Rexroth A8VO107LA1H2/61R1-NZG05K610 Variable Axial Piston Pump (Part No. R902040432)
1. Product Overview
The A8VO is a bent-axis design axial piston variable double pump by Bosch Rexroth, built for hydrostatic drives in open circuits. Two axial tapered piston rotary groups are integrated in one housing; the flow is proportional to the input speed and the displacement, and can be infinitely varied from qV max down to qV min = 0.
This model features LA1H2 control: an individual power controller automatically limits the input power according to the operating pressure, combined with power override via an external pilot pressure at port X3 (reducing the set power) and a hydraulic stroke limiter (positive control). The K version does not include an integrated auxiliary pilot pump or pressure-relief valve; the pilot oil must be supplied from an external source through port Y3 (≥30 bar). The pump can be mounted directly on a diesel engine flywheel housing and retains a power take-off (PTO) for mounting additional axial piston or gear pumps. It is widely used in excavators, cranes, drilling rigs, marine and other multi-circuit mobile and industrial hydraulic systems.
2. Specifications
表格
| Item | Specification |
|---|---|
| Brand | Bosch Rexroth |
| Series | A8VO (Series 61, i.e. Series 6 / Index 1) |
| Design | Bent-axis axial piston variable double pump, open circuit |
| Nominal displacement Vg max | 2 × 107 cm³/rev |
| Min. displacement Vg min | 0 cm³/rev |
| Nominal pressure | 350 bar |
| Peak pressure | 400 bar |
| Max. input speed (at Vg max) nmax1 | 2150 rpm |
| Max. input speed (at Vg ≤ Vg max) nmax | 2450 rpm |
| Max. flow (at nmax, Vg max) qv max | 2 × 230 L/min |
| Max. power (at nmax, Vg max, Δp=350 bar) Pmax | 268 kW |
| Max. input torque Tmax | 1192 N·m |
| Shaft rotation | R (clockwise, viewed from drive shaft end) |
| Shaft end | Splined shaft per DIN 5480 |
| Seals | NBR (shaft seal ring in FKM) |
| Control | LA1H2: individual power controller + power override by pilot pressure + hydraulic stroke limiter (positive control) + external pilot pressure supply |
| Integrated auxiliary pump | None (K version) |
| Pressure-relief valve | None |
| External pilot supply | Required from external source via port Y3 (≥30 bar) |
| Power take-off (PTO) | Yes, for mounting axial piston or gear pumps |
| Approx. mass | Approx. 116 kg |
| Hydraulic fluid | Mineral oil (RE 90220); environmentally acceptable fluids (RE 90221); HF fluids (RE 90223); not suitable for HFA |
Theoretical values (without efficiency and tolerances), per A8VO official data sheet RE 93010. The K version has no integrated auxiliary pump; port Y3 must be connected to an external pilot pressure source (≥30 bar), or to tank if not used. Mounting dimensions, port layout and stroke-limiter start of control should be confirmed against the delivered technical documentation.
5. Model Information
- Material / Ordering number: R902040432
- Type code: A8VO107LA1H2/61R1-NZG05K610
- Product description: Rexroth A8VO series bent-axis variable axial piston double pump, size 107, LA1H2 control, Series 61, clockwise rotation, NBR seals, without integrated auxiliary pump.
- Official catalog description: Variable double pump A8VO with two axial tapered piston rotary groups of bent-axis design for hydrostatic drives in open circuits.
- Material number note: R902040432 is the official Bosch Rexroth material number corresponding to type code A8VO107LA1H2/61R1-NZG05K610. This K version differs from F-suffix versions in that it has no integrated auxiliary pilot pump or pressure-relief valve; pilot oil must be supplied externally through port Y3. If you have questions about suffixes such as ZG05, K610 or cross-reference with F versions, please contact us by email.
- Series features:
- Bent-axis dual rotary-group design, robust and long service life
- Flow proportional to speed and displacement, infinitely variable down to zero
- Individual power controller prevents input power overload
- K version has no integrated auxiliary pump; an external pilot oil source is required
- PTO enables an additional axial piston or gear pump to be mounted
- Excellent power-to-weight ratio; direct mount on diesel flywheel housing
- Related sizes in series: A8VO55 (2×54.8 cm³), A8VO80 (2×80 cm³), A8VO140 (2×140 cm³), A8VO200 (2×200 cm³)
- Matching products: External pilot oil can be provided by Rexroth gear pumps (e.g. 1PF2G, PGH series); axial piston pumps (e.g. A10VSO, A4V series) can be mounted via the PTO; electronic power override can be implemented with BODAS controllers (RC series, see RE 95200 / 95201 / 95202 / 95203)
- Official document: Bosch Rexroth data sheet RE 93010 "Axial Piston Variable Double Pump A8VO, Series 61/63, Sizes 55…200"
6. Why Choose Us
- Exact model match: We verify supply against your full type code and material number R902040432, distinguishing K-version (no auxiliary pump) from F-version (with auxiliary pump) to avoid wrong shipment.
- Authorized channel supply: Bosch Rexroth hydraulic pumps supplied through regular channels, with product documentation available on request.
- Selection support: We help confirm displacement, pressure, speed, control type and external pilot supply configuration match your machine's duty cycle.
- Delivery & after-sales: Quotation, lead-time confirmation and order follow-up provided; for any parameter questions or alternative options, please contact us by email.
7. FAQ
Q1: What is the displacement? Is it a single or double pump?
A: The A8VO107 is a variable double pump with two rotary groups, nominal displacement 2×107 cm³/rev (107 cm³/rev per circuit), adjustable down to 0.
Q2: What is the difference between K610 and F80X versions?
A: The key difference is the integrated auxiliary pilot pump: the K version (K610) has no integrated auxiliary pump or pressure-relief valve—pilot oil must be supplied externally through Y3; the F version (e.g. F80X-S) includes an integrated auxiliary pilot pump and pressure-relief valve. The main pump parameters are otherwise identical.
Q3: What are the nominal and peak pressures?
A: Nominal pressure 350 bar, peak pressure 400 bar (per A8VO data sheet RE 93010, Series 61/63, sizes 55…200).
Q4: What does LA1H2 control mean?
A: LA1H2 is an individual power controller with power override by pilot pressure (external pilot pressure at X3 reduces the set power), combined with a hydraulic stroke limiter (positive control). Since the K version has no integrated auxiliary pump, pilot oil must be supplied from an external control pressure source through port Y3 (≥30 bar).
Q5: What hydraulic fluid can be used?
A: Mineral oil is recommended; choose the viscosity grade (e.g. VG 46 / VG 68, prefer the higher grade) according to operating temperature. Environmentally acceptable fluids and HF fluids are permitted subject to the restrictions in RE 90221 and RE 90223; HFA emulsions are not allowed.
Q6: How do I confirm the ordering number matches my machine?
A: Please rely on the full type code A8VO107LA1H2/61R1-NZG05K610 and material number R902040432 on your machine nameplate or service list, and confirm your system already has an external pilot oil source. If in doubt, please email us for verification.
