Loader Loader boom pin or cylinder: which broke first

[aczlan]

I just went out to the tractor garage to look at my Kubota. It has a SSQA with a 1.25" rod welded as you say, where the OP's is. But then 14 inches back is a 3" cross tube, with a 1/4" wall, welded through the loader arms as well. If one quick attach came loose, I'm thinking it'd take one heck of a load differential to torque bend both those tubes.

s219 is referring to the 1.25" rod on the SSQA getting twisted because one side comes loose, it has happened on here a few times (here is one: http://www.tractorbynet.com/forums/owning-operating/195968-everybody-loves-guessing-game.html)

Aaron Z

 

[beenthere]

JCByrd is right on. Just replace the pin in the hole shown in your pic. I've had to replace mine several times, as an imbalanced load will pop them out. It is like a shear pin... 3/8" bolt I believe, or maybe 1/4".

Nothing wrong with either of the cylinders.

 

[bumperm]

s219 is referring to the 1.25" rod on the SSQA getting twisted because one side comes loose, it has happened on here a few times (here is one: http://www.tractorbynet.com/forums/owning-operating/195968-everybody-loves-guessing-game.html)

Aaron Z

Ouch!

I tried to edit my post, but I guess the original went out. For some inexplicable reason I was first thinking the big 3" tube should prevent that, but then realized that the smaller anti-torque tube in question, between the two pivoting QA brackets, are not reinforced by the larger tube between the loader arms.

 

[s219]

I just went out to the tractor garage to look at my Kubota. It has a SSQA with a 1.25" rod welded as you say, where the OP's is. But then 14 inches back is a 3" cross tube, with a 1/4" wall, welded through the loader arms as well. If one quick attach came loose, I'm thinking it'd take one heck of a load differential to torque bend both those tubes.

The large tube goes across the loader arms, and won't be affected by curl. The skinny one goes between the two sides of the quick attach, so a curling motion with some "difference" will bend it. The scenario I see over and over here on TBN is that the QA comes loose on one side and then some curl motion is applied that twists the cross rod. Here are some good examples:

http://www.tractorbynet.com/forums/.../189712-bent-quick-attach.html?highlight=bent

http://www.tractorbynet.com/forums/...4063-kubota-quick-attach-loader-problems.html

http://www.tractorbynet.com/forums/...ne-side-after.html?highlight=bent#post3874812

http://www.tractorbynet.com/forums/kubota-owning-operating/265676-problem-two-month-old-la.html

http://www.tractorbynet.com/forums/parts-repairs/314969-kubota-l3800-loader-problems-twisted.html

I don't have a QA setup, but when I get one I plan to put safety cables or some other fix to make sure the dang things can't come loose. As common as it gets reported here, it's a sure bet I'd stumble into this problem!

 

[SSdoxie]

Oil under pressure flows to path of least riesistance. The cylinder that moves faster has less friction in the pivot pins to overcome so moves easier, when that reaches end of stroke the other cylinder will move and catch up then put the new shear pin in.

 

[BrookW]

Looks like the consensus opinion is to simply replace the sheer pin (referred to by JD as the pin fastener), grease it, and get back to work.

I'm glad that the JD QA system has these sheer pins so I don't have to monkey with twisted components when the loader is maxed out with an unbalanced load as highlighted by some of the posts listed by s219. No offense meant to other designs, I'm just tickled that this fix will take less than a minute and cost a dime.

 

[Zebrafive]

I too, vote the shear pin broke first, I too doubt the curl cylinder is broken.

 

[BrookW]

Replaced the sheer pin. Greased the loader. Filled a sinkhole with wet sand. Everything seems to be working. The left JD QA "holder" (paddle, ear...) is still slower to respond than the right which wasn't the case until recently. Not going to fret unless instructed to do so.

 

[DK35vince]

No offence.
But that's got to be the wimpiest QA torque tube setup I have ever seen.
I would cut the thing off and weld something heavier duty in there if it were mine.

 

[kennyd]

No offence.
But that's got to be the wimpiest QA torque tube setup I have ever seen.
I would cut the thing off and weld something heavier duty in there if it were mine.

It's not supposed to be a "torque tube" it's just a timing bar to keep the QA shoes somewhat aligned when an implement is not attached. The JDQA system get its rigidity from the implement (bucket, forks, grapple) that is mounted.

Yes, the shear pins break easily...no big deal-they don't even "need" to be there. There are LOTS of threads over the years discussing the same subject since the JDQA setup was introduced.