Rexroth A4VSO125 Variable Piston Pump 1500-2700 rpm Cast Iron

A4VSO125DFR/22R-VPB25N00 A4VSO125DFR/22R-VZB13N00 A4VSO125DFR/22R-PZB13N00
A4VSO125DFR/22R-VPB13N00 A4VSO125DFR/22R-PPB13N00 Industrial pump Rexroth Germany A4VSO125 variable high-pressure piston pump

FAQ:

• Suction Line: Use a flexible connection for the suction line. The use of a suction line filter is generally not recommended; a pressure line filter is preferred.

Q4: What are the recommended installation positions?

The pump can be installed in various orientations (horizontal or vertical). For vertical installation with the shaft pointing upwards, external bearing flushing is strongly recommended to ensure adequate lubrication for the front bearing and shaft seal.

3. 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.

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