Excavator Pump Parts Rexroth A7VO107 Center Pin Disk Type R909410289 Excavator Spare Parts

Excavator Pump Parts Rexroth A7VO107 Center Pin Disk Type R909410289 Excavator Spare Parts

Main Functions

Centering and positioning: Provides radial positioning for the cylinder block, ensures coaxiality between the cylinder block and valve plate, and prevents offset of the cylinder block and uneven wear on the valve plate.

Radial force bearing: Absorbs radial offset force generated during cylinder block operation and limits cylinder block wobbling.

Auxiliary centering: Works with springs to press the cylinder block tightly against the valve plate, maintain sealing performance and avoid high‑low pressure oil cross‑leakage.

Rotation guidance: The cylinder block rotates around the center pin to ensure stable operation of the piston assembly.

Failure Consequences

Worn or scored center pin → eccentric wobble of cylinder block → rapid wear on end faces of valve plate and cylinder block, increased internal leakage, insufficient pump pressure, abnormal noise and overheating.

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