yet another custom backhoe subframe

[dfkrug]

Here is another of my full custom backhoe subframes....this time
for a Kioti CK30. This one was my hardest and most ambitious so far.
I have now done full custom subframes for an L2500, two JD 955s (2
diff kinds of subframes), a CK30, and a factory old style subframe from
Woods for an L2550.

A goal for this project was first to get the best subframe I could
do for this tractor. Not all the best criteria were compatible, however.
e.g. the quickest attachment method may not be the tightest. Anyway,
after building a few different kinds of frames and carefully evaluating
factory frames, I decided on this implementation. I have modeled my
subframe after the tightly-coupled frames you may see on a small
commercial-duty machine like the L39 or even a larger CASE 580. Mainly
this means a "4-pt" attachment with some sort of alignment aid at
the lower section of the subframe. The hoe is tilted into the lower
part and secured with bolts or pins at the top. I went with bolts, since
they allow less wiggling. Professional machines also mount the hoe as
close as possible to the back of the tractor. I have done this, too.
There is no use of the 3-pt bracket to secure the hoe. Finally, I
wanted the 3-pt arms to not have to be removed when the hoe is
mounted.

The CK30 was tough to do, due to all the exposed hydraulics underneath.
Now they are pretected!

These pix are the results. There is no detectable wiggle or flex, I
am happy to report.

I may try one of Woods' new 4-pt frames for another Kioti this summer.
Then I will have more to compare it to.

 

[Mr Grizz]

Very nice job dfkrug

 

[montejw]

Nice. Can't wait to start mine.

Monte

 

[whodat90]

Looks great, very factory. The rops police are coming for you, though.

 

[dfkrug]

Nice. Can't wait to start mine.

Monte

Thx for the support, guys.

Monte, I thought you would be mounted by now. Let me know if you
need a thumb for your 'Dog.

As for the ROPS, I was wondering when I would hear something. The
stock height is reduced 8-9" so I can clear my 8-ft roll-up door. The
ROPS is still a foot+ higher than my noggin. Sometimes I don't even
wear my seatbelts, but don't tell anyone....

 

[montejw]

Thx for the support, guys.

Monte, I thought you would be mounted by now. Let me know if you
need a thumb for your 'Dog.

As for the ROPS, I was wondering when I would hear something. The
stock height is reduced 8-9" so I can clear my 8-ft roll-up door. The
ROPS is still a foot+ higher than my noggin. Sometimes I don't even
wear my seatbelts, but don't tell anyone....

Done? Haven't even cut a piece of metal yet. I'm going from scratch, have a set of drawings that I'm going to have to make changes to most likely.

The thumb caught my eye. I'll have to look at it more, but I think I see how it works. Got any pictures of the bucket extended?

Monte

 

[joes_427_vette]

Nice work, looks like it will do the job. I have gone through 3 drawings and still not final on my sub frame. I'm mating a bradco to a NH tractor. They want 2k for the mount with shipping. I think it can be done for the price of the steel. I was thinking of the over axle braces also but would there be alot of flex in the length of steel involved. I guess it could also be tied into the upper axle mount plus the three point upper control. I want to make sure it is strong enough.

 

[mudcat]

Outstanding job!!! Very nice presentation also.

 

[dfkrug]

I was thinking of the over axle braces also but would there be alot of flex in the length of steel involved. I guess it could also be tied into the upper axle mount plus the three point upper control. I want to make sure it is strong enough.

Flex is definitely bad. My over-the-axle braces are very hefty and
have almost no curve to them. Where there is a slight curve to get
around the axle housing, it is welded up double-thick to 1.25". I was
more concerned with where it attached to the channel frame. From
the operator's seat, I could see no apparent flex. I also used 12 total
bolt holes in the rear casting to support the lower section of the
subframe. My subframe prob weighs about 200# total. Looking at
what Woods did for this tractor, I see they avoided the whole issue
of wrapping around the axle by attaching to the bottom and top of the
rear casting. Easier to make, but I think mine will put less bending
moment on the middle of the tractor.

I am running my hoe at 2500psi and this tractor of about 5000-5500
lb is quite easily lifted and dragged by the digging action.

 

[design]

Dfkrug,
Nice job.

Has anyone contemplated mounting a "quick hitch" cat 2 bracket to a custom sub-frame (attached at the rear axle, and the loader mounting plates.)
With the quick hitch, I think it may be possible to then use a 3 pt. hitch frame on the back hoe. The frame whould carry the top link loads to the sides into the subframe.

Picture a 4 point subframe that has the quick hitch mounted in place of the lower connecting points and a single link/bolt at the top in the center. The frame then carrys the bending loads to the outside where it can be directed to the subframe.

Still trying to design the frame for the bh-9000 and the L2900.
Design