Here is some more information. The pump is a Webster Electric 3HCS-2R. The oil that I am using is the Wal-Mart (I'll take my lumps now) Year Around Hydraulic Oil. Have no idea on the weight. Looks almost clear, like a mineral oil. The noise seems to get worse when the unit warms up. The breather for the reservoir is on a 4" long standpipe, but the actual breather hole is 1/4" diameter and is not plugged. If the reservoir is full, oil will come out the breather. The reservoir outlet (3/4") is near the top of the reservoir, and there is no filter. As I recall, there is an elbow inside the reservoir that turns down for the suction line. The hydraulic valve is a Gresen. From the layout of the system, it must be an open center system. The tractor is a 3-gear 70 (1940), but the noise has nothing to do with the timing gears. I am in the process of installing a Horn loader with Sears & Roebuck single-acting cylinders on this tractor. It looks like I will have to get some additional reservoir capacity, since the volume of the cylinders appears to be more than the volume of the reservoir.
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