I did some more work on the neighbors mower, it didn't have the pump pressure it should. So I did some more research, found that the pump corp headquarters are in the same state as me. Gave them a call (Sauer Danfoss), talked to tech support. So he sent me the parts breakdown with part numbers, very helpful when you want to shop around for parts. All said and done, I replaced the thrust plate, hand lapped everything in, cleaned and resealed. Presto, works good. The hand lapping is something I hadn't done before. I bought a piece of plate glass, used new parts solvent as my coolant/lube and 1500 wet/dry sandpaper. sanded by doing figure 8's. Oh, forgot, used the wife's cookie sheet with a piece of plywood in the sheet and the glass sitting on top of the wood, then filled with solvent. Anyways it worked. Attached the parts breakdown for a Sunstrand 15-2174 pump.
Also found out that a lot of the internal pieces for the pump are the same, meaning 15 and 15U have the same rotating group. How I found this out was by asking the question to tech support/field rep on if I could use a rotating group out of a 15U for my 15 series pump, he said they were the same. The 15 series cylinder block kit, 3103136 went into a lot of different lawnmowers and commercial grade lawn tractors. Such as for IH Cub Cadet the part number would be 405178R93 (listed for $861.64). For a Onan or Kubota the part number would be a 21-004(old listing number of 21-029) (listed for $1085.76). So I bought one thinking that I might need it because that's what I heard failed on these. Didn't end up needing it. So if someone needs one, let me know. I have tried to sell it on ebay, it's New Old Stock, would be a great way to make a tired pump happy I would bet.
