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Re: Leaky hydraulic valve on backhoe pictures


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Posted by NCWayne on July 25, 2011 at 06:50:34 from (98.21.228.208):

In Reply to: Leaky hydraulic valve on backhoe pictures posted by Justin SE IOWA on July 24, 2011 at 19:22:18:

As others have said there should be some sort of seal under the little flat cover with the two screws in it. Many mfgs tend to use the same brand of valves in all of their equipment and many brands tend to seal their products in one specific way. That said, I just resealed the spools on a Vermeer machine for a customer last week. All that was under the cover on that machine was an O-ring and another flat back up/antiextrusion ring. It's not that hard to get them out with a pick, and you DO NOT have to remove the valve spool to do it. In fact most spools on an application like this are going to have a return spring attached to the bottom of them, inside a cage, and short of taking that whole assembly apart the spool isn't going to come out anyway.

As far as getting the parts you need, O-rings used in an application such as this are typically going to be a 90 durometer instead of the common 70 durometer that you typically find in kits. While the 70 will work for a sort term they are more likely to wear out and need to be replaced again more quickly than the 90. Too O-rings used somewhere like this can often be odd sized/metric/etc, something else that's going to be all but impossible to find in a standard kit. In other words your best bet is to go ahead and get the parts from Vermeer and solve yourself some future headaches. The pieces aren't that expensive, and if it were me doing the job for a customer I'd also go ahead and reseal all of them. Given the application, them being outside in the weather, etc, etc, the condition of one in a case like this is usually indicitive of the condition of all of them. In other words if one isn't leaking today it'll probably leak tomorrow, right after you get the seal in another one replaced and everything back together. Like the old saying, "A stitch in time saves nine". Good luck.


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