Not a dual-pump in one housing. It has two totally separate hydraulic pumps. One is a Cessna gear pump driven off the front crankshaft pulley. The other is mounted directly on the engine and gear-driven. Basically, what IH did was tap into the tractor power-steering circuit to power the swing in the hoe - but nothing else in the hoe.
In regard to seals leaking in the valve spools - there aren't any. The spools in this thing seal like most do - by metal to metal contact. Rubber seals in the valve banks only stop leaks but don't hold any pressure. Certainly valve spools and bores can get scored and worn over item - but when that happens you get lots of leaking oil -not system malfunctions.
After the hoe gets hot, nothing in the hoe works properly. All functions get slow and weak. That includes little to no swing power even though that is on its own separate system. At first, since the machine is missing its hydraulic filter and has been run that way for a long time - I figured maybe both hydraulic pumps are simply worn out. But . . . if that was true, the front loader also should work lousy once hot - yet it works fine. Also, why does the hoe boom raise great when I jam on the swing lever? That one really has me baffled. It acts like it sends a rush of extra oil to the boom. (might do the same in other hoe functions, but I didn't experiment too much). This is why I'm calling this a "oddball" problem. And, to make it worse, I don't have it here in my shop. It's parked 750 miles away in northern Michigan, and I won't be back up until late summer. I'm trying to figure out what parts I should bring on the next trip. On this trip, I was in a hurry to get a new septic system in, so I nursed the hoe through the job. If I hadn't discovered the trick of jamming on the swing lever to raise the boom, I could not have finished. Once the hoe was hot, it could not raise the boom out of the hole with a full bucket of dirt (until I hit the swing, which I discovered by accident).
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