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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"}}
{"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"}}
EO2 - Electro-proportional displacement control, high pilot pressure type Min. pilot pressure typically 50-100 bar; pump flow proportional to electric command signal via external proportional amplifier + LVDT feedback
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
Applications
Mining: Mine-site centralized hydraulic power stations (HPU), crusher wedge/toggle clamping systems, roof support test benches, conveyor tensioning systems
Construction Machinery Manufacturing / Test: Loader & excavator factory test stands for validating implement valves
Metallurgy: Steel rolling mill auxiliaries, billet pushers, cooling bed clamps
Plastics / Die-Casting: Large injection molding machines, die-casting clamp/hold-down circuits
Marine / Offshore: Deck machinery power packs (open circuit)
Model Code Breakdown
A4VSO - Axial piston variable pump, open circuit
250 - Displacement 250 cm³/rev
EO2 - Electro-proportional displacement control, high pilot pressure type (min. ~50-100 bar pilot)
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)
Frequently Asked Questions
What does EO2 (electro-proportional displacement) control do?
EO2 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 external amplifier). The pump has an onboard LVDT position feedback. EO2 requires a higher pilot pressure (min. ~50-100 bar for Size 250) vs EO1 (~20 bar). It provides no pressure limiting - a separate system relief valve is mandatory.
What is the difference between EO2 and EO1?
Both are electric proportional displacement controls with LVDT feedback. Main difference is pilot pressure requirement:
EO1: Min. pilot ~20 bar (Sizes 40-250)
EO2: Min. pilot ~50-100 bar (Sizes 250/355/500+, offers higher control stiffness)
If replacing EO1 with EO2, ensure your system can supply adequate pilot pressure.
Can I mount a second pump on the back?
Yes. The PPB code = through-drive capable. An A4VSO (same/smaller) or gear pump can be flange-mounted to the rear. N00 = no auxiliary pump pre-fitted, through-drive shaft 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 (EO2): Supply pilot port with clean oil ≥ specified min. (typically 50-100 bar). Insufficient pilot → swash plate won't stroke
Rotation Check: "L" = counter-clockwise from shaft end - verify prime mover direction before coupling
Bleed: Fill case and suction with oil, vent before first start-up
Does EO2 need a separate amplifier?
Yes. Pump has solenoid + 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. EO2 controls flow/displacement only - install a properly sized system safety relief valve (e.g. DB type) set above max working pressure + ~10-15% margin.
What oil cleanliness is required?
Maintain ISO 4406 18/16/13 (NAS 1638 Class 8-9) minimum using return-line filter β₁₀ ≥ 200 (10 µm nominal). Contamination is the #1 cause of A4VSO premature wear.
Is this the main pump for a wheel loader or excavator?
No. A4VSO is an industrial open-circuit pump. Mobile wheel loaders and excavators typically use A4VG (closed circuit), A11VO (open axial), or A2FO (fixed) as travel/main pumps. A4VSO may be used on loader/excavator factory test benches or auxiliary stationary HPUs, not as a direct OEM travel pump replacement.
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...
