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  1. #1
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Well, I recently finished another backhoe subframe. This may be my seventh or
    eighth? I lost count.

    This is for a 2001 John deere 4300, and a new Prairie Dog 7.5, a Woods 7500 clone.
    I recently rebuilt this former rental tractor; the thread is here:
    http://www.tractorbynet.com/forums/p...-4300-hst.html

    Unlike the last subframe I wrote about, which was for the same model tractor
    and hoe, this one is considerably different. Followers of my other subframe
    threads can compare/contrast to my last 4300 effort here:
    http://www.tractorbynet.com/forums/b...wn-custom.html

    I did this subframe differently than the last for a couple of reasons: one was to keep
    me interested. I don't really like to do repetitive stuff. The other reason is to show
    that no single approach is better in every way. One way might be easier to make,
    but harder to live with. Another might provide more durability, or one may be easier
    to mount/dismount.

    Anyway this one is sort of a "Five-point subframe". It will be made in two main
    parts, a tractor-side ladder frame that stays mounted all the time. And a hoe-side
    frame that is permanently mounted to the hoe. The tractor side will not interfere
    with the 3-point hitch, and will provide some underbody protection to the exposed
    hydraulic lines. Hoe mounting/dismounting will be much easier than the other 4300
    subframe, which was one piece that always stayed mounted to the hoe. The
    new subframe will mount/dismount using only 2 bolts and one pin.

    First, I will post the DONE photo, showing how close-coupled the hoe is to the
    tractor. This one has the best departure angle of any I have done, with minimum
    tire-to-hoe clearance. Works great.
    Attached Thumbnails Attached Thumbnails -finished_4-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  2. #2
    Veteran Member
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    N. E. Florida

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    That's a good looking Hoe! (can I say that here?)
    The important thing with a subframe is that it protects the tractor center from the stresses.
    I got a great deal on a new closeout Jinma Hoe on ebay ($2200.) and modified the subframe to fit my 3510 Branson.
    I have a Welding/Fabrication Shop so it wasn't that bad of a project.
    The Jinma Hoe does OK but I wouldn't want to make a living with it!!!! I do have fun with it and it beats a shovel! I also made a 6" bucket for it for trenching which works great.

  3. #3
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    OK, the plan is to use some 1.5x3.5x1/4" channel, which I have salvaged from
    a now-defunct tractor dealer. (They were from kubota shipping crates.)

    These main rails will be welded to the lower ROPS bracket in the rear, and
    hang from existing holes in the tranny tunnel up under the foward middle
    of the tractor. I cut some 1/4" plate for the forward brackets and drilled them.

    I plan to attach all the bolted elements to the tractor, position the welded
    elements, then tack-weld them while mounted/positioned on the tractor.
    Then I will remove all the bolts to do the final welding.
    Attached Thumbnails Attached Thumbnails -sub_2-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  4. #4

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    I will look forward to seeing how you design and build this. On the list of things I want to do to my tractor.

  5. #5
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Here is the subframe after I tack-welded it, then unbolted it from the tractor.
    I like to use a series of small automotive-type scissors jacks to fine-position the
    channel steel before tack-welding. They are strong, secure, and are
    hand-adjustable.

    The forward section uses some shedule 80 pipe for transverse support. The
    rear support uses some 1/2" plate welded to the frame channel, and the
    ROPS lower bracket.

    The 1/2" plate is the only steel I had to buy.....I never have too much 1/2"
    plate lying around. I bought a 4' long chunk of 4"x10"x 1/2" angle steel
    as the salvage yard for .35/lb, or about $35. Part of that is for the hoe-half
    of the subframe, coming up.
    Attached Thumbnails Attached Thumbnails -sub_3-jpg   -sub_4-jpg   -sub_5-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  6. #6
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Here is the tractor-side of the subframe all welded and painted.

    On the forward supports, I boxed in the channel for strength.

    On the rear, I added some 5/8" bar at 45-degrees to the channel. This will be
    the only place where the subframe is bolted to the hoe-side subframe. I drilled
    the 1" hole first, so I could use my drill press. These holes will have SAE
    grade-8 1" bolts. (Sadly, hardware stores around here no longer carry one-inch
    fasteners, so I had to go to Fastenal.)

    Below the bolted element, I made a cradle in the channel to support a 1.125" guide
    pin. The hoe-side pin will rest in this saddle, and the hoe will pivot upwards to align
    the bolt holes. It will be clear in later photos.
    Attached Thumbnails Attached Thumbnails -sub_6-jpg   -sub_8-jpg   -sub_9-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  7. #7
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Here the tractor-side subframe is mounted to the tractor.

    The forward section uses existing holes in the tunnel casting (after
    cleaning out the threads. Unfortunately, the undercarriage armor
    in the rental service kit interfered, so I had to toss it. The frame
    rails provide substantial protection themselves, however.

    The rear attachment shows the ROPS bracket connection. Note
    the new bolts; these are critical and the original ones were rusty.
    Attached Thumbnails Attached Thumbnails -sub_11-jpg   -sub_10-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  8. #8
    Super Member mjncad's Avatar
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    A couple

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    That looks to be a nice clean design.
    Paraphrasing Douglas Adams - So long and thanks for all the bacon.

  9. #9
    Super Star Member RoyJackson's Avatar
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    John Deere 4400 MFWD, Deere 855D UTV and assorted implements

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Great job, dfkrug!!
    I wish I had your skills...and I wish I could still get near a welding machine.
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

  10. #10
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: making a subframe for my 01 John Deere 4300 and Prairie Dog backhoe attachment

    Thanks, Matt and Roy....I knew I could count on you to read this thread.

    Now for the hoe-side of the subframe.

    I positioned the hoe at the operational height I want using the two 4x12
    wood blocks. I also have my overhead crane supporting the boom for the
    correct tilt. I connected up the tractor hydraulics so I could operate the
    outriggers for the correct height. I want this to be pretty exact, so I
    am not going to count on hydraulics to keep the hoe in position.

    After that is all set, I will back the tractor up to exactly the place I want.
    Attached Thumbnails Attached Thumbnails -sub_12-jpg  
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

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