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723 Backhoe Valve Seal

J

jaluhn

Member
Been working on getting my 3500 back to working order again - now it runs but I'm chasing down all the hydraulic gremlins. I've wound up replacing all the loader hoses and 3/4 of the backhoe ones, but now it looks like it blew one of the backhoe valve spool seals.

Does anyone have the part number for the seals & O-rings? For some reason the New Holland parts site isn't recognizing any of the 723 part numbers. (19-299, 300 or 301) Can you get a valve rebuilt kit? Are they industry standard parts or ford specific?

Also, are there any tricks to doing those seals? From the manual it looks pretty straight forward but I know sometimes the manual makes thing sound easier than they actually are...

Thanks,
~John
 
I just bought a parts book for the 713/723 on Ebay but it's at home now. I can post the page for the control valve later if you want. Not sure if the numbers will still be good or available. You should be able to match up the O-rings and seals from off-the-shelf items - when it comes to 713/723 maintenance improvisation is often required. A place like Baum Hydraulics should be able to match just about any seal out there if you can't find locally:
Baum Hydraulics
 
If you could post it or email it to me <jaluhn<at>gmail> I'd appreciate it. I was able to get the parts diagrams through Messick's a month or 2 ago when I started looking at hoses, and it looked like a decent number of the parts were still available but now it woln't pull up the 723 hoe.

Plan be would be to match the o-rings, but I'd rather have them on hand before I pull it apart.

Right now it works it just dribbles some when using the loader. I had thought it was pissing gallons of fluid but it turns out it was mainly the puddle leftover from changing hoses.
 
From Ford Backhoes Series 713 & 723 Parts Book March, 1968.
Ford723ControlValveResized.jpg
 
Thanks!

Ironically Messicks's started working as soon as I called the sale rep to ask for a diagram.

However, it turns out that the problem wasn't the seal after all. It's actually a crack in the back of the valve body itself....... :cry:

It's a peculiar crack - about 1 1/2" long, horizontal and about 1/4" down from the top of the valve body. It seems to connect to the upper fluid drain passage. The only thing I can think that would have caused it is someone bottoming out the valve stem seal flange bolt.

Any thoughts on fixing it? Anyone ever tried welding a crack like this? I don't think JB Weld will hold enough pressure, especially with the top section flexing under pressure. I'm thinking of grinding a groove and then hitting it with the mig welder. I'm hoping that if I do it in very small sections it woln't heat up enough to warp or damage the seals.
 
Well (for what it's worth) if it's a seeping leak on a return-side passage JB weld may work with proper preparation to remove all oil from the bonding surface and rough up site by grinding down to bare metal and V-ing the crack. Other than that you might want to take a picture of the crack and post to Tool Talk where the welders hang out.
 
It's return side on the backhoe valve, but with the way the system is setup, it's subjected to full line pressure when using the loader. JB weld might hold the pressure, but the flex would kill it.
 
Welded it up yesterday, and it worked decently. It's not a pretty weld by any stretch, and it's got about as many pinholes a block of swiss cheese (Most likely cause I welded in in place without draining) but it's 95% better and at least functional now. No issues with binding or seal damage which was the biggest thing I worried about.

At some point I'll take it off and do a full rebuild and grind the booger weld off so I can do a proper welding job but for now it's working. Got to have some fun playing with the old girl last night digging out bamboo roots for the landlord. :lol:
 
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