I'd be inclined to think that since there isn't noise the pump isn't cracked or anything. If pieces were loose it would sound like it when you let the clutch out.
Sounds like it is running into the cavity around the pump. Could be anything from the seals to a cracked pump. Start by taking out each of the pipes that go into the pump. Even if they don't have hoses hooked up pull them and check them. I believe there are three total unless someone has gotten crafty. They should be regular black pipe with elbows but have springs on them (if they haven't been removed). If it is a large leak I would lean toward that cause. When you are pulling the lever it is pumping out into the tractor instead of through the hose.
If those all check out you don't have any choice but to drop the pump and see what is going on. Too bad it leaks all of the time as that puts the machine out of commission.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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