Bosch Rexroth A10VG18 Variable Displacement Closed Circuit Hydraulic Pump

The A10VG18 belongs to Bosch Rexroth's A10V series, but with a critical distinction: it is designed exclusively for closed circuit (hydrostatic) operation. The “18” denotes a maximum displacement of 18 cm³ per revolution, making it a compact yet capable unit in the 18-28 kW power range.

Design Deep Dive: What Makes the A10VG18 Unique?

Anatomy of Reliability – Key Components

Swashplate and Piston Barrel

The swashplate angle determines displacement. At zero angle, no flow occurs. At maximum angle, the pump delivers 18 cc/rev to either port A or B, depending on direction. The piston barrel is supported by a hydrodynamic slipper pad for low friction, even at high pressures.

Integrated Charge Pump (The Unsung Hero)

A closed circuit needs makeup fluid to compensate for leakage and cooling. The A10VG18 includes a fixed displacement charge pump (typically 6–9 cc/rev) that supplies cool, filtered oil from the reservoir into the low-pressure side of the loop. It also feeds the pilot control circuit.

Expert note: The charge pump's relief valve setting (usually 15–25 bar) is critical. Too low → cavitation. Too high → wasted energy and heat.

High-Pressure Relief & Crossport Valves

Integrated relief valves protect the pump and motor from shock loads. The A10VG18 uses two relief valves (one per side) plus a crossport shuttle valve to direct excess flow back to the low-pressure side, preventing pressure spikes during deceleration.

Applications – Where the A10VG18 Excels

Example 1: Compact Track Loaders

A 50 hp tracked loader requires independent forward/reverse motion for each track. Two A10VG18 pumps (one per track) provide infinitely variable speed and precise steering via zero-displacement neutral. The closed circuit eliminates the heat and lag of open center directional valves.

Example 2: Small Agricultural Spreaders

Hydraulic-driven spreader disks need constant torque at varying speeds. Using an A10VG18 with an electric proportional control allows the cab computer to adjust spread rate instantly without mechanical linkages.

Example 3: Self-Propelled Aerial Work Platforms (Boom Lifts)

The pump's compact size fits inside a chassis rail. The closed circuit gives smooth ramp-up and braking, reducing shock to the operator. Integrated flushing valves help cool the loop during long descents.

Maintenance & Common Failure Points

Even robust pumps require care. Here's what to watch on the A10VG18:

1.Charge Pressure Drop (The 1 Warning)

If charge pressure falls below 8 bar (at operating temperature), the main pump cavitates. Causes: clogged charge filter (10–25 micron is typical), worn charge pump, or oil degradation.

2.Case Drain Flow Monitoring

The A10VG18 has a case drain line (usually ½” or ¾”). Measure flow and temperature. High case drain flow (>8 L/min at 250 bar) indicates internal wear in the piston/slipper interface.

3.Shaft Seal Leakage

The input shaft seal can fail if the case drain is restricted (back pressure >2 bar absolute). Always pipe case drain separately with no sharp elbows.

4.Control Linkage Stiction

On HD controls, a sticking spool causes delayed or no response. Use clean, water-free hydraulic oil (ISO VG 32–46, with anti-wear additives).

For more information on the A10VG18 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: What hydraulic motors pair best with this pump?

A1: Bosch Rexroth’s A2FM fixed motor or A6VM variable motor. For budget builds, any bent-axis or axial piston fixed motor with similar pressure rating (350 bar continuous) works.

Q2:How do I adjust neutral on the A10VG18?

A2: Neutral (zero flow) is set via the control valve’s mechanical stop or electrical trim. For HD control, loosen the locknut and rotate the external screw until a motor connected to the pump stops turning under no load.

Q3:How to purchase an A10VG18 hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the A10VG18 hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.