A10VO PISTON PUMP MANUAL-MODULE 3A
DESCRIPTION
Axial piston pumps model A10V0 are swash plate design variable displacement pumps. As
illustrated by the picture under functional purpose they basically consist of a housing (1), control
pistons (2) located inside cylinder barrel, drive shaft (3), swash plate (4), a control valve assembly
(5), and pistons (6)
This piston pump smoothly and continuously varies its displacement (volumetric output – size), by
altering the angle of its swash plate. As your system operates, valves monitor the loads
(pressures) on the actuators (cylinders and motors) and control the swash plate accordingly. The
greater the angle of the swash plate, relative to the drive shaft, the further the pistons stroke in
and out, therefore the greater the fluid flow.
There are two control valves, located in a removable housing, bolted to the pump. The standard
type of control used is referred as flow and pressure compensation, type DFR. A simple
explanation of how this works is described in the next paragraph. We have limited the explanation
to one short paragraph as a detailed explanation goes beyond the technical requirements of this
Generic Manual.
The flow and pressure compensator control, also known as a load– sensing control, matches
pump output flow and pressure to system demand. This control will automatically regulate the
pump displacement to deliver the flow required to maintain a constant pressure drop across a
valve spool or other flow limiting device. When there is no system demand, the pump stands by at
zero flow and low pressure. When the system demands flow, the pump delivers only the flow
required by the system, at a pressure required to move the load.
To protect the system from infinite load pressures, the pressure compensator section of the
control will cause the pump to automatically de-stroke when the pre–adjusted maximum system
pressure is reached.
Bosch Rexroth Canada Corp. 3426 Mainway Dr. Burlington, ON L7M 1A8
www.boschrexroth.ca
16/06/2006
Page 6 of 23