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Company Culture  ꄲ  Fluid Power  ꄲ  Rexroth A8VO107LA1KH1/60R1-NSG05K04 Variable Axial Piston Pump (Part No. R902000084)
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Rexroth A8VO107LA1KH1/60R1-NSG05K04 Variable Axial Piston Pump (Part No. R902000084)

Bosch Rexroth A8VO series bent-axis variable double pump, nominal displacement 2×107 cm³/rev, nominal pressure 350 bar / peak 400 bar, LA1KH1 individual power control (power override + hydraulic power coupling + hydraulic stroke limiter, negative control), without integrated auxiliary pump, for open-circuit hydrostatic drives in construction machinery.
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Product Details

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:

  1. 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);
  2. 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);
  3. 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 K version does not include an integrated auxiliary pilot pump or pressure-relief valve; 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 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 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
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
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 unused. H1 negative control works with open-center pilot directional valves; control fluid is taken from the high-pressure line. The start of control (at Vg max) is adjustable 0–15 bar.

5. Model Information

  • Material / Ordering number: R902000084
  • Type code: A8VO107LA1KH1/60R1-NSG05K04
  • 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.
  • 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: R902000084 is the official Bosch Rexroth material number corresponding to type code A8VO107LA1KH1/60R1-NSG05K04. This is the bare pump version (no pre-assembled adapter plate), sharing the same base pump as R902000085 (A8VO107LA1KH1/60R1+ZP2PRO29, which ships with the ZP2PRO29 adapter plate pre-mounted). The K version has no integrated auxiliary pump. If you have questions about suffixes such as NSG05, K04 or cross-reference with the adapter-plate version, 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
    • 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 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

  1. Exact model match: We verify supply against your full type code and material number R902000084, distinguishing the bare pump from the ZP2PRO29 pre-assembled version (R902000085) to avoid wrong shipment.
  2. Authorized channel supply: Bosch Rexroth hydraulic pumps supplied through regular channels, with product documentation available on request.
  3. Selection support: We help confirm displacement, pressure, speed, pilot valve configuration and external pilot supply match your machine's duty cycle.
  4. 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 this model and A8VO107LA1KH1/60R1+ZP2PRO29 (R902000085)?

A: They are the same base pump with identical LA1KH1 control, Series 60 and K version. The only difference: R902000084 is the bare pump without a pre-assembled adapter plate; R902000085 ships with the ZP2PRO29 adapter plate pre-mounted. Choose the bare pump if you already have your own adapter plate or mounting flange.

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 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.

Q6: How do I confirm the ordering number matches my machine?

A: Please rely on the full type code A8VO107LA1KH1/60R1-NSG05K04 and material number R902000084 on your machine nameplate or service list, and confirm your pilot directional valves are open-center type (for H1 negative control) and that your system has an external pilot oil source. If in doubt, please email us for verification.

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