A4VSO250EO2/30L-PPB25N00 Rexroth Germany plunger pump loader mining oil field
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product Description
A4VSO250EO2/30L-PPB25N00 Rexroth Germany Plunger Pump
Product Specifications
| Parameter | Specification |
|---|---|
| Model | A4VSO250EO2/30L-PPB25N00 |
| Brand / Origin | Rexroth / Germany |
| Type | Swashplate-type axial piston variable pump (Open circuit) |
| Displacement (Vg max) | 250 cm³/rev |
| Control Type | 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 |
| 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 |
Applications
- Mining: Mine-site centralized hydraulic power stations (HPU), crusher wedge/toggle clamping systems, roof support test benches, conveyor tensioning systems
- Oil Field: Skid-mounted well-service HPUs, BOP test rigs, drawworks brake/clutch hydraulic packs
- 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)
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.
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Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun