Rexroth A4VSO250 Variable Piston Pump 280 Bar Max Pressure

A4VSO250LR2G/22R-VPB25N00 A4VSO250LR2G/22R-VZB13N00 A4VSO355DR/22R-PZB13N00
A4VSO180EO1/22R-VZB13N00 A4VSO180EO1/22R-VPB25N00 Variable piston pump German industrial high-pressure A4VSO250 Rexroth

FAQ:

Operation & Fluid Management

Q5: What hydraulic oil should I use, and what is the optimal viscosity?

• Oil Types: Recommended fluids include mineral oils (RC 90220), environmentally friendly fluids (RC 90221), and HF fluids (HFA, HFB, HFC - check seal compatibility, typically FKM for HFD; RC 90223). Specify the fluid type when ordering.

• Viscosity Range: The optimal operating viscosity range (at operating temperature) is 16 to 36 mm²/s. Absolute limits are:

◦ Minimum: 10 mm²/s (short-term, max. case drain temp 90°C)

◦ Maximum: 1000 mm²/s (short-term, cold start).

• Selection: Select a viscosity grade (e.g., VG 46, VG 68) so that the viscosity at the operating temperature (typically tank temperature in open circuits) falls within the optimal range. Generally, opting for a higher viscosity grade is advised.

Q6: What are the fluid cleanliness requirements?

To ensure reliable operation and long service life, the oil cleanliness should be at least NAS 1638 Class 9 or ISO/DIS 4406 18/15.

Q7: Why does my pump get overheated?

Common causes for excessive heating include:

• Internal Leakage: Excessive internal leakage within the pump components converts hydraulic energy to heat.

• Mechanical Friction: Dry or semi-dry friction due to worn parts or inadequate lubrication generates heat.

• Fluid Friction: Inadequate tank capacity or cooling, causing the system to overheat.

• Clogged Return Line Filter: A blocked return filter creates high backpressure, leading to increased temperature.

• Low Oil Level: Insufficient oil in the reservoir reduces cooling capacity.

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