3-Point Hitch Bent Telescopic Stabilizer using box blade

[SPYDERLK]

Be lucky the brake housing where the three point arms attach did not break. Somebody did that pushing a load of logs with a box scraper.

David

That sounds like a failure secondary to a sway or lift link problem -- allowing the lift link to pry on the housing.

 

[SPYDERLK]

I disagree with some of the adjustment methods here. I cannot see how a pair of rigid stabilizer links can both be set so that both sides will be in tension rather than compression. It looks to me that when the implement is loaded from the side, the stabilizer link on that side will be in tension and if the other side will either be too loose or in compression....probably too loose so that the second side isn't in compression. But if that is so, what happens when the load is shifted to the other side? Then that first stabilizer bar has to be in serious compression.

I suppose one could very carefully set both stabilizers up for nearly zero side play of the implement. Then the inevitable compressive loads on a side wouldn't be enough to fail that stabilizer before the tension ability of the other side came into play.

The solution would seem to be to use sway-reducing chains instead of rigid bars.
luck, rScotty

Both sides, either in tension or compression are fighting each other. IOT not fight you must allow a little side sway. Depending on which side of the lift arm the telescopic sway links act on will determine the strategy.
... If, as on my 7520, they act on the outside, for tension you would set the arms a little wide so that the linch pin on one implement pin would come into play before the other lift arm hit the shoulder on the other implement pin.
... If, as on a BX, they act on the inside, for tension you would set the arms a little narrow so that the shoulders come into play alternately as the implement sways. The linch pins are never loaded in this case.
,,,larry

 

[bcp]

Does the BX have it's sway link pivots coincident with the lower arm pivots? IF so, then there are no tight or loose spots in the lift motion.

Sorta-kinda coincident. Photo below borrowed from another thread.



Hitch modification thread photo came from.
http://www.tractorbynet.com/forums/kubota-owning-operating/243273-bx25-3pt-modifications-2.html

Bruce

 

[Porchfan]

When you have a tractor with a heavy implement that is digging deep in the soil like a box blade or a plow and moving forward, both telescopic or turnbuckle type stabilizers are in tension. One may have more than the other but both are going to be in tension 99% or more of the time. If the stabilizer are very ridged like a telescopic stabilizer with very little sway, one could get into compression periodically. However, that is not what happen to my tractor.

I believe I had some slack in the stabilizers. As a result there is no way they bent when I was moving forward. I know I moved backward very hard several times with the rippers and blade way down. I also tried to lift the hitch several times when I was stuck temporarily on that big root. It could be that I bent the stabilizer while lifting the implement. The tractor can lift quite a bit. Also, the stabilizer was bent downward and not upward. If it was upward, the lifting action on a stuck root would not have been the cause.

The bottom line in all this is telescopic stabilizers are fine if you run your tractor properly. I should never had moved hard backwards with the blade and rippers down. I also should have been more careful lifting the hitch while it was stuck.

 

[ovrszd]

The bottom line in all this is telescopic stabilizers are fine if you run your tractor properly. I should never had moved hard backwards with the blade and rippers down. I also should have been more careful lifting the hitch while it was stuck.

I would add, telescoping stabilizers are fine it they are pinned properly.

I do a LOT of wok backwards with my BB. If the stabilizers are properly pinned they will also take load off the 3pt arms.

In my case my rippers are hydraulic controlled and I would NEVER push backward with them lowered. So that might add some load to the operation. But if the stabilizers were properly pinned no damage should occur.

When using a BB I pin as tight as I can, allowing no side slop.

 

[CalG]

When you have a tractor with a heavy implement that is digging deep in the soil like a box blade or a plow and moving forward, both telescopic or turnbuckle type stabilizers are in tension. One may have more than the other but both are going to be in tension 99% or more of the time. If the stabilizer are very ridged like a telescopic stabilizer with very little sway, one could get into compression periodically. However, that is not what happen to my tractor.

I believe I had some slack in the stabilizers. As a result there is no way they bent when I was moving forward. I know I moved backward very hard several times with the rippers and blade way down. I also tried to lift the hitch several times when I was stuck temporarily on that big root. It could be that I bent the stabilizer while lifting the implement. The tractor can lift quite a bit. Also, the stabilizer was bent downward and not upward. If it was upward, the lifting action on a stuck root would not have been the cause.

The bottom line in all this is telescopic stabilizers are fine if you run your tractor properly. I should never had moved hard backwards with the blade and rippers down. I also should have been more careful lifting the hitch while it was stuck.

You are missing something, or the photos you attached in the OP do not display the full story.

The sway bar is bent. That means that it was subject to compression i.e. was forced to become "shorter". Sway arms should never see any of the loads that the lower links see, such as tension or compression. They only come to play when the lower arms are pushed or pulled SIDE WAYS. Pulling a deeply engaged attachment with no side loads would mean the sway links would experience NO loading.

In Tension, the sway links will rupture cleanly at failure. In compression, they will bend. Simple as that!

I urge you to look and observe . Simple adjustment is all it takes. Using the 3ph in reverse is not the end of the world. Just set up appropriately!

 

[ovrszd]

Using the 3ph in reverse is not the end of the world. Just set up appropriately!

True that!!!

 

[rScotty]

You are missing something, or the photos you attached in the OP do not display the full story.

The sway bar is bent. That means that it was subject to compression i.e. was forced to become "shorter". Sway arms should never see any of the loads that the lower links see, such as tension or compression. They only come to play when the lower arms are pushed or pulled SIDE WAYS. Pulling a deeply engaged attachment with no side loads would mean the sway links would experience NO loading.

In Tension, the sway links will rupture cleanly at failure. In compression, they will bend. Simple as that!

I urge you to look and observe . Simple adjustment is all it takes. Using the 3ph in reverse is not the end of the world. Just set up appropriately!

That's how I see it too. It makes no difference if the implement is being pulled or pushed, if there's no side loads there isn't any load on the sway links. Zero. Of course that's zero in theory rather than practice.....and only true with the perfect tractor running in a perfectly straight line in soil that never varies.

In practice, turning ever so slightly, a difference in traction or slope, uneven soil, a few rocks and the occasional buried stump are all out there just waiting to throw some mean side loads against our implements.

As CalG says, "....look and observe" - can't do better than that.

What I'm taking away from this thread is there's a benefit to designing an inexpensive part that will bend rather than break.....and in bending will also protect something else more expensive. Sorta like a fuse, but even better because this fuse can be bent back straight again.
That's clever.
luck, rScotty

 

[SPYDERLK]

What I'm taking away from this thread is there's a benefit to designing an inexpensive part that will bend rather than break.....and in bending will also protect something else more expensive. Sorta like a fuse, but even better because this fuse can be bent back straight again.
That's clever.
luck, rScotty

Nope. ... Just a part that is not strong enuf to use in compression - a design error that is as likely to endanger other components.

 

[CalG]

Nope.. just a part that failed in compression because the part that was supposed to carry the load in tension was not adjusted to do so.