

Rohan

Its because the bucket can only curl so far. Say you have it up a few feet, curl it all the way and lower it - or dumped all the way and raise it. What happens? Also lesser issue problems when encountering more than curl force capability at the bucket lip when raising.
larry

 

[Renze]

The flow diverter valve... Our hydraulic self-level feature is tops in the industry, bar none.

Could be, but flow diverter hydraulic self leveling still doesnt get near reaction cylinder hydraulic self levelling, or mechanical self levelling.

 

[rhamer]

Its because the bucket can only curl so far. Say you have it up a few feet, curl it all the way and lower it - or dumped all the way and raise it. What happens? Also lesser issue problems when encountering more than curl force capability at the bucket lip when raising.
larry

Ah, yes I hadn't thought about that.

How is this problem avoided with commercial mechanical leveling systems?

I assume the bucket must be able to curl in each direction further than the hydraulics can push it.

So bucket curl in both directions = hydraulic curl + mechanical curl

Cheers

Rohan

 

[SPYDERLK]

Ah, yes I hadn't thought about that.

How is this problem avoided with commercial mechanical leveling systems?

I assume the bucket must be able to curl in each direction further than the hydraulics can push it.

So bucket curl in both directions = hydraulic curl + mechanical curl

Cheers

Rohan

I think bucket stops are placed on the loader arms to stop before the cylinder uses all its travel. With a msl you may find lift points that allow full cylinder travel then move the arms to hit the curl stop and force cyl movement. Thats why you can get in trouble in the situations I mentioned if you dont have a relief valve in the curl circuit as I think rback33 was saying. With the curl spool centered there is no relief for the curl cyls if the bucket hits its stop as you raise or lower the arms.
larry

 

[rhamer]

I think bucket stops are placed on the loader arms to stop before the cylinder uses all its travel. With a msl you may find lift points that allow full cylinder travel then move the arms to hit the curl stop and force cyl movement. Thats why you can get in trouble in the situations I mentioned if you dont have a relief valve in the curl circuit as I think rback33 was saying. With the curl spool centered there is no relief for the curl cyls if the bucket hits its stop as you raise or lower the arms.
larry

So the trick is to make sure the cylinders reach the end of their travel (in both directions) before the bucket reaches the full extent of it's rotation (in both directions)

Cheers

Rohan

 

[Reg]

Search for threads on Kioti KL451 (& above) loader.

 

[rhamer]

Search for threads on Kioti KL451 (& above) loader.

Thanks Reg, but I'm not exactly sure what I'm searching for?

I found a whole lot of stuff on cracked Kioti loaders, but they seemed to be ones without leveling arms.

Cheers

Rohan

 

[R W]

So the trick is to make sure the cylinders reach the end of their travel (in both directions) before the bucket reaches the full extent of it's rotation (in both directions)

Cheers

Rohan

I agree, and would think many factory built units would be set up this way.
Hope to check them out at the National Field Days (Orange NSW) this month.

 

[rback33]

In the system the relief dumps the fluid from the from the tilt circuit back to the lift circuit so the the cylinders either extend or retract accordingly. With out the relief in the system, everything locks up. The linkages and cylinders continue be pushed as the lift cylinders continue to move. Something has to give at some point. When something gives... it's scary. I have seen one practically explode due to a malfunctioning relief.

 

[Reg]

In the system the relief dumps the fluid from the from the tilt circuit back to the lift circuit so the the cylinders either extend or retract accordingly. With out the relief in the system, everything locks up. The linkages and cylinders continue be pushed as the lift cylinders continue to move. Something has to give at some point. When something gives... it's scary. I have seen one practically explode due to a malfunctioning relief.

No need.
Just do the geometry right and the cylinders don't "fight each other".
Kioti KL451 and similar are examples of this.
If Kioti dealers aren't plentiful in your area take a look at a John Deere CX400 loader, which I just happened to see at a horse show today.
Now THAT is an easy one to understand, without even seeing it go up and down (-:
Heck, their brochure probably shows it and even a picture should be enough.