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Bosch Rexroth AG, A22VG Series 40, RE 93221-01-B/07.2013
10.2 Inspection
In order to enable long and reliable operation of the axial piston unit, Bosch Rexroth
recommends testing the hydraulic system and axial piston unit on a regular basis,
and documenting and archiving the following operating conditions:
Table 12: Inspection schedule
Task to be carried out Interval
Hydraulic
system
Check level of hydraulic fluid in the reservoir. Daily
Check the operating temperature at a comparable load
condition at the reservoir port and in the reservoir.
Weekly
Conduct analysis of hydraulic fluid: viscosity, aging and
dirt contamination
Yearly or every 2000
operatinghours
(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 to rectify them.
For this reason, Bosch Rexroth recommends that the
axial piston unit and system are always kept in a clean
condition.
Daily
Check axial piston unit for unusual noise development. Daily
Check fastener elements for tight seating.
All fasteners have to be checked when the hydraulic
system is switched off, depressurized and cooled down.
Monthly
10.3 Maintenance
The axial piston unit is low maintenance when used properly.
The service life of the axial piston unit is heavily dependent on the quality of the
hydraulic fluid. For this reason, we recommend changing the hydraulic fluid at least
once per year or every 2000 operating hours (which ever 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 by the service life of the bearings
fitted. The service life can be requested from the responsible Bosch Rexroth
Service partner, see chapter 10.5 “Spare parts” on page45. Based on these
details, a maintenance interval is to be determined by the system manufacturer for
the replacement of the bearings and included in the maintenance schedule of the
hydraulic system.
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