Backhoe Hi everyone. NewB with dumb ?? about backhoe

[grandad]

Just a friendly word of caution here... please don't anyone get their dander up if you don't agree.

You guys are talking about rigging up a set of longer links to the 3pt attachment points because the backhoe is too snug against the cab on this 3710. Not any kind of an expert on 3pt backhoes, but seems to me this sets the hoe farther back from the tractor. The problem with that - again what do I know - is that it would allow the operation of the hoe to exert greater leverage against the attachment points where it joins the tractor.

Being that you are using the 3pt attachment points, which take a lot of stress with even a standard 3pt backhoe installation, the extension may be getting you outside the limits of what the back end of that tractor was designed for.

If you only used the hoe occasionally and did so conservatively, you'd probably never have a problem, but you said a few msgs back you have a respectable amount of work in store for this rig. IMHO that really begs for a subframe mounted backhoe. Just something to think about.

 

[MMM]

</font><font color="blue" class="small">( extensions that slide outta the end of the arm. )</font>

You'd better be careful dude, You're sitting on this machine that you're thinking of jury rigging to your tractor. You've got a lot to lose if it fails. I'd at least find longer lift arms, if not using a subframe. I lost a pin while I was on mine, and that incident was the deciding factor on builing a subframe....and a little closer walk with the Farmer above..

 

[GuglioLS]

This sub frame thingie sounds interesting and alot safer.
Attached is a picture of my top link mount for the Bradco Backhoe.

Does anyone have some detailed pictures to attach?
Several examples and designs will be needed to get some good ideas.

I can only guess that 3 PT BH's are available only because of market demand to get a quickie Backhoe. And not because it is the best or safest way to go.

I do have to agree that the 3 pt BH puts ALL the stress on the top link. This is what I have. The Bradco models we have 3265 & 3375 were designed for 3 PT.
The steel brackets for the 3PT mounting kit that comes with them are very massive and stiff. However everyone is correct in that all the digging stress is sent to the top link pin. I will be careful and yous guys have me convinced I should start thinking and looking about getting / desigining / buliding a sub frame. I do respect your experience and wisdom. Your persistance is paying off - keep it up to educate guys like me! /forums/images/graemlins/blush.gif (Humbled)

 

[GuglioLS]

Here is a picture of the lower end of the mount showing the lift arm and the "triangle" 3 point mount system from Bradco. Sorry about the trashed tractor - just got back from pulling some poor fool that decided to try and drive down our impassable mud "road".

 

[grandad]

The problem is not necessarily the link itself... looks like yours are pretty strong. But here's a photo of what can happen when you overstress the 3pt attachment points on the tractor. This is a photo of a Kubota (it's not mine, but it's the same model as I own, so it touches close to home for me!) with the whole back end of the rear differential ripped off by a 3pt logging winch.

If you were digging and prying with the backhoe and something like this let loose right underneath your keister, it could ruin your whole day.

 

[grandad]

Here is a link that shows some great pics of detaching a Kubota subframe backhoe. Several of them show how a subframe is integrated into the tractor so it provides a strong yet easy place for attaching the backhoe.

There is some serious engineering behind the design of a subframe to make it fit like that and not interfere with the 3pt.

Since you have Bradco hoes, I'd start out by contacting them, even if you decide to fabricate something on your own. They probably won't give you any encouragement about a do-it-yourself subframe for liability reasons (I don't either!), but maybe they would give you some photos or diagrams of the subframes they make.

web page

 

[GerardC]

OUCH! How do you go about fixing something like that, or do you??

 

[GuglioLS]

Yikes /forums/images/graemlins/shocked.gif - that's not going to grow back.
I cheked out all the posts for the link you supplied. The subframe is a fine feat of engineering. I think I am going to be wearing extra padding under my kiester from now on. Thanks for sharing.

 

[grandad]

This picture was actually supplied by one of the other TBN'ers, who I think was going to repair it for the owner. Never heard how it turned out, but it would basically involve a new rear end casting and the dis-assembly of the old internals and re-assembling them in the new housing. Maybe not too costly on parts, but lots of skilled - and probably expensive - hours doing the job.

 

[GerardC]

<font color="blue"> Yikes /forums/images/graemlins/shocked.gif - that's not going to grow back. </font>

LMAO!