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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"}}
PPB25 -- SAE flange side ports (P & T 90° apart), second pressure port B1 opposite B plugged with SAE flange blank
Seal Material
FKM (Viton, standard for mineral oil HLP)
Case Drain
Two case drain ports -- must be routed to tank < 2 bar backpressure
Recommended Viscosity
16 - 100 mm²/s (ISO VG 46 @ operating temp)
Cleanliness Requirement
ISO 4406 18/16/13 (NAS 1638 Class 8-9)
Net Weight (Approx.)
≈ 148 kg (dry, excl. coupling)
Package / Condition
Original factory wooden crate, new unused, German import
Salable / Supply Region
Global -- Available via Rexroth authorized industrial hydraulics distributors
Related Models
A4VSO250DRG/30R-PKD63N00-SO91
A4VSO250DRG/30R-PPB13N00
A4VSO250DRG/30R-PPB13N00E
A4VSO250DRG/30R-PPB25N00
A4VSO250DRG/30R-PSD63K24-SO859
A4VSO250DRG/30R-VKD63N00
A4VSO250DRG/30R-VKD75U99E-SO206
A4VSO250DRG/30R-VSD75U18E
A4VSO250DRG/30R-VSD75U99E
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A4VSO250DRGNT/30R-PKD63N00E
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A4VSO250DRN/30R-PKD63N00E
A4VSO250DS1/30W-VKD63T000N
A4VSO250DS1/30W-VKD63T020NE
A4VSO250EM1036/30R-PPB13N00-SO221
A4VSO250EO1/30R-FKD63K08E
A4VSO250EO1/30R-PKD63K02
A4VSO250EO1/30R-PKD63K02E
A4VSO250EO1/30R-PKD63K03
A4VSO250EO1/30R-PKD63K08
A4VSO250EO1/30R-PKD63K08E
A4VSO250EO1/30R-PKD63N00
A4VSO250EO1/30R-PKD63N00E
A4VSO250EO1/30R-PKD75K24E
A4VSO250EO1/30R-PKD75U99E
A4VSO250EO1/30R-VKD63N00E
A4VSO250EO2/30R-FKD63K08E
A4VSO250EO2/30R-PZB13N00
A4VSO250EO2/30R-VKD63K16E
A4VSO250EO2/30R-VKD63K17E
A4VSO250EO2/30R-VKD63K18
A4VSO250EO2/30R-VKD63N00
A4VSO250EO2/30R-VSD63K16
Model Code Breakdown
A4VSO -- Axial piston variable pump, open circuit
250 -- Displacement 250 cm³/rev
EO1 -- Electro-proportional displacement control (low pilot pressure type, min. ~20 bar)
30 -- Design Series 30
L -- Counter-clockwise rotation (viewed from shaft end)
PPB25N00 -- ISO flange w/ through-drive (PP), SAE side ports + second pressure port B1 plugged (B25), no auxiliary pump (N00)
Typical Application Scenarios
Although sometimes listed alongside excavator/loader parts in aftermarket catalogs, the A4VSO series is an industrial open-circuit pump and is primarily used in:
Industrial Hydraulic Power Units (HPU) -- Centralized pump stations supplying multiple press or machine circuits with electronically controlled flow
Hydraulic Presses -- For programmable ram speed control via EO1 + external proportional amplifier
Plastic Injection Molding Machines -- As the main or auxiliary pump in high-precision flow control loops
Die-Casting / Forging Machinery -- Where remote flow adjustment and load-adaptive operation are required
Steel & Rolling Mill Auxiliaries -- Clamping, balancing, or lubrication systems needing variable flow
Marine / Offshore Deck Equipment -- Winch or crane power packs (open circuit, not travel drives)
Test Benches -- Calibrated flow generation for component testing
Note: Mobile excavators and wheel loaders typically use A4VG (closed circuit), A11VO (axial open), or A2FO (fixed displacement) as main pumps. A4VSO is not a direct drop-in replacement for excavator main pumps unless the machine was custom-engineered with an open-circuit industrial HPU.
Frequently Asked Questions
What does EO1 (electro-proportional displacement) control do?
EO1 varies the pump's swash plate angle -- and therefore output flow -- in proportion to an external electrical command signal (typically ±10 V, 4-20 mA, or PWM via an external amplifier). The pump has an onboard LVDT for position feedback. EO1 provides no pressure limiting; system pressure is load-determined. A separate relief valve is mandatory.
What is the difference between EO1 and EO2?
EO1: Min. pilot pressure ~20 bar (suitable for Size 40-250)
EO2: Min. pilot pressure ~50-100 bar (typically for Size 355/500+ or high stiffness requirement)
For A4VSO250, EO1 is the standard electro-proportional option.
Can I mount a second pump on the back?
Yes. The PPB code indicates through-drive capability. An A4VSO (same/smaller) or gear pump can be flange-mounted to the rear. N00 = no auxiliary pump pre-fitted, through-drive shaft is present.
What are critical installation requirements?
Case Drain: Plumb directly to tank, backpressure ≤ 1.5-2 bar. Never tee into main return
Suction Line: Short & large-diameter; absolute inlet pressure ≥ 0.8 bar. Use 100 µm suction strainer
Pilot Pressure (EO1): Supply pilot oil ≥ 20 bar to the EO1 pilot port (usually X or pilot supply port)
Rotation Check: "L" = counter-clockwise from shaft end -- verify prime mover direction
Bleed: Fill case and suction with oil, vent before first start-up
Does EO1 need a separate amplifier?
Yes. The pump has the solenoid and LVDT but requires an external proportional amplifier (e.g. Rexroth VT 5035-1X or PLC analog output with current driver). Amplifier ordered separately.
Is a system relief valve still required?
Yes, absolutely. EO1 controls flow only -- install a properly sized system safety relief valve (e.g. DB type) set above max working pressure + margin (~10-15%).
What oil cleanliness is required?
Maintain ISO 4406 18/16/13 (NAS 1638 Class 8-9) minimum using a return-line filter β₁₀ ≥ 200 (10 µm nominal). Contamination is the #1 cause of A4VSO premature wear.
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...
