Installation 33/68
RE 92004-01-B/05.2017, A4VG Series 40,
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.
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
10
(drive shaft upward): A check valve
in the drain line (cracking pressure 0.5 bar) can prevent the housing area from
draining.
7
8
9
10
11
12
h
t min
h
min
h
S max
T
2
S
F
2
SB
F
1
h
t min
h
min
h
S max
T
2
S
F
2
SB
F
1
X
2
,
X
1
h
t min
h
min
h
S max
T
1
S
F
2
SB
0.5 bar
F
1
R
1
X
4
,
X
3
h
t min
h
min
h
S max
X
3
T
2
T
1
S
F
2
SB
F
1
X
1
X
2
X
1
X
2
h
t min
h
min
h
S max
X
4
T
2
T
1
S
SB
F
2
F
1
h
t min
h
min
T
1
F
2
S
R
SB
h
S max
F
1
X
2
,
X
1
Fig. 9: Above-reservoir installation A4VG with installation position 7-12
T
1
,
T
2
Highest drain port
X
3
,
X
4
Stroking chamber pressure port
F
1
,
F
2
Filling / air bleeding
h
t min
Minimum required immersion depth
(200 mm)
R
Air bleed port
h
min
Minimum required distance to
reservoir bottom (100 mm)
R
1
Air bleed port (special version)
h
S max
Maximum permissible suction height
(800 mm)
S
Suction port
SB
Baffle (baffle plate)
X
1
,
X
2
Control pressure port
Ports
F
1
and
F
2
are part of the external piping and must be provided on the
customer side to make filling and air bleeding easier.
