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Installation
Bosch Rexroth Corporation
, A21VG Series 10, RE 93223-01-B/09.2020
7.4.8
Hydraulically connecting the
axial piston unit
NOTICE
Insufficient suction pressure!
Generally, a minimum permissible suction pressure at port “
S
” is specified for
axial piston pumps with boost pump 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 that the necessary suction pressure is not undercut. 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
–
if fitted, a filter cartridge or check valve in the suction line (regularly check
the level of soiling of the filter cartridge)
The machine/system manufacturer is responsible for dimensioning the lines.
The axial piston unit must be connected to the rest of the hydraulic system in
accordance with the hydraulic schematic of the machine/system manufacturer.
The ports and fastening thread are designed for the maximum pressure specified in
the data sheet. The machine/system manufacturer must 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 appropriate for the axial piston unit port
(pressure level, size, system of units).
Observe the following notes when routing the suction, pressure and reservoir
lines.
•
Lines and hoses must be installed without pre-charge pressure, so that no further
mechanical forces are applied during operation that will reduce the service life of
the axial piston unit and, if applicable, 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 that the pressure at the
suction port does not drop below the minimum permissible pressure. Make
sure that the maximum suction pressure is not exceeded (e.g. when pre-filling).
–
Make sure the connections and connecting elements are air-tight.
–
The hose must be pressure-resistant, also for external air pressure.
•
Pressure line
–
For the pressure lines, use only pipes, hoses and connecting elements rated for
the operating pressure range specified in data sheet
93223
(see Table 10).
Notes on routing the lines
