Posted by 2510Paul on May 18, 2019 at 18:27:06 from (184.97.40.156):
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?
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