Installation 29/56
RE 93221-01-B/07.2013, A22VG Series 40, Bosch Rexroth AG
The direction of rotation as specified on the name plate determines the direction
of rotation of the axial piston unit as viewed on the drive shaft, see chapter 5.3
“Product identification” on page 19.
7.4.2 Dimensions
The installation drawing contains the dimensions for all connections and ports on
the axial piston unit. Also observe the instructions provided by the manufacturers of
the other hydraulic components when selecting the required tools.
7.4.3 General instructions
Please keep in mind the following general instructions for installation of the axial
piston unit:
t Note that you can expect certain installation positions to affect the control
device. Gravity, dead weight and case pressure can cause minor shifts in control
characteristics and changes in response time.
t Torsional vibrations and speed variations may cause leakages on the shaft seal and
increased rotary angle accelerations of the rotary group of the axial piston unit. At
risk are diesel drives with a small number of cylinders and low flywheel mass and
toothed belt or V-belt drives. Belts can lose a large part of its tension after just a
short time.
An automatic clamping device can lessen the speed variations and vibrations and
thus avoid consequential damage.
– Always use an automatic clamping device when using toothed belts or V-belts to
transfer the input or output drive.
t On the input or output drive of an axial piston unit, a cardan shaft may cause
vibrations and impermissible rotary angle accelerations. Depending on the
frequency and temperature, they may result in leakage on the shaft seal and
damage to the rotary group.
t For combinations of multiple units, make sure that the respective case pressure
in each unit is not exceeded. In the event of differential pressures at the drain
ports of the units, the shared drain line must be changed so that the minimum
permissible case pressure of all connected units is not exceeded in any situation.
If this is not possible, separate drain lines must be laid if necessary.
How to install the axial piston unit depends on the connecting elements to the drive
side. The following descriptions explain the installation of the axial piston unit:
t with a coupling
t on a gearbox
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