Bosch rexroth A4VSO 10 Series Instruction Manual page 39

To guarantee lubrication of the front bearing and of the shaft seal with
above-reservoir installation, Rexroth specifies a working bearing flushing at "U".
risk of damage due to inadequate lubrication!
Ensure adequate lubrication
to avoid damage to the axial piston unit.
▶ Make sure the case is completely filled with hydraulic fluid during
commissioning and operation when installed with the drive shaft up
(e.g., no air inclusions).
▶ Check the hydraulic fluid level in the housing regularly and recommission, if
necessary. With above-reservoir installation, the housing area may drain via the
drain line after longer standstill periods (air enters via the shaft seal ring) or via
the working line (gap leakage). The bearings are thus insufficiently lubricated
when recommissioning.
▶ Make sure that the suction line is always filled with hydraulic fluid during
commissioning and operation.
▶ Make sure that the bearing flushing is working properly for above-reservoir
installation and in all installation positions with the drive shaft up. To do
this, check, for example, the flushing pressure or the minimum flushing flow,
see data sheet (Part II).
Observe the maximum permissible suction height h
The permissible suction height h
5
T
h
s max
h
t min
h
min
Fig. 8: Above-reservoir installation with horizontal installation position 5 and vertical installation
position 6
1) Install bearing flushing, please refer to data sheet (Part II) for minimum flushing flow
r(L) Fluid filling and air bleeding
(drain port)
t Fluid drain
S Suction port
U Flushing port
RE 92050-01-X-B1/2019.08.23, Axial piston variable pump A4VSO, Bosch Rexroth AG
CAUtion
is derived from the total pressure loss.
S
6
F
F
R(L)
S
h
s max
SB h
t min
h
min
h
min
h
t min
SB
Installation
= 800 mm.
S max
U
T
1)
R(L)
S
Minimum required distance
to reservoir bottom (100 mm)
Minimum required immersion depth
(200 mm)
Baffle (baffle plate)
35/72