Backhoe Backhoe Control Valve

[sodamo]

KB2375
Control valve Nimco CV-556 (I think)

Anyone know of a replacement for this valve?
Or a description of what to look for in a replacement.

 

[K5lwq]

What is wrong with the current valve? Sourcing a good replacement can be tough. Might be easer to repair the one you have.

Just with a quick look, that valve is a 6 section valve, one float spool and 5 double acting.

It has load checks on both A and B side of each spool.

It is rated @ 24 GPM and has a internal leakage of about 3 cc per minute.

It has 2 anti cavitation valves.

Main relief is set up to 4650PSI and Port relief is up to 4700PSI. (you need to know what your system pressure is to order the proper relief setting)

Knowing exactly what you need before you order is extremely important!

 

[sodamo]

Thanks, great info
Leaking again. I replaced some O rings etc a few years back, started leaking again about year later, but slowly enough I just kept adding fluid to finish project. Hadn’t used for a couple years and now leaking terribly.
I’ll take it off and look and probably look to repair again if I can source parts. Doubt it could be serviced locally but would consider it.

 

[K5lwq]

Michigan Iron has a parts break down on their website for this valve and you can order parts from them. Going thru a Kioti dealer is probably more expensive but might be easier. Good luck!

 

[sodamo]

Thanks.
Couldn’t find old email from last time. Changed email providers.

 

[VictorW]

I have the same control on my KB2375. The bottom o-rings and the bottom of the spools are protected by the valve caps. The top of the spools aren't protected well. Only those rubber boots on the control levers to shed off anything. If there is any rust on the top end of the spools, it will shred those 0-rings. When I'm done using mine for a while, I pull up those boots and spray the top of the valve blocks and spools with fluid film. It's worked for 12 years so far.

If you do look for another control, make sure it's an open center control. Surplus center has this one which may work. 6 Spool Hydraulic Valve w/Joysticks Prince SV | Directional Control Valves | Hydraulic Valves | Hydraulics | www.surpluscenter.com They are pretty knowledgeable so if you give them a call, they can help you. You can see by the price, it may be less expensive to rebuild yours. Michigan Iron would be a good place. Robert there in parts has always been very helpful and knowledgeable. Without having new o-rings to measure, I have no idea what would fit correctly.

 

[sodamo]

Thanks Victor. You’re probably the most knowledgeable about this unit.

 

[sodamo]

My response from Robert:

We bring bad news. The part you need is seal kit number BC01-1000-P for each spool. This seal kit is no longer available from KIOTI due to discontinuation at Nimco. The seals can be found at local hydraulic shops. We are waiting to hear back from KIOTI for technical information you can use to match up both the o-ring and the backer washer.

If we can get some information from them, we will pass it along.

Sorry, but this is the best information we have at this time.

Bob

 

[VictorW]

My response from Robert:

We bring bad news. The part you need is seal kit number BC01-1000-P for each spool. This seal kit is no longer available from KIOTI due to discontinuation at Nimco. The seals can be found at local hydraulic shops. We are waiting to hear back from KIOTI for technical information you can use to match up both the o-ring and the backer washer.

If we can get some information from them, we will pass it along.

Sorry, but this is the best information we have at this time.

Bob

Thank you for posting that information. I realize, at least my bh, is 13 years old but these are just rubber o-rings and the nylon backup washer. You'd think Kioti could keep something in stock to match up. They are more like a wear item that may need to be replaced and not that costly to have in their warehouse.

If Robert ever gives you some dimensions on those parts, please let us know. I guess until then, it's measuring and trying to find a workable o-ring. I'll be in the same boat if mine fail.

Thanks again

 

[sodamo]

Sad indeed.
Kioti or Nimco should publish the info.
I think there was another post where someone found a substitute. Maybe they will post and enlighten us.

 

[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.