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Axial piston units
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Installation
Bosch Rexroth AG, RE 90300-B/2021-01-19
7.4.8 Hydraulically connecting the axial piston unit
NOTICE
Insufficient suction pressure!
Generally, a min. permissible suction pressure at port
S
is specified for axial
piston pumps in all installation positions. If the pressure at port
S
drops below the
specified values, damage may occur which may lead to the axial piston pump being
damaged beyond repair!
▶ Make sure the required suction pressure is maintained. This is influenced by:
– The piping (e.g. suction cross-section, pipe diameter, length of suction line)
– The position of the reservoir
– The viscosity of the hydraulic fluid
– A filter element or check valve in the suction line (check the level of
contamination of the filter element regularly)
– The geodesic height of the place of use
The machine/system manufacturer is responsible for dimensioning of the lines.
Connect the axial piston unit to the rest of the hydraulic system in accordance with
the hydraulic circuit diagram of the machine/system manufacturer.
The ports and fastening threads are designed for the maximum pressure specified
in the product-specific data sheet. The machine/system manufacturer is required
to ensure that the connecting elements and lines correspond to the specified
application conditions (pressure, flow, hydraulic fluid, temperature) with the
necessary safety factors.
Connect only hydraulic lines that are match the axial piston unit port
(pressure level, size, system of units).
Observe the following information when routing the suction, pressure and drain lines.
• Lines and hoses should be installed without pre-charge pressure so no further
mechanical forces are applied during operation that will reduce the service life of
the axial piston unit and, possibly, the entire machine/system.
• Use suitable seals as sealing material.
• Suction line (pipe or hose)
– The suction line should be as short and straight as possible.
– Measure the line cross section of the suction line so the pressure at the suction
port does not drop below the minimum permissible pressure. Make sure the
maximum suction pressure is not exceeded (e.g. when prefilling).
– Make sure the connections and connecting elements are airtight.
– The hose must be pressure-resistant, also to external air pressure.
• Pressure line
– For the pressure lines, use only pipes, hoses and connecting elements rated for
the working pressure range specified in the product-specific data sheet.
Information on routing of
lines
