Bosch Rexroth AG, RE 92110-01-B/2022-03-22
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A4VSH series 1x and 30
| Assembly
7�4�8 Hydraulically connecting the axial piston unit
NOTICE
Insufficient suction pressure!
For axial piston pumps, a minimum permissible suction pressure is generally
specified at port
S
A
,
S
B
or boost pressure at port
E
. These are valid for all
installation positions. If the pressure at port
S
A
,
S
B
or
E
drops below the specified
values, damage may occur which may lead to the axial piston pump being
damaged beyond repair!
▶ Make sure that the necessary suction/boost pressure is achieved at all times.
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 cartridge or check valve which may be present in the suction/boost
line (check degree of contamination of filter cartridge 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
p
max
permissible
pressures of the respective ports, see Table 11 "Ports A4VSH series 1x and 30"
on page 40. 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 notes when routing the suction, boost, 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/boost line
– For the pressure/boost line lines, use only pipes, hoses and connecting
elements rated for the working pressure range specified in data sheet 92110
(see Table 11).
Information on
routing of lines
