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{"title":"Original Imported Rexroth Germany 28cc Displacement High Pressure Piston Pump","imgUrl":"https:\/\/img.chinax.com\/nimg\/3c\/31\/ce4468ef1718a9f6b74e4c9414a7-200x200-1\/original_imported_rexroth_germany_28cc_displacement_high_pressure_piston_pump_with_100_25_tested_great_performance_and_up_to_80_c2.jpg","attrs":{"Brand Name":"Rexroth","Model Number":"A2FO80\/61L-VQDN55 A2FO80\/61R-VQDN55 A2FO90\/61R-VUDN55 A2FO90\/61R-PBB05 A2FO90\/61L-PBB05","Certification":"ISO","Place of Origin":"Germany"}}
{"title":"German Rexroth Industrial Hydraulic Piston Pump with 12 Months Warranty 100%","imgUrl":"https:\/\/img.chinax.com\/nimg\/c5\/22\/7b29d922c10b11ac94ce0beec2ac-200x200-1\/german_rexroth_industrial_hydraulic_piston_pump_with_12_months_warranty_100_25_tested_great_performance_and_threaded_or_flanged_in.jpg","attrs":{"Brand Name":"Rexroth","Model Number":"A2FO90\/61R-PAB05 A2FO90\/61L-PAB05 A2FO90\/61R-PBB05 A2FO90\/61R-VBB05 A2FO90\/61R-VQDN55","Certification":"ISO","Place of Origin":"German"}}
{"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"}}
{"title":"German Rexroth ISO9001 Certified Piston Pump for Mobile and Industrial Hydraulic","imgUrl":"https:\/\/img.chinax.com\/nimg\/73\/0e\/c4fe575b539956cb89a167a3ff3d-200x200-1\/german_rexroth_iso9001_certified_piston_pump_for_mobile_and_industrial_hydraulic_systems_with_clockwise_or_counterclockwise_rotati.jpg","attrs":{"Brand Name":"Rexroth","Model Number":"A2FO107\/61R-NBD55 A2FO107\/61R-PPB05 A2FO107\/61R-VPB05 A2FO107\/61R-VSD55 A2FO107\/61L-VSD55","Certification":"ISO","Place of Origin":"German"}}
LR2 — Hydro-mechanical constant power (horsepower) control, follows a hyperbolic characteristic curve (P×Q = const). Adjustable starting point of power limiting via set screw.
LR2 — Constant power (horsepower) control, hyperbolic characteristic, mechanically adjustable start of power limiting
30 — Design Series 30
L — Counter‑clockwise rotation (viewed from shaft end)
PPB25N00
PP — Through‑drive capable, ISO 4‑bolt flange, metric keyed shaft
B25 — SAE flange side ports (P & T 90° apart), second pressure port B1 plugged
N00 — No auxiliary pump / no special option on through‑drive
Frequently Asked Questions
What does LR2 (constant power / horsepower control) do?
LR2 is a hydro-mechanical constant power controller. The pump automatically reduces its displacement (flow) as system pressure rises, so that the product of Pressure × Flow ≈ constant (Power = const) — following a hyperbolic curve. This prevents the prime mover (electric motor / engine) from being overloaded. The starting point of power limiting is adjustable via a mechanical set screw on the LR2 controller. LR2 is purely mechanical/hydraulic — no electronics required.
How is LR2 different from DR (pressure control) or DFR (load-sensing)?
DR: Maintains constant pressure; pump strokes to near-zero when pressure setpoint is reached.
DFR / DFR1: Load-sensing + pressure limiting — adjusts flow to match demand.
LR2: Does NOT hold constant pressure; it limits total absorbed power. At low pressure the pump can deliver full flow; as pressure climbs the swash plate is mechanically forced back to keep P×Q below the set power limit. If system pressure is low, pump stays at full displacement.
Can I mount a second pump on the back?
Yes. The PPB code indicates through‑drive capability. You can flange-mount another A4VSO pump (same or smaller size) or a gear pump on the rear to form a tandem combination. N00 = no auxiliary gear pump pre-fitted, through-drive shaft is present.
What are critical installation points for LR2 pumps?
Case Drain: Plumb directly to tank, backpressure ≤ 1.5-2 bar. Never tee into main return.
Suction Line: Keep short & large-diameter; ensure absolute inlet pressure ≥ 0.8 bar to avoid cavitation. Use 100 µm suction strainer.
Rotation Check: "L" = counter‑clockwise when viewed from shaft end — verify prime mover direction before coupling.
LR2 Adjustment: Set the power-limiting screw so that P×Q at max pressure does not exceed motor rated power (allow ~10% margin for losses).
Bleed: Fill case and suction with oil and vent before first start-up.
Is a system relief valve still required with LR2?
Yes, absolutely. LR2 limits power but has no precise pressure cut-off function — it can allow pressure to rise above safe levels if flow demand drops to near zero and the control is misadjusted. A system safety relief valve (e.g. DB type, set above max working pressure + margin) is mandatory.
What oil cleanliness is required?
Maintain hydraulic oil at ISO 4406 18/16/13 (NAS 1638 Class 8 -9) minimum, using a return-line filter with β₁₀ ≥ 200 (10 µm nominal). Particle contamination is the leading cause of premature A4VSO pump failure.
What is the PPB25 port configuration?
B25 = SAE flange side ports with pressure port (B) and tank port (S) 90° apart, plus a second pressure port (B1) on the opposite side of B, normally plugged with a SAE flange blank. This allows cascade loading or superimposed signals in multi-pump systems.
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...
