I had my 1572 have the same condition with the hydro shaft becoming egg-shaped. It really did not really show up until I was randomly loosing sealing ability of the front seal and loosing hytran. As I was digging into it, I found the bronze self centering bearing at the pump end of the driveshaft was worn out and was allowing the disconnect clutch to rotate in an off-center out of balance condition. I believe this is what led to the problem with the hydro pump shaft becoming egg-shaped.
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1989 - Cub Cadet 1772
1987 - Cub Cadet 1572 w/Rear PTO & Cat. 0
38" Lawn Sweeper #196483
42" L42 (Bush Hog) Rotary Cutter # 190349
45" 2-Stage Snowblower # 196364
48" Haban Rotortiller Rear PTO Driven #190356
54" SnowBlade with hydraulic Angle #196376
60" Haban Mowing Deck #196374
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