A4VSO250EO1/30L-PPB25N00 Excavator parts, loader motor, Rexroth piston pump, Germany
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product Description
A4VSO250EO1/30L-PPB25N00 Excavator parts, loader motor, Rexroth piston pump, Germany
Product Specifications
| Model | A4VSO250EO1/30L-PPB25N00 |
| Brand / Origin | Rexroth / Germany |
| Type | Swashplate-type axial piston variable pump (Open circuit) |
| Displacement (Vg max) | 250 cm³/rev |
| Control Type | EO1 -- Electro-proportional displacement control (pump flow ∝ input command signal; min. pilot pressure ~20 bar) |
| Nominal Pressure | 350 bar (35 MPa) Continuous |
| Peak Pressure | 400 bar (40 MPa) Intermittent |
| Max. Speed (nₘₐₓ) | 1500 rpm @ Vg max |
| Theoretical Flow @ 1500 rpm | ≈ 375 L/min (n × Vg ÷ 1000) |
| Rotation Direction | L -- Counter-clockwise (viewed from shaft end) |
| Mounting Flange | ISO 3019-2 / Series 30, 4-bolt |
| Through-drive | Yes (PPB = through-drive capable; N00 = no auxiliary pump fitted) |
| Port Configuration | 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 |
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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)
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.
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Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun