Rexroth A15VO Swashplate variable displacement hydraulic pump

The A15VO is an axial piston variable displacement pump built by Bosch Rexroth for open-circuit hydrostatic drive systems, primarily in mobile and off-highway equipment. It belongs to the same swashplate-design family as the A15VSO/A15VLO industrial series, but it's engineered specifically for mobile applications — think excavators, wheel loaders, cranes, and other equipment where duty cycles are harsher, ambient conditions swing wider, and packaging space is tighter than in a stationary factory installation.

The pump is available in a range of displacement sizes, commonly from 110 cc/rev up to 280 cc/rev, giving it enough scalability to cover mid-size implements as well as heavier equipment. Its nominal pressure rating sits around 350 bar (roughly 5,100 psi), with peak pressure capability up to about 420 bar (roughly 6,100 psi) for intermittent load spikes.

Control Strategies

The A15VO can be fitted with several control types depending on the application:

Pressure control (DR) — holds system pressure at a set point by de-stroking the pump as pressure rises

Power control (DA/LR) — limits input power draw so the prime mover isn't overloaded, regardless of pressure/flow combination

Load-sensing control (LS) — matches pump output to actual downstream demand, minimizing throttling losses

Electro-proportional control (EP) — allows an external controller to command swashplate position directly, useful in electro-hydraulic systems with programmable logic

Common Issues and Failure Modes

Loss of Pressure or Flow Under Load

Often traced to worn piston shoes, a scored swashplate surface, or a failing control valve that isn't sending a full stroke signal to the servo piston. Before assuming internal wear, check the control pressure signal first — a lot of "pump failures" turn out to be a stuck or contaminated control spool.

Excessive Noise or Cavitation

Usually a suction-side problem: restricted inlet line, degraded hydraulic fluid, or an inlet filter close to bypass. Because the A15VO can self-prime in many configurations, a marginal suction condition can run for a while before it becomes an audible problem. By this point, some cavitation damage to the pistons or barrel may have already started.

Overheating

Frequently linked to running near maximum displacement continuously when the system was sized for intermittent peak demand, or to a control device holding the swashplate at too aggressive an angle for the actual duty cycle. Checking case drain flow and temperature is usually the fastest way to catch this issue early, since case drain rise is one of the earliest indicators of internal leakage before external symptoms appear.

Swashplate Bearing Wear

Because the swashplate constantly pivots under full system pressure, its trunnion bearings take continuous cyclic load. In equipment with heavy directional-change duty cycles (frequent forward/reverse or rapid implement reversals), these bearings tend to be the wear item that eventually limits pump life, even when the rest of the pump is in good condition.

For more information on the A15VO hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: Can the A15VO run in tandem with another pump?

A1: Yes — it supports a through-drive configuration, allowing a second pump (up to the same nominal size) to be mounted off the same input shaft, which is common in multi-circuit mobile machines.

Q2: What causes most premature failures in these pumps?

A2: Contaminated hydraulic fluid is the single biggest driver of premature wear in axial piston pumps, generally, given how tight the internal clearances are. Inadequate suction conditions and running at sustained high displacement beyond the duty cycle the system was designed for are the next most common causes.

Q3: How to purchase an A15VO 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 A15VO hydraulic pump?

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