Backhoe Backhoe Control Valve

[VictorW]

Thank you for posting which o-rings you used. I was hunting for some because I think I'm on borrowed time. The bottom o-rings won't be to bad other than taking the valve assembly off the frame and all the hoses. I marked mine because they can easily get mixed up. Be careful when removing and installing the screw that holds the centering springs on. If I remember right, they are little 5mm screws. Mine came out pretty easy but don't torque them down to tight. They're similar to the ones holding the centering spring caps on.

 

[JoelD]

Yes for me bottom was same white o-rings and white sweeper washers. I’ve reused the nylon washers without issue. Agee the stock white o-rings are junk. Not sure why. Glad it looks like you’ve found an alternative source for o-rings. I guaranty the stock o-rings on bottoms are all mucked up. Good luck. Ps I used a piece wood as a lever under the valve body to pry it up as I installed it so I could line up the holes to bolt it back into the frame. Valve body is very heavy. I’d say around 50# give or take.

 

[sodamo]

That’s good to hear, Joel. Would like a size/source for the nylon washers. Fortunately I had a couple extra, but I’ve also broken 2, so will have to be extra careful. Heavy indeed, last time I took it out, very frustrating getting it back in.

 

[JoelD]

The tricky part with nylon washers would be to get the thickness right. I bet you could fairly easily measure with a digital caliper. I’m at different house I’ll measure when back at the machine as I have a few spares.

 

[JoelD]

Sodamo, did you fix bottom o-rings?

 

[sodamo]

Not yet, Joel.
Have backhoe off tractor right now, but I hope to get to the valve this week.

 

[sodamo]

Anyone find the nylon washer replacement?

 

[VictorW]

Anyone find the nylon washer replacement?

You and JoelD mention the white o-rings, probably a polyurethane type, getting gummy. Mine have black, 2005 KB2375, and I assume a type of rubber rings that have held up well. I looked on the o-ring sites and haven't found the nylon back up washers yet. At least not in anything smaller like ours are. I need to take mine apart to get good dimensions. So still hunting for a place that has varied sizes to be able match up.

 

[sodamo]

Finally got opportunity to work on valve. Changed out the lower O rings.
They all looked like this or worse. These are the urethane rings.


I was careful and was able to reuse the nylon washers.
Anyone who has done this, is this it or do I need to replace something else?

Didn’t get chance to remount and test, maybe tomorrow.

 

[VictorW]

The o-ring is the only seal with the nylon washer to back up the o-ring and possibly work as a debris wiper for the spool shaft. When I had to work on mine, I had top and bottom both apart and was able to remove the spool and check for any scaring that may tear up the o-ring. I would've polished with 1000 or higher sandpaper but wasn't needed. Your valve blocks have some rust on the outside. I sprayed mine down with fluid film which has worked well. Not sure why they used the urethane washers when they're not made for this type of application. You should be good to go with the black rubber o-rings. I'm still looking for the nylon washers. I found everything but the right ones.