Bosch REXROTH A4 Series - Above-Reservoir Installation

Installation 43/104
RE 92076-01-B/10.2017, A4... with HS5E pilot control valve/Series 3x, Bosch Rexroth AG
7.3.2 Above-reservoir installation
Above-reservoir installation means that the axial piston unit is installed above the
minimum fluid level of the reservoir.
To prevent the axial piston unit from draining, a height difference h
ESmin
of at least
25mm at port T is required in installation position6.
Observe the maximum permissible suction heighth
Smax
= 800mm. The
permissible suction heighth
S
is derived from the total pressure loss.
Recommendation for installation position6 (drive shaft upward): A check valve
in the drain line (cracking pressure 0.5bar) can prevent the housing area from
draining.
4 5 6
SB
F
h
t min
h
min
h
S max
h
t min
h
min
h
S max
SB
F
h
ES min
SB
h
t min
F
h
min
h
S max
R(L)
K
1, 2
T
S
R(L)
K
1, 2
K
1, 2
R(L)
T
T
S
S
Einschraubloch M22
M10 (x1.5)
M16 (x2)
M16 (x2)M16 (x2)
M16 (x2)
M8 (x1.25)
Einschraubloch M22
M10 (x1.5)
M16 (x2)
M16 (x2)M16 (x2)
M16 (x2)
M8 (x1.25)
Einschraubloch M22
M10 (x1.5)
M16 (x2) M16 (x2)M16 (x2)
M16 (x2)
M8 (x1.25)
Fig. 13: Above-reservoir installation of A4VSO with installation position 4-6
F
Filling / air bleeding
h
min
Minimum required distance to
reservoir bottom (100mm)
T, R(L)
Highest drain port
h
ES min
Minimum required height needed
to protect the axial piston unit from
draining (25mm)
S
Suction port
h
S max
Maximum permissible suction height
(800mm)
SB
Baffle (baffle plate)
h
t min
Minimum required immersion depth
(200mm)
Port F is part of the external piping and must be provided on the customer side
to make filling and air bleeding easier.
Table 11: Above-reservoir installation
Installation position Air bleed Filling
4 (drive shaft horizontal) F R(L) (F)
5 (drive shaft horizontal) F T (F)
6 (drive shaft vertically downward) F T (F)