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Axial piston units
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Maintenance and repair
Bosch Rexroth AG, RE 90300-B/2021-01-19
10.2 Inspection
In order for the axial piston unit to be reliable and long-lasting, Bosch Rexroth
recommends inspecting the hydraulic system and axial piston unit on a regular basis,
and documenting and archiving the following operating conditions:
Table 8: Inspection schedule
Tasks to be performed
Interval
Hydraulic
system
Check hydraulic fluid level in the reservoir.
Daily
Check the operating temperature under comparable
load condition at the drain port and in the reservoir.
Weekly
Perform hydraulic fluid analysis: Viscosity, aging and
contamination
Yearly or every 2000
operating hours
(whichever occurs first)
If present,check the filter.
The replacement interval may vary depending on the
cleanliness of the hydraulic fluid. We recommend
using a contamination indicator.
Yearly or every 1000
operating hours
(whichever occurs first)
Axial piston unit Check axial piston unit for leakage.
Early detection of hydraulic fluid loss can help to
find faults on the machine/system and rectify them.
This is why Bosch Rexroth recommends always
keeping the axial piston unit and system clean.
Daily
Check axial piston unit for unusual noise
development.
Daily
Check mounting elements for tight seating.
All fasteners have to be checked when the hydraulic
system is switched off, depressurized and cooled
down.
Monthly
Change the filter element in optionally mounted
filters. The replacement interval may vary depending
on the cleanliness of the hydraulic fluid. We
recommend using a contamination indicator.
Half-yearly or every
500 operating hours
(whichever occurs first)
10.3 Maintenance
The axial piston unit is low-maintenance when used as intended.
The service life of the axial piston unit is heavily dependent on the quality of the
hydraulic fluid. This is why we recommend changing the hydraulic fluid at least once
per year or every 2000 operating hours (whichever occurs first), or having it analyzed
by the hydraulic fluid manufacturer or a laboratory to determine its suitability for
further use.
The service life of the axial piston unit is limited to the service life of the bearings
used if the permissible operating parameters are observed. You can ask your local
contact person about service life based on load cycle. You can find their contact
information at
www.boschrexroth.com/addresses
Based on these parameters, a maintenance interval should be determined by the
system manufacturer for the replacement of the bearings and included in the
maintenance schedule of the hydraulic system.
