A4VSO500LR2G/30L-PPB13N00 Original imported Rexroth piston pump hydraulic system motor

💡 LR2G Control Explanation:​ LR2G combines Load Sensing (LS) + Pressure Limiting (DR)​ function with an added pilot port (X)​ for remote pressure setting override, similar to DRG but on an LS-capable control. The pump maintains the LS differential (∆p set by internal spring/orifice "2") relative to the LS signal, and has a max pressure limiter — both the LS ∆p and/or the max pressure can be influenced/overridden by pilot pressure at port X. This offers flexibility for systems needing both LS efficiency and remote pressure control.

FAQ — Frequently Asked Questions

Q1: What does "LR2G" control mean and how is it different from LR2 or DFR?

A:​

• LR2​ = Load Sensing + Pressure Limiter, purely hydraulic LS from valve bank — local mechanical adjustment of max pressure only.

• LR2G​ = Same LS+DR function PLUS a pilot port (X)​ allowing remote modulation/override of the pressure setting​ via external pilot signal (like DRG adds to DR).

• DFR​ = LS+DR with internal spring — no remote pilot port (unless specified otherwise in some sub-variants).

  LR2G is used when you want LS pump behavior and​ the ability to change the pressure setpoint remotely (e.g., by a proportional reducing valve).

Q2: The rotation code is "L" (30L) — what does that mean practically?

A:​ "L" = Counter-Clockwise​ when viewed from the drive shaft end. This is the opposite of the more common "R" (Clockwise). The pump must be driven in this direction​ — running it in reverse will cause immediate failure due to loss of lubrication and improper suction. Always verify your prime mover / coupling rotates counter-clockwise from the shaft side.

Q3: What are the suction (inlet) requirements for this 500 cc pump?

A:​ With 500 cm³/rev displacement, inlet conditions are critical:

• At 1200 rpm, inlet absolute pressure should be ≥ 1.0–1.2 bar​ (boost pump strongly recommended for sustained high-speed operation).

• For speeds >1200 rpm, a dedicated charge pump / supercharge circuit​ is essential to prevent cavitation.

• Use generously sized inlet piping (≥ DN80/100), minimize elbows/restrictions, and fit a 149 µm (100 mesh) suction strainer.

Q4: Can I mount an auxiliary pump (gear pump) on the rear?

A:​ No.​ The suffix N00​ indicates no through-drive shaft. The rear of the pump housing is blanked. If you need a through-drive for a charge / pilot gear pump, select a version with a through-drive code such as K01, K02, etc.

Q5: How should the case drain (L port) be handled?

A:​ Connect one case drain port​ directly to the tank with a dedicated line — zero backpressure​ (max 0.5 bar). The second drain port must be plugged. Route the drain line to above the tank oil level or provide a loop to prevent air ingestion. A blocked or pressurized drain = shaft seal failure.