Bosch rexroth 12 Series Instruction Manual page 27

▶ A check valve in the drain line is only permissible on a case-by-case basis
following consultation. Please consult your proper contact person at
Bosch Rexroth.
▶ 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, drain, 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.
▶ When designing the reservoir, ensure that there is adequate distance between
the suction line and the drain line. We recommend using a baffle (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 a minimum suction pressure of 0.8 bar absolute (without charge
pump) or 0.7 bar absolute (with charge pump) absolute is present at port
"S" during operation and at cold start, in all installation positions and
installation locations for the axial piston pump, see Fig. 7. See data sheet for
other pressure values.
1 2
0
3
1
Fig� 7: Suction pressure
1 Absolute pressure gauge
2 Standard pressure gauge (relative)
The suction conditions improve with installation below and inside the reservoir.
▶ 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.
▶ When using pump carriers with the installation position "drive shaft upward",
dirt can accumulate on the shaft seal, which can lead to leaks. Particularly in
case of highly contaminated ambient conditions, any potentially present air bleed
bores in the pump carrier should be plugged in compliance with applicable
standards and safety regulations. Apart from that, regular checks and/or cleaning
is necessary. Observe the information in chapter 10.1 "Cleaning and care"
on page 48 and Table 11 "Inspection schedule" on page 49�
Installation | A15VSO/A15VLO series 12
2
0 1
-1
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RE 92802-01-B/2023-03-27, Bosch Rexroth AG
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