Allyn, Sounds like either the bolt broke on one of the spools or the outer portion of the spool broke in two. I have seen both of these occur on these systems. The pump would not cause the system to drop the load.As for power steering for your tractor, the complete system from a 335 or 445 utility will have all the correct parts. A 445 universal's parts will be correct except for the lines will be too long by the transmission but you can shorten them. A system from an early Jet Star or early 4 Star will work (again the 4 Star's will be too long). Later 4 Stars & Jet Stars have a different Control valve on them, but they will work. All of the hydraulic pumps I have seen on tractors without power steering have had the correct holes for the priority valve in them. They just didn't have the valve or spring and had a special plug in the opening. My one 335 has had a 5 Star or M5 pump on it for 30 years. The following pumps will work: 335, 445, 5 Star, early M5, early 4 Star, early Jet Star. The difference is that the bigger tractors have a thicker center plate and gears to pump more volume. If I remember correctly 335 is 3/4", 445, Jet Star & 4 Star are 1" and 5 Star & M5 are 1-1/4" John
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