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Re: 723 Backhoe Valve Seal

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Author  [Modern View]

02-22-2013 18:15:35

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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.

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Andy Wickiser

02-23-2013 10:18:06

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 Re: 723 Backhoe Valve Seal in reply to jaluhn, 02-22-2013 18:15:35  
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.

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