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Bosch Rexroth evaluates hydraulic fluids on the basis of the Fluid Rating
according to data sheet 90235. For hydraulic fluids which have been positively
evaluated in the Fluid Rating, please refer to data sheet 90245 "Bosch Rexroth
fluid rating list for Rexroth hydraulic components (pumps and motors)".
Selection of hydraulic fluid shall make sure that the operating viscosity in the
operating temperature range is within the optimum range (ν
diagram in the data sheet 92512).
To ensure the functional reliability of the axial piston unit, cleanliness level 20/18/15
according to at least ISO 4406 is required for the hydraulic fluid. At a hydraulic fluid
viscosity of less than 10 mm²/s (e.g. due to high temperatures during short-term
operation) at the drain port, a cleanliness level of at least 19/17/14 according to
ISO 4406 is required. You can find parameters on the permissible and optimal
viscosities and admissible temperatures in data sheet 92512�
Procedure
Proceed as follows to fill the axial piston unit:
1� Place a drip tray under the axial piston unit to collect any hydraulic fluid that
may leak.
NOTICE! Contaminated hydraulic fluid!
The cleanliness levels of commercial hydraulic fluids are usually insufficient for the
requirements of our components.
▶ Use a suitable filter system to filter hydraulic fluids during filling to minimize
solid particle contamination and water in the hydraulic system.
2� Fill and air bleed the axial piston unit via the appropriate ports; see chapter 7.3
"Installation position" on page 28. Also fill the hydraulic lines of the system.
NOTICE! Risk of property damage due to inadequate lubrication!
Product can be damaged or destroyed!
▶ When using a shut-off valve in the suction line, make sure that the drive of the
axial piston unit can only be started when the shut-off valves are open.
▶ Dimension a shut-off valve in the suction line so that no inadmissible pressure
drop occurs in the suction area when the shut-off valve is open.
3� If you use a shut-off valve in the suction line, only operate the axial piston unit
with opened shut-off valves.
4� Test the direction of rotation of the drive motor. To do this, run the drive motor
briefly at the lowest rotational speed (inching). Make sure that the direction
of rotation of the axial piston unit agrees with the details of the name plate,
see chapter 5.3 "Product identification", Fig. 4: A15VO name plate on page 21.
5� Operate the axial piston pump at a low rotational speed (starter speed for
internal combustion engines and/or inching mode for electric motors)
until the hydraulic system is completely filled and air bled. To verify, drain the
hydraulic fluid at the drain port until there are no bubbles in the fluid.
Commissioning | A15VO/A15VLO series 12
RE 92512-01-B/2023-03-27, Bosch Rexroth AG
43/60
; see selection
opt
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