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{"title":"A4VSO71EO1\/30L-PPB13N00 A4VSO71LR2\/30L-PPB25N00 German piston bar axial","imgUrl":"https:\/\/img.chinax.com\/nimg\/35\/dd\/d32d0532f1879d4c55968ff91d80-200x200-1\/a4vso71eo1_2f30l_ppb13n00_a4vso71lr2_2f30l_ppb25n00_german_piston_bar_axial_excavator_motor_rexroth_brand_new_original_warranty_fo.jpg","attrs":{"Brand Name":"Rexroth","Model Number":"A4VSO71EO1\/30L-PPB13N00 A4VSO71LR2\/30L-PPB25N00","Certification":"ISO9001","Place of Origin":"German"}}
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LR2G -- Hydraulic Load Sensing (LS) + Pressure Limiter with Remote Pilot Option
Mechanical Interface
Shaft Type
Parallel Key Shaft (DIN 6885)
Rotation Direction
Counter-Clockwise (L) -- viewed from shaft end
Mounting Flange
ISO 3019-2 (4-bolt, metric)
Port Configuration
PPB13: SAE flanged ports, metric screws, 13 series port plate
Through Drive
N00: No through-drive capability
Sealing & Media
Seal Material
NBR (Standard, code P implied)
Compatible Fluids
Mineral oils (HL/HLP), HFC (Water Glycol with derating)
Weight (approx.)
~240 kg
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.
Frequently Asked Questions
Q1: What does "LR2G" control mean and how is it different from LR2 or DFR?
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?
"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?
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?
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?
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
