Backhoe Backhoe Control Valve

[sodamo]

Spent the day working on my Nimco CV 556. Sadly, not a good report.
I found an envelope of o rings, etc fro Michigan Iron from last time I repaired. Apparently they don’t age well and my valves still leak. Still haven’t found a source, Kioti simply referred me to dealers and NimcoUSA doesn’t even have the decency to acknowledge my emails.
Have contacted Surplus Center in regards to valve Victor linked. Maybe it is a drop in replacement?
Backhoe is virtually worthless without functioning valve and I have 56ft of trench that needs digging to replace broken propane line.

Anybody find alternatives yet?

 

[JoelD]

Ironic the timing on this post. I just replaced all the spool valve o-rings on my backhoe last weekend. I contacted Nimco a few years back and got the dimensions of the orings. Not sure if same as yours. I’ll be at my machine later today and I’ll post the dimension of the thin black oring at the top of the spool valve under the caps. The white orings which turn to jelly every few years are 15.95id 20.45od. I found 5/8 x 13/16 = 15.875 x 20.6375 to be very common size and are almost exact matches and seal up well enough to work for me so far. I used 70 durometer Viton orings, Bunton would be better for super cold climate but I don’t use backhoe in winter. Dealer was charging $20 per oring I paid fraction. The original white orings are junk. Needed to find alternative. Also, you can bring your valve body to a hydraulics place and they can rebuild for you I’m sure.

 

[JoelD]

If different from mine I’m sure you can get dimensions from nimco just be persistent took me a bunch of tries with diagram to get the information I needed.

 

[JoelD]

The nylon wiper washers hold up well and I reused but I’m sure you can find those dimensions as well should you need new.

 

[JoelD]

Standard Source Inc is the company I contacted to find the original o-ring dimensions. You may even be able to get originals still from them. The entire kit for entire valve body would’ve been $230. I did not purchase due to cost and more importantly because originals kept failing every couple of years.

 

[JoelD]

Here are the small o-rings

 

[JoelD]

Instead of $8 per I paid like $5 for 25. The entire process is ridiculous if you ask me.

 

[JoelD]

Finally you can get an oring gauge to measure your old o-rings.

 

[wdchyd]

If your Nimco spool measures 16mm dia, those seals are easily obtained by your local hyd shop......well at least mine has them....:laughing:

 

[sodamo]

Thanks guys.
Once my head clears from this bug/flu I’ll try to order.