Frequently Asked Questions (FAQ)

Q1: Is this a pump or a motor?

A:​ This is a fixed displacement hydraulic pump. It is designed to be driven by an external prime mover (e.g., electric motor or engine) to generate flow in an open circuit. While A2FO units can sometimes operate as motors, this specific configuration (61R-VPB06) is primarily intended for pump duty.

Q2: What is the key difference between the "VPB06" and the previous "PBB06" model?

A:​ The main differences are the seal material​ and shaft type:

• V (Seals):​ Indicates FKM (Viton)​ seals, which offer superior chemical and temperature resistance compared to the standard NBR (P) seals found in the PBB06 variant.

• P (Shaft):​ Indicates a tapered shaft​ (1:5) instead of a splined shaft. This requires a different coupling or pulley arrangement.

Q3: What is the maximum system pressure I can run?

A:​ The pump is rated for a continuous nominal pressure of 350-400 bar. It can handle short-term peak pressures up to 450 bar, but the total duration of peak pressure operation should be limited to ensure bearing and seal longevity.

Q4: Does this pump require a case drain line?

A:​ Yes.​ The "L" port is a case drain and must be connected directly to the tank​ with minimal backpressure (typically max 2 bar). This is critical to prevent shaft seal failure by relieving internal case pressure from internal leakage.

Q5: What type of hydraulic fluid is recommended?

A:​ The pump is compatible with standard mineral oils (HL, HLP), biodegradable oils (HETG, HEES), and fire-resistant fluids (HFDU). The use of FKM (Viton) seals provides broader fluid compatibility compared to standard NBR seals.