Calling SVCummins

Recall the Case-IH 145 plow. Also recall the plow roll-over does not stay against the stops. It seems to leak back. SV, you seem familiar with this system.

I had the JD 4250 SCV valves leak checked and re-built. Yes, they didn't hold pressure but they were not terrible. I also am resealing the plow cylinder. The seals did not look bad except the dust seal on the shaft, it fell apart. Now, what to do about what I believe to be the pilot-to-open double check valve on the roll-over cylinder.

SV, you said you had eliminated this device. I think I understand why they put this device in, but if the tractor SCV's are good I fail to see why it is needed. As a matter a fact it provides another possible leak path. Before I pulled it out I wanted to check my logic. Does this all make sense?

To my knowledge my JD 4200 roll-over plow does not have this device, just the rollover valve that reverses the cylinder to complete the roll-over with one move of the SCV lever. On my JD 4200, the plow is now and has always remained tight against the roll-over stops, both before and after I re-built the tractor SCV's.

So what do you think? Should I try it without the pilot-to-open double check valve? Does my logic hold water (oil). Anyone else care to comment?

Thanks.

Paul

I have not used that exact plow but have used the pilot to release valves and they can easily cause the trouble your having. I would remove it and try it.

Throw it away it?s just a bandaid you don?t need . Sell it to someone who has a case or international

As said in your post a while back, The valve needs a pressure differential on each side of it to lock. Your JD closed center system has no differential so the pilot valve is floating and not closing off flow in either direction, and is serving no useful purpose.
Loren