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  1. #1
    Veteran Member kebo's Avatar
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    May 2006
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    Lexington, SC
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    2001 John Deere 790 4x4, bar tires

    Default Now THIS is a log arch!!

    I was surfing CL (like I always am) and came across this interesting log arch for sale. The story from the seller was that it belonged to his F-i-L, who used to run a sawmill. The log arch is home made, and HUGE, but it looks to have been very well thought out and very well constructed. He only had 3 pic's posted, but I emailed him and asked him to send me some more. The seller was gracious enough to do so, and I thanked him for it, even though I wasn't really interested in buying the arch. I was more interested in how it worked. I spent probably 20-30 minutes studying over these pic's to figure out just how it worked. It's quite ingenious, actually!!! My hat's off to whomever built it! The best picture showing the whole thing from the side was on the CL post. I tried saving them to add here, but for some reason they came out as thumbnails and not worth adding here.

    The tongue of the arch attaches to the tractor, as well as the really long PTO shaft on it After driving (or backing) over the log, you would hook up the cable to the log and engage the PTO to winch the log up. The PTO shaft directly drives a car axle mounted on top of the arch (sitting directly above the tractor wheels). One side of the car axle has a small dia. tooth gear on it, which directly drives a larger dia. tooth gear, which gives it a torque multiplication. The larger gear has a shaft attached to it, which is the shaft for the log winch itself. On the other side of the car axle is a standard brake hub. If you notice in one pic, there is a master brake cylinder mounted close to that end of the axle, which can be controlled by one of the two long rods that goes up to the front of the arch. By pumping the brake, I suppose you can control or stop the axle from turning after the PTO is disengaged.

    One the other end of the winch shaft, there is another large dia. tooth gear. It looks like the other long rod (that goes to the front of the arch) has some sort of a pawl that can engage this gear (with slightly angled teeth) to lock the winch in place (thus holding the log up off the ground). Now is this thing slick or what??? If I needed one, and had a big enough tractor, I would be headed that way to look at it already! If you're interested, it's near Oakboro, NC. I think that's close to where the FarmTrac tractors were at, before they went out of business (not that it has anything to do with this).

    Sort of a front view:

    -image-2-jpeg

    Here's the tongue showing the end of the PTO shaft:

    -image-4-jpeg


    Here is the winch cable hanging beneath it:

    -image-7-jpeg


    Here you can see the PTO shaft and brake master cylinder with the long rod for it:

    -image-9-jpeg



    Here is the "locking gear" on the winch shaft, notice the angled teeth:

    -image-10-jpeg


    The two levers near the front for the brake lever and locking pawl lever:

    -image-6-jpeg

    View looking from the rear. Gives you some idea how big it is. Also shows the winch and cable:

    -image-13-jpeg

    Right side tire also looking from the rear:

    -image-12-jpeg
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

  2. #2
    Elite Member
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    Jul 2009
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    4,277
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    SW WA
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    Kubota BX2360

    Default Re: Now THIS is a log arch!!

    By pumping the brake, I suppose you can control or stop the axle from turning after the PTO is disengaged.
    When the PTO is engaged and turning, only the arch brake drum will turn. Applying the brake will cause the other axle to run the winch. Releasing the brake will stop the winch and the pawl will keep the log up. The brake controls the winch by using the differential action without having to engage and disengage the tractor PTO.

    Bruce

  3. #3
    Gold Member dbaer78's Avatar
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    Apr 2012
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    nashville,indiana
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    kubota mx5100hst

    Default

    Very cool. Thanks for sharing. This gives me yet another idea for a future project.

  4. #4
    Veteran Member kebo's Avatar
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    Lexington, SC
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    2001 John Deere 790 4x4, bar tires

    Default Re: Now THIS is a log arch!!

    Quote Originally Posted by bcp View Post
    When the PTO is engaged and turning, only the arch brake drum will turn. Applying the brake will cause the other axle to run the winch. Releasing the brake will stop the winch and the pawl will keep the log up. The brake controls the winch by using the differential action without having to engage and disengage the tractor PTO.

    Bruce
    Hey Bruce, I think you're basing that thought on the axle having an open differential, and if it does, I completely agree. I fully understand how an open differential works but I was thinking it would have a limited slip, or even a solid axle (like with the spider gears welded up). Never having seen it in operation, we can't really say for sure though which it has though. You may be right, though.
    Nothing could be finer than riding my JD790 in South Carolina!!

    2001 John Deere 790 4x4 with Model 70 FEL, 5ft International World Agritech bush hog, 5ft Wallberg BB, 5ft Frontier disc harrow, 5ft King Kutter II Rototiller, 5ft Cultipacker, 5ft Sitrex finish mower, Leinbach PHD with 9" & 12" augers, Leinbach middlebuster, Leinbach #11 Field Cultivator, boom pole, custom 3pt handi-hitch, clamp on bucket forks, Pat's Easy Change.

    Nothing runs like a Deere, or smells like a John....

  5. #5
    Silver Member
    Join Date
    Dec 2010
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    151
    Location
    Washington state and Ak
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    5300 John deere,53 harry ferguson, ck20 kioti, 135 ferguson, 350jd dozer, k40 kubota excavator

    Default Re: Now THIS is a log arch!!

    You wouldn't want a solid axle or limited slip in this rig. Having the brake for control gives some room for slippage incase of a hangup. Here in Wa and I suppose other states they use this type of arrangement for hoisting bales of hay on trucks. Having a boom on a pickup that stands up, and a shortened axle with a bandbrake on one side and a winch spool on the other side they are able to send up bales as fast as a fellow can stack them.

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