Running-In Phase; Recommissioning After Standstill - Bosch REXROTH A4 Series Instruction Manual

8.2 Running-in phase

Property damage by 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 eliminated.
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 increases as well through 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, Bosch Rexroth 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 system which make recommissioning necessary.
Among others, the following criteria may make recommissioning necessary:
• Air in the hydraulic system
• Water in the hydraulic system
• Old hydraulic fluid
• Other contamination
▶ For recommissioning, proceed as described in chapter 8.1 "Initial commissioning"
on page 61.
RE 92076-01-B/10.2017, A4... with HS5E pilot control valve/Series 3x, Bosch Rexroth AG
NOTICE
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