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Final report. The o-rings and backup rings arrived today and they fit nicely. I put everything back together after first marking each check valve with a line across the outside surface that aligns with the bore that the retaining bolt has to go through. That way, once I had pushed them all...

I spent some time measuring the bore and the groove diameters on these check valves. Interestingly the bore is stepped, 1.126" diameter at the mouth, 1.092" diameter halfway in where the ports and the first o-ring are, and 1.060" diameter towards the back where the 2nd o-ring is. The first...

Thanks a lot, gang. Removing the tie bolt did indeed release the check valves. They slide right out. There's even a little spring and irreplaceable square steel block in the back of the valve that you can lose when you pull out the valve. Here's what the tie bolt looks like when it's halfway...

Thanks, True, I'll report back here if/when I get it apart. I agree on replacing o-rings in all of them.

Thanks, Zebra, that almost explains it. I see an O-ring and backup ring right near the outside that are surely what's leaking in my case. But how does one get that check valve out of the whole valve block? I have a sinking feeling that I'll have to take the stack of valves apart and access...

I'm nursing along an old 93A backhoe attachment for my JD 450 track loader. Of course it leaks hydraulic fluid from multiple locations but the worst culprit are some little round things located on one or two of the control valves between the two hose connections. this photo shows the overall...

I've got a JD 450 track loader that runs just fine when first started but, after a while, starts running somewhat ragged. If it was a gas engine, I'd say it was running too rich, causing it to miss occasionally, etc. But it's a diesel, the 202 cu in 4-cylinder engine that JD used in these...