RE91405-01-B/2021-05-21, BoschRexrothAG
Installation | A2FO series 70 25/52
▶ Avoid using acheck valve in the drain line.
Exception: Above-reservoir installation, drive shaft upward.
Acheck valve in the drain line (cracking pressure 0.5bar) can prevent the system
from draining through the drain line. Please note the correct flow direction.
▶ To prevent the transmission of structure-borne noise, use elastic elements
to decouple all connecting lines from all vibration-capable components
(e.g. reservoir, frame parts).
▶ Make sure the suction, leakage, and return lines flow into the reservoir below
the minimum fluid level under all operating conditions. This will prevent air from
being drawn in and foam from forming.
▶ For the reservoir design, ensure that there is an adequate distance between
the suction line and the drain line. We recommend using abaffle (baffle plate)
between suction line and drain line. A baffle improves the air separation
ability as it gives the hydraulic fluid more time for desorption. Apart from
that, this prevents the heated return flow from being drawn directly back into
the suction line. The suction port must be supplied with air-free, "calmed"
and cooled hydraulic fluid.
▶ Make sure that aminimum suction pressure of 0.8bar absolute is present at
portS during operation for all installation positions and installation locations of
the axial piston pump; see Fig. 6. See datasheet for other pressure values.
1
2
3
0
0
1
2
-1
-0.2
0.8 abs.
2
1
S
Fig� 6: Suction pressure
1 Absolute pressure gage
2 Standard pressure gage (relative)
The suction conditions improve with below-reservoir installation.
▶ Make sure that the working environment at the installation site is completely
free of dust and foreign substances. The axial piston unit should be clean when
installed. Contamination of the hydraulic fluid can considerably affect the
function and service life of the axial piston unit.
▶ Use fiber-free cleaning cloth.
▶ Use suitable, mild cleaning agents to remove lubricants and other heavy
contamination. Do not allow cleaning agents to enter into the hydraulic system.
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