Commissioning 51/68
RE 92003-01-B/12.2015, A4VG Series 32, Bosch Rexroth AG
8.2 Running-in phase
NOTICE
Property damage from insufficient viscosity.
An increased hydraulic fluid temperature may reduce the viscosity values by too
much and damage the product.
▶ Monitor the operating temperature during the running-in phase, e.g., by
measuring the leakage temperature.
▶ Reduce the loading (pressure, rotational speed) of the axial piston unit if
impermissible operating temperatures and/or viscosities occur.
▶ Operating temperatures that are too high indicate faults that have to be
analyzed and cleared.
The bearings and sliding surfaces are subject to a running-in phase. The increased
friction at the start of the running-in phase results in increased heat development
which decreases with increasing operating hours. The volumetric and mechanical-
hydraulic efficiency also increases up to the conclusion of the running-in phase of
approx. 10 operating hours.
To ensure that contamination in the hydraulic system does not damage the axial piston
unit, BoschRexroth recommends the following procedure after the running-in phase:
▶ After the running-in phase, have a hydraulic fluid sample analyzed for the required
cleanliness level.
▶ Change the hydraulic fluid if the required cleanliness level is not reached. If a
laboratory test is not carried out after the running-in phase, it is recommended to
change the hydraulic fluid.
8.3 Recommissioning after standstill
Depending on the installation conditions and ambient conditions, changes may occur
in the hydraulic system which make recommissioning necessary.
Among others, the following criteria may make recommissioning necessary:
• Air and/or water in the hydraulic system
• Old hydraulic fluid
• Other contamination
▶ For recommissioning, proceed as described in Chapter8.1 “Initial
commissioning” on page48.
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