Backhoe Most common failure of 3PH mounted backhoe?

[nykyfyr]

Anyone have any idea what the most common type of failure occurs with 3-point hitch mounted BH's?

Thanks

 

[boustany]

maybe a mechanic could answer, but the disaster scenarios (splitting the tractor, etc) don't seem t happen that often.

I had a poorly designed/welded link pin come out of mine, and I suspect the next most likely failure is a hydraulic hose going to the pump (it's easy to squash them during install).

Plus the zerks seem pretty vulnerable, so I've had to replace a few ...

 

[Henro]

<font color="blue"> Anyone have any idea what the most common type of failure occurs with 3-point hitch mounted BH's?
</font>

I could not help but think that the most common trait may be that they don't fail any more than other type backhoes...

There have been reports here about tractors with 3PH backhoes on them breaking...worst case in half maybe...but those reports seem relatively few and far between. Guess that would be a tractor failure anyway, right? /forums/images/graemlins/blush.gif

Common sense says a sub-frame mounted backhoe would have to be a better setup than a 3PH backhoe. But honestly, I don't fear my 3PH backhoe breaking, or breaking my tractor. I did have a couple small issues with mine...a blown hose and my boom lock pin popped off when I forgot the boom lock was engaged...for some reason it was never welded in place...but that is another story I suppose...
/forums/images/graemlins/crazy.gif

If you are considering a 3PH backhoe it would be wise to make sure you understand the requirements for mounting one on your tractor. For example, my tractor requires a long bracket (AKA subframe according to Kubota) on each side, which ties the rear axle housing to the loader frame, and also a heavy-duty top link bracket. Without these two items, there would be risk (more risk???) of breaking something.

 

[rswyan]

</font><font color="blue" class="small">( For example, my tractor requires a long bracket (AKA subframe according to Kubota) on each side, which ties the rear axle housing to the loader frame, and also a heavy-duty top link bracket. Without these two items, there would be risk (more risk???) of breaking something. )</font>

Henro,

Let me get this straight - your backhoe uses a subframe to the FEL subframe ? Don't you have a Kubota 4690 'hoe ? And a B2910 ?

Just wondering ....... cause mine (also a 4690 'hoe on a B2910) didn't come with one ...... just wondering if my dealer missed it when he spec'd and ordered the 'hoe.

 

[Henro]

<font color="blue">
Let me get this straight - your backhoe uses a subframe to the FEL subframe ? Don't you have a Kubota 4690 'hoe ? And a B2910 ? </font>

Yes, that is why I said AKA subframe... /forums/images/graemlins/smile.gif

The Kubota manual says "sub frame required" somewhere in it...and what they are calling a subframe is two brackets that are about 2' long, that replace shorter brackets on the side of the tractor. These things really do not fit the form of a real subbrame...but maybe with a stretch of the imagination... /forums/images/graemlins/crazy.gif

So I guess the BL4690A is a "subframe required" but pretty much subframeless 3PH backhoe... /forums/images/graemlins/shocked.gif

If you look under the tractor there should be a bracket on each side that extends from the rear end to the loader frame. I can take a picture if it would help. These brackets are gray on mine and roughly 3/8 thick by about 4" high and maybe 30" long. What came off was about the same height and thickness, but maybe 12" long. I only know this because I was given the brackets that came off... /forums/images/graemlins/smile.gif

I think it is kind of funny that the manual says somewhere "subframe required" and the only "subframe" I can find is those two brackets...if that is the right term for them... /forums/images/graemlins/blush.gif

Hope this helps... /forums/images/graemlins/smile.gif

 

[rswyan]

</font><font color="blue" class="small">( Yes, that is why I said AKA subframe...

The Kubota manual says "sub frame required" somewhere in it...and what they are calling a subframe is two brackets that are about 2' long, that replace shorter brackets on the side of the tractor. These things really do not fit the form of a real subbrame...but maybe with a stretch of the imagination...
)</font>

When I purchased my BL4690B backhoe from the dealer the deal I cut had the 'hoe shipped directly to me crated and I did the assembly & installation myself. There was nothing like what you are describing included with the 'hoe - hence my interest.

The only thing that came with it, as far as attaching parts, were the HD reinforced top link bracket and hardened pins, which replaced the standard issue items already on the tractor. Of course, it included a HD mast to connect the 'hoe to the top link of the tractor. Other than that the only other thing that even approaches what you are talking is the 3PH lift limter but I don't think that is what you are referring to.

</font><font color="blue" class="small">( If you look under the tractor there should be a bracket on each side that extends from the rear end to the loader frame. I can take a picture if it would help. These brackets are gray on mine and roughly 3/8 thick by about 4" high and maybe 30" long. What came off was about the same height and thickness, but maybe 12" long. I only know this because I was given the brackets that came off... )</font>

Since I did the assembly and installation myself I can pretty much say with absolute certainty that there isn't anything like this on mine - didn't come with it - unless it came with the FEL or MMM which were already installed when I got the tractor from the dealer.

It could be that it is an additional part number specific to whatever model tractor that it is being installed on (which would make complete sense)

Yes, I'd love it if you could post a pic - and perhaps post the part number if you have it handy.

 

[Archdean]

Perhaps this will help, this is on my B7510hst with a B4672A backhoe and yes the subframe was ordered seperately but the beefier top link mount came with the hoe!!
Dean

 

[MessickFarmEqu]

I think the confusion here is that the Kubota hoe is marketed as a subframe hoe, yet its kinda not. They stiffen the underside of the tractor without running a full subframe. It works, and it preserves your ground cleareance with the hoe on. Down side is that the mount is not as secure as a full subframe. We sell Woods 6500's as substitutes in many cases.

3pt mounts are fine for light use on 30-50hp tractors. Machines of this size I would not risk it.

 

[Henro]

Here is a shot from the right side of the tractor....you can see how the gray bracket attaches to the loader frame and extends back to the rear end...

 

[Henro]

This is a shot of the brackets that I was given, that were removed when the backhoe was installed...