Replacing o-rings between hydraulic valve sections?

[charlz]

My b670 backhoe for my Kubota b7100 has developed a leak between the relief valve section and the section next to it. Is it possible to loosen the sections and replace just the o-rings between those two sections that are leaking? Is it that 'simple'?

I looked up the 'repair kit' listed in the parts manual and they want $78 per section! The kit includes some seals that go on the spool etc but that is not what is leaking and I don't really want to take everything apart. I am hoping I can just match up the o-rings with some new ones and be on my way. Thoughts?

Thanks!
Charles

 

[RickB]

No reason you can't simply match the o-rings that seal the valve sections and end covers, leaving the spool seals alone. But you would be wise to replace ALL of them the first time.

 

[Zebrafive]

Be sure and find out the correct torque for the sections, too tioght and valves will bind. I think you can replace just o-rings and be fine, just do all in a section, not just the ones that look bad.

 

[mrmikey]

Be sure that they're 'O' rings an not quad (square cut). As Rick said, for the price you'd be wise to replace them all once you've loosened the valve sections.....Mike

 

[charlz]

Thanks guys, the manual has the correct torque and torque procedure so I am good there. I probably won't tackle this until later this fall/winter when I am for sure done with the hoe. Right now it is not bad enough I can't just keep the oil topped off until I am done digging. Here is keeping my fingers crosses I get a few more hours of digging out of it to finish this project

 

[wdchyd]

. Is it possible to loosen the sections and replace just the o-rings between those two sections that are leaking? Is it that 'simple'?

Make sure you remove the valve assy to do a complete flush and clean...especially between the valve sections.....if you were to have so much as a single grain of sand between, the valves will warp under torque-up.....possibly rendering a few sections junk......don't go there.....:thumbdown:

so three words of advice......clean, Clean.....CLEAN....:2cents:

As far as matching up seals.....easier to match up on valves made in USA but not as easy on the import stuff

 

[charlz]

Thanks for the heads up. It is leaking worse than I thought so I will probably have to tear into it sooner rather than later

 

[cyrush]

Yes you should be able to replace the o rings between the slices only. As a tip use a thin film of petroleum jelly (vaseline) to keep rings in place whilst you reassemble and torque up the slices.