30/68 Installation
Bosch Rexroth AG
, A4VG Series 40, RE 92004-01-B/05.2017
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Avoid using a check valve in the drain line.
Exception: Above-reservoir installation, drive shaft upward.
A check valve in the drain line (cracking pressure 0.5 bar) can prevent the system
from draining through the drain line. Please note the correct flow direction.
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To keep noise down, decouple all connecting lines from all vibration-capable
components (e.g. reservoir) using elastic elements.
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Make sure that the suction, drain, and return lines flow into the reservoir below
the minimum fluid level in all operating conditions. This will prevent air from
being drawn in and foam from being formed.
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Make sure that a minimum suction pressure of 0.8 bar absolute is present
at port
S
(0.5 bar absolute for cold start) during operation in all installation
positions and installation locations for the axial piston pump, see Fig. 7. See data
sheet for pressure values.
-0.2
0.8 abs.
1 2
3
0
0 1
2
-1
2
1
S
Fig. 7: Suction pressure
1
Absolute pressure gauge
2
Standard pressure gauge (relative)
The suction conditions improve with below-reservoir installation.
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Make sure that the working environment at the installation site is completely
free of dust and foreign substances. The axial piston unit must be installed in
a clean condition. Contamination of the hydraulic fluid can considerably affect
the function and service life of the axial piston unit.
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Use fiber-free cloths for cleaning.
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Use suitable mild cleaning agents to remove lubricants and other difficult-to-
remove contamination. Cleaning agents must not enter the hydraulic system.