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Rexroth A8VO107LA1KH1/60R1+ZP2PRO29 Variable Axial Piston Pump (Part No. R902000085)
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 LA1KH1 control, combining three functions:
- Individual power control (LA1): automatically limits input power according to operating pressure; an external pilot pressure at port X3 can reduce the set power (power override);
- Hydraulic power coupling (K): the two rotary groups' power controllers are hydraulically coupled for summation power control—both circuits swivel together; if one circuit uses less than 50% of total input power, the remaining power can be transferred to the other (up to 100% of total input power);
- Hydraulic stroke limiter (H1, negative control): rising X1 pilot pressure swivels the pump toward smaller displacement (Vg max → Vg min); control fluid is taken from the high-pressure line (≥30 bar); the depressurized initial position is Vg max.
This model is supplied with the suffix "+ZP2PRO29", meaning the pump ships with the ZP2PRO29 adapter plate pre-mounted to match a specific engine flywheel housing or installation interface. The base pump is a K version without integrated auxiliary pilot pump or pressure-relief valve; pilot oil must be supplied from an external source through port Y3 (≥30 bar). 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 60, i.e. Series 6 / Index 0) |
| 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 |
| Control | LA1KH1: individual power controller (X3 power override) + hydraulic power coupling + hydraulic stroke limiter (negative control, H1) |
| Stroke limiter | X1 pilot pressure 4–40 bar, Δp≈25 bar; rising pilot pressure reduces displacement (Vg max→Vg min); control fluid from high-pressure line, ≥30 bar |
| Pre-assembled accessory | ZP2PRO29 adapter plate |
| Integrated auxiliary pump | None (K version) |
| Pressure-relief valve | None |
| External pilot supply | Required from external source via port Y3 (≥30 bar); if not used, Y3 must be drained to tank |
| Power take-off (PTO) | Yes, for mounting axial piston or gear pumps |
| Approx. mass | Approx. 116 kg (excluding adapter plate) |
| 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. The ZP2PRO29 adapter plate is pre-assembled for a specific installation interface; its mounting dimensions should be confirmed against the delivered drawing. H1 negative control works with open-center pilot directional valves.
5. Model Information
- Material / Ordering number: R902000085
- Type code: A8VO107LA1KH1/60R1+ZP2PRO29
- Product description: Rexroth A8VO series bent-axis variable axial piston double pump, size 107, LA1KH1 control (power override + hydraulic power coupling + hydraulic stroke limiter, negative control), Series 60, clockwise rotation, NBR seals, without integrated auxiliary pump, pre-assembled with ZP2PRO29 adapter plate.
- 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: R902000085 is the official Bosch Rexroth material number corresponding to type code A8VO107LA1KH1/60R1+ZP2PRO29. The "+ZP2PRO29" indicates the pump ships with the ZP2PRO29 adapter plate pre-mounted, distinguishing it from the bare base pump (e.g. R902000084 A8VO107LA1KH1/60R1-NSG05K04). The K version has no integrated auxiliary pump. If you have questions about the ZP2PRO29 mounting dimensions or cross-reference with the base pump, 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
- Hydraulic power coupling provides summation power distribution between circuits
- Hydraulic stroke limiter (H1 negative control) infinitely limits displacement via external pilot signal
- Individual power controller prevents input power overload, with X3 external pilot-pressure power override
- Pre-assembled ZP2PRO29 adapter plate simplifies installation
- K version has no integrated auxiliary pump; 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 open-center pilot directional valves for H1 negative control; external pilot oil can be provided by gear pumps; axial piston or gear pumps can be mounted via the PTO; electronic power override can be implemented with BODAS controllers (RC series)
- 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 R902000085, including the pre-assembled ZP2PRO29 adapter plate—not substituted with the bare pump version.
- 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, adapter plate interface and external pilot supply configuration match your machine.
- 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 "+ZP2PRO29" in the type code mean?
A: "+ZP2PRO29" means the pump is shipped with the ZP2PRO29 adapter plate pre-mounted, designed to match a specific engine flywheel housing or installation interface, so no separate adapter plate needs to be selected on site. Mounting dimensions should be confirmed against the delivered drawing.
Q3: What does LA1KH1 control mean?
A: LA1KH1 = individual power controller (X3 pilot-pressure power override) + hydraulic power coupling (summation power control between circuits) + hydraulic stroke limiter (H1 negative control: rising X1 pilot pressure reduces displacement from Vg max to Vg min; control fluid is taken from the high-pressure line, ≥30 bar).
Q4: Is this a K or F version?
A: This is a K version without integrated auxiliary pilot pump or pressure-relief valve; pilot oil must be supplied externally through Y3 (≥30 bar). This differs from F versions, which include an integrated auxiliary pilot pump and pressure-relief valve.
Q5: What is the difference between H1 negative and H2 positive control?
A: H1 (negative): rising pilot pressure reduces displacement (Vg max → Vg min), control fluid from the high-pressure line, used with open-center pilot valves. H2 (positive): rising pilot pressure increases displacement (Vg min → Vg max), requires external pilot supply via Y3.
Q6: How do I confirm the ordering number matches my machine?
A: Please rely on the full type code A8VO107LA1KH1/60R1+ZP2PRO29 and material number R902000085 on your machine nameplate or service list, and confirm the adapter plate interface matches your equipment. If in doubt, please email us for verification.
