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Rexroth A8VO107LA1KS/61R1-NZG05F154 Variable Axial Piston Pump (Part No. R902031696)
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 LA1KS control, combining three functions:
- Individual power control: automatically limits input power according to operating pressure; an external pilot pressure at port X3 can reduce the set power (power override);
- Load sensing (LS): the LS regulator adjusts pump displacement according to the pressure drop (Δp) across the metering orifice of an external directional valve, delivering flow on demand and maintaining a constant Δp to reduce throttling and relief losses;
- Hydraulic power coupling (K): the two individual power controllers are hydraulically coupled to provide summation power control—both rotary groups swivel together; if one circuit uses less than 50% of total input power, the remaining power can be transferred to the other circuit (up to 100% of total input power).
This F version includes an integrated auxiliary pilot pump and pressure-relief valve. The pump can be mounted directly on a diesel engine flywheel housing and retains a power take-off (PTO) for mounting additional pumps. It is widely used in excavators, cranes, drilling rigs 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 | LA1KS: individual power controller (with pilot-pressure power override) + load sensing (LS) + hydraulic power coupling |
| Integrated auxiliary pump | Yes (F version), with pressure-relief valve |
| 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. Load sensing requires an external LS directional control valve; Δp across the metering orifice is set by the control system. Mounting dimensions, port layout and power setting should be confirmed against the delivered technical documentation.
5. Model Information
- Material / Ordering number: R902031696
- Type code: A8VO107LA1KS/61R1-NZG05F154
- Product description: Rexroth A8VO series bent-axis variable axial piston double pump, size 107, LA1KS control (power override + load sensing + hydraulic power coupling), Series 61, clockwise rotation, NBR seals, with integrated auxiliary pump and pressure-relief valve.
- 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: R902031696 is the official Bosch Rexroth material number corresponding to type code A8VO107LA1KS/61R1-NZG05F154. LA1KS differs from LA1H2 (hydraulic stroke limiter) and LA1K (no load sensing) in that it combines power override, load sensing and hydraulic power coupling between both circuits. If you have questions about suffixes such as ZG05, F154 or cross-reference alternatives, 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
- Load sensing delivers flow on demand, reducing throttling and relief losses
- Hydraulic power coupling provides summation power distribution between circuits for better engine power utilization
- Individual power controller prevents input power overload, with external pilot-pressure power override
- Integrated auxiliary pilot pump with pressure-relief valve; PTO allows an additional 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: Requires LS-type multi-circuit directional valves (e.g. Rexroth M4, RM series); axial piston pumps (e.g. A10VSO, A4V series) or gear pumps 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 R902031696, distinguishing LA1KS (LS + power coupling) from LA1H2 (stroke limiter) and other control versions 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, LS valve matching and power setting align with 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 does LA1KS control mean? How is it different from LA1H2?
A: LA1KS = individual power controller (with X3 pilot-pressure power override) + load sensing (LS, flow on demand) + hydraulic power coupling (summation power control between circuits). LA1H2 = individual power controller (with power override) + hydraulic stroke limiter (external pilot pressure sets displacement). Both include power override, but LA1KS targets LS multi-circuit systems, while LA1H2 targets applications where displacement is set by external pilot signals.
Q3: What is the benefit of load sensing (LS)?
A: The LS regulator maintains a constant pressure drop (Δp) across the external directional valve's metering orifice; the pump delivers only the flow demanded by the actuator, avoiding high-pressure overflow losses and improving efficiency and controllability.
Q4: What is hydraulic power coupling (K)?
A: The power controllers of both rotary groups are hydraulically connected so the two circuits swivel together. If one circuit draws less than 50% of total input power, the remaining power is automatically transferred to the other circuit (up to 100% of total input power), making full use of engine power.
Q5: 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).
Q6: How do I confirm the ordering number matches my machine?
A: Please rely on the full type code A8VO107LA1KS/61R1-NZG05F154 and material number R902031696 on your machine nameplate or service list, and confirm your hydraulic system uses LS-type directional valves. If in doubt, please email us for verification.
