Excavator Pump Parts Rexroth Repair Kit A10VO63 Ball Guide R910979801 Excavator Spare Parts It is the swash plate mounting base. The swash plate attaches to the support, which pivots on the pivot shaft to change swash plate tilt angle. Full assembly order: Drive Shaft → Cylinder Block → Ball‑Guide → Set‑Plate → Piston Shoe → Swash Plate → Support Ⅱ. Core Functions Load & mount: Secures swash plate and bears heavy thrust loads from piston shoes. Pivot swing: Moves around pivot