You would probably have to go to a dealer to find a flow rater. All the couplings, valve, and guage can cost some bucks just to do a pressure test. If the rest works, I'd look to the piston in the valve sticking, a cylinder piston leaking by, or a problem with a hose/fitting.
As I recall, the valve setups on some have a pressure relief valve in them that could be plugged and leaking by. Look for any hex head cap that looks like a bolt head on the valve assembly. Most likely a spring and ball or one piece relief valve. IH is good for putting them on every single thing. Those assemblies with 3 valves together would probably have one for each valve with an internal passage to the return.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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