646-75lbh Restoration

Discussions on restoring tractors.
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Spike188 Canada
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646-75lbh Restoration

Post by Spike188 »

This was a purchase made online at 1 AM. Going to bed early does not always pay off, and waking in the middle of the night and checking a Case web site is not recommended "but". A member posted that there was a new listing on FB marketplace and did not have and account. Much to my surprise a pm to the owners daughter at 1 am brought a quick response. It was listed at $2500 CD. Davis backhoe attachments in any condition list at $4,500 CD on kijiji which made this a Buy Now price that couldn't be passed up.
646BH dropped at home.jpg
646BH dropped at home.jpg (883.55 KiB) Viewed 4688 times
By morning at 7:30 the owner said he had 40+ responses to the ad and one person showed up at 7 but declined making and offer due to the amount of work needed to put it back in usable condition. Afraid of loosing it I called a friend with a roll-off and drove 1.5 hours to get.

The first test made was hanging the back hoe off of a forklift and hooking the hydraulic up to a 646L. Because the backhoe requires a "case drain" that was added to the 646L.
Bh test.jpg
Bh test.jpg (577.25 KiB) Viewed 4688 times
That test went well. Then reality set in.

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Re: 646-75lbh Restoration

Post by Eugen »

Great story so far!

Eugene, by the way, did you see that Case-Davis 430 with loader and backhoe that was for sale at around 6000 on kijiji? I was so tempted, but I didn't know how I could transport it. Plus, it disappeared in about one hour.
Case 224, 444, 446, 644, 680E
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Re: 646-75lbh Restoration

Post by Spike188 »

I didn't see it. I have noticed them around the Toronto area occasionally.
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Re: 646-75lbh Restoration

Post by Eugen »

That looked like twice the machine a 646 is, at less the price. I wish I got it.
Case 224, 444, 446, 644, 680E
Massey Harris 33
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Re: 646-75lbh Restoration

Post by Toolslinger »

Where did the hoe have a case drain? I've never seen that in a D-100 manual, they've all been plumbed in series with no drain. I had to put a tank line on mine, but that was only because I had to replace the entire stack valve when the end block cracked for some reason...
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Re: 646-75lbh Restoration

Post by Spike188 »

Tool Slinger, I am not sure about calling it a case drain but there are 3 lines at the hoe.
Hose configuration lables.jpg
I labeled the picture with the terms used in the parts manual.

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Re: 646-75lbh Restoration

Post by Toolslinger »

I'm going to have to get out to the tractors soon now... I know my early machine only had the two hookups untill I had to work on it. I guess it's possible my later unit has all 3. It's been a while since I had to do anything other than run that one, and it's all tucked behind the weight, so perhaps I'm just not remembering...
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Re: 646-75lbh Restoration

Post by Spike188 »

5 months ago a rebuild of the hoe spool valve was started.
backhoe valve rebuild.jpg

It took $90.00 worth of o-rings. 4 between each valve, 2 on each spool and 6 on relief valves.
Valve washer r.jpg
Missing was a spool stop washer that is 1" OD X 0.5" ID X 0.155 Thick. This is not something found on the shelf. With covid making it impractical to run out and pick up a solo item, scrounging became the next option.
vavle washer stock.jpg
A 1" bolt was found and cut off at the thread end of the shank.
Valve washer center hole r.jpg
After chucking the donner bolt in the drill press a 0.5" hole was drilled into the shank body, deep enough to get 2 washers if needed.
valve washer slice r.jpg
The washer was sliced off of the shank, and belt sanded to the final finished thickness.

It wasn't a big job but one of those items that became a job stopper.

With that project out of the way, space can be made for starting the engine rebuild.

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Re: 646-75lbh Restoration

Post by Eugen »

Even a washer is good progress when it's the one thing that blocks you!

How are you able to get such smooth finish on the outside surface of the bolt? Wanted to make something out of a bolt and the best I could do on my small Myford 7 is this, quite rough surface compared to yours.
E00B0304-35B1-4B76-9DCF-8EE6BB3835B4.jpeg
Case 224, 444, 446, 644, 680E
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Re: 646-75lbh Restoration

Post by Spike188 »

Emery cloth or sandpaper while spinning in the lathe.
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