This is a Young PowerTech YMSY hydraulic motor for a PTO drive. This could be used on the aux hydraulic system of a Skid Steer tractor to drive the PTO shaft output to run a 7-8 ft mower deck or post hole auger. The output shaft is 1-3/8 inch 6 spline with groove retainer ring ( normal farm tractor size).
I just put together a Detroit 353 power unit with a 4 " Marlow pump . I disassembled the pump and replaced the bearings . the seal is obsolete and hard to replace .
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