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#17092 - 06/22/16 08:34 PM
Backhoe Main Pivot Construction Question
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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Some several years ago I ran across "myfordtractors.com" and printed off the build sequence for a backhoe on a Ford 8N as a reference. Recently I went thru "500 Passwords" UTube videos.
I'm in TX about 40 mi NW of city center. We had a drought which killed grass, trees, etc lasted several years. Last couple of years we've been nominated for the "ARK" award with water everywhere. My yard still has not recovered from being baked and then washed away.
I live on a mountain (134' above sea level)so floods don't worry me too much, but running water does. So my backhoe reference has become a necessary tool to add drains and ditches to my lot.
My tractor is a Ford 841. It is similar in size to an 8N with live hyds and more HP. The unit has a FEL with an undercarriage that I can attach the hoe to (will not be a 3 point).
One of the builds uses bolts and pipe as the main pivot, while the other uses drill rod and heavy wall tube in the pivot.
What I'm calling the main pivot is the swivel joint at the base of the boom, attaching it to the fixed frame.
My use is not commercial so I not inclined to use 1/2" wall DOM or drilled bar stock nor am I inclined to use pipe and Grade 8 bolts for the pin.
A number of people here have built hoes and put them to use. My question (finally)is what are you using and how has it performed for you? If you have dwgs or sketches I would appreciate seeing them.
Suggestions, comments, questions.
Old as Dirt JLG
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#17120 - 06/27/16 10:12 AM
Re: Backhoe Main Pivot Construction Question
[Re: bunkclimber]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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Bunk, thanks for your input. I agree with your comments, especially on greasing wear points.
Can you share your experience on how to construct the boom pivot. Originally I had planned to attach the main pin to the boom and have the wear point be in the upper and lower fixed mounts. I'm inferring from your comment that I should fix the pin and allow the boom to rotate on the pin.
If you have dwgs I would appreciate seeing them (This assumes you can or wish to share them).
Again thanks for your comments. Thanks JLG
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#17127 - 06/27/16 08:51 PM
Re: Backhoe Main Pivot Construction Question
[Re: bunkclimber]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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f350 - Bunk Appreciate your comments. I'll have to rethink my boom attachment/pivot assembly to utilize a taller pin and lower the forces the movable assembly sees.
I may be forced to endure tractor salesman BS so I can inspect some commercial hoes. Oh well small price to build and own your own hoe.
JLG
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#17143 - 06/29/16 09:03 AM
Re: Backhoe Main Pivot Construction Question
[Re: bunkclimber]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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Ah! the advantages of old age! Forgot I had trolled the web looking for main pivot pictures. Found 2. One of a Kubota and one of Prairie Dog Digger (Hey, I just write'em like I find'em).
Both feature a double pin (upper-lower) and the hinge assembly is a weldment. Which is great, means the hinge can be constructed using commercial flat stock and hand tools I have. Plus minimal machining as my abilities are limited.
IF you're interested, the pictures are on the net. To view the pivot assembly of a Ford/NH 4500/775 go to Messick's they have the NH parts manual online that has line dwgs of the hinge. These are industrial level castings.
Thanks to all for their comments. JLG
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#17149 - 06/29/16 06:38 PM
Re: Backhoe Main Pivot Construction Question
[Re: bunkclimber]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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The Prairie Dog hoe has the swing cylinders mounted under the drawbar side by side. Only one I've seen like that. Although the Prairie Dog is a commercial grade hoe fabbed up out of flat stock and structural I think for what was called CUTs. So space between the rear wheels is limited.
I was thinking of 30* for the swing cyls (or so).
I doubt if I'll rip them off, more likely just f up the boom or break the rear end casting on the Ford. Something that will elicit the comment "how in the hell did he do that"?
JLG
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#17177 - 07/04/16 09:56 AM
Re: Backhoe Main Pivot Construction Question
[Re: Old as Dirt]
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MBN member
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Registered: 02/25/10
Posts: 316
Loc: dexter, mn
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_________________________
so many irons, so little fire
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#17181 - 07/04/16 06:19 PM
Re: Backhoe Main Pivot Construction Question
[Re: nnaatz]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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Thank You for the excellent pictures. Good pictures will keep me out of the clutches of tractor salesmen.
My choice is to construct a bolt on unit as it moves the weight closer to the rear axle and I have a FEL with a sub frame that I can tie into. One of the comments that I've seen is that the 3P makes the front end light on the Ford 8N. My 841 is similar in size, but heavier. Unloading the front end is good thing as the Ford Ag tractor is designed for cultivating potatoes not digging. The Industrial units have a much beefier front axle assembly, better trans/clutch.
Again excellent photos and I will copy them to my file for reference, Thanks
JLG
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#17186 - 07/05/16 07:28 AM
Re: Backhoe Main Pivot Construction Question
[Re: f350ca]
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MBN member
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Registered: 02/25/10
Posts: 316
Loc: dexter, mn
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Definitely go with a sub frame this works ok Cuz it's on a 110 hp 12000lbs tractor the 3 point twist and rocks a it swings and pulls....we have put it on the 871 ford tractor and is considerably less stable an strains the top link rocker to much
_________________________
so many irons, so little fire
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#17187 - 07/05/16 07:31 AM
Re: Backhoe Main Pivot Construction Question
[Re: f350ca]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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f350 Nnaatz's tractor is a tank! Way too big for my needs, but certainly suited to todays big farms. When I was a kid we thought 100 or 200 acres was a BIG farm.
I have read a number of complaints of broken, bent lift arms and broken rear trumpets on smaller tractors like the 8N.
If you like tractor porn, google "bfreaky". He detailed a backhoe build on a tractor similar in size to nnaatz's on Tractor by Net. It is the "Swinsuit" issue for backhoes.
There is also a Youtube of the finished hoe working. I don't recall any tags to use in a search.
JLG
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#17189 - 07/06/16 07:06 AM
Re: Backhoe Main Pivot Construction Question
[Re: f350ca]
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New in town
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Registered: 05/15/16
Posts: 10
Loc: TX USA
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f350
Your description had me envisioning a ratty POS hoe. I'll be very happy if my turns out to be half as nice as yours.
Are all the cylinders the same size? It appears the boom mtd ones are larger. Are you running it off the tractor hyd system or a PTO pump?
I'll have to add a front pump on mine to get enough flow as the integral pump has limited volume although the trans/diff is the hyd oil sump on the Ford.
Nice Build. Spray it with Ospho, it will turn it black and stop the rust.
JLG
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