LA504 roll back angle improvement?

[LD1]

Keep this simple thing in mine:

In terms of work and power, nothing is free.

You have a given bore and stroke cylinder that yields a given range of travel.

No matter what you do, if you increase the range of travel and keep the cylinder size the same, you will loose force.

IF you increase range of travel by 10%, you will loose 10% force. Just the way it is.

Now I for one do not like the linkages on these smaller loaders. The design now is simple. By going to linkages, you are doubling the number of pivots.

BTW, what is your rollback angle now with the loader sitting on the ground?

 

[CDN Farm Boy]

BTW, what is your rollback angle now with the loader sitting on the ground?

According to my manual I've got 23° rollback and 37° dump measured off horizontal

 

[LD1]

I assume the rollback is at ground line, and the dump is at max height?

If so, and you have plans to do much dumping near max height, I wouldn't want any less than you have now.

 

[CDN Farm Boy]

I assume the rollback is at ground line, and the dump is at max height?

Yes and yes.

I'm looking to gain far more than I'm willing to sacrifice off the 37° dump.

I see lots of Case and JD in the 100hp range that have enough rollback at just above ground that the cutting edge and top edge are nearly level. Need to get a closer look at one of them so I can measure the geometry.

On the up side, last night I was at a buddy's place and he recently picked up a sweet little B7200 that needs a loader. I'm going to try to convince him to let me build him one as prototype for mine

 

[LD1]

So it seems you are after more range of travel. And the only way to do that with existing cylinders is to give up power.

If you cannot accept a loss of power. Bigger cylinders are in order.

 

[CDN Farm Boy]

I guess you are right, it's more range of travel that I'm after. If I were to add a linkage setup with the existing cylinders, would it not be possible to keep the same power with more range? Or even gain a bit of power? With the proper geometry of course

 

[tk tom]

What about the scissor looking links I've seen on some loaders? Does that help angle or curling power? Not sure what that's called, I'll try to find a pic.

 

[tk tom]

Like this

 

[s219]

You can't ever get both things at the same time, linkage or not. Pick one or the other.

 

[CDN Farm Boy]

What about the scissor looking links I've seen on some loaders? Does that help angle or curling power? Not sure what that's called, I'll try to find a pic.

Yup, that's exactly what the linkage is. When set up properly more range of motion is available. The same idea is used on backhoe and excavator buckets to obtain more than 180° of rotation.