Bosch rexroth A21VG 10 Series - Running-in phase; Recommissioning after standstill

42/56 Commissioning
Bosch Rexroth Corporation, A21VG Series 10, RE 93223-01-B/09.2020
8.2 Running-in phase
NOTICE
Damage to equipment by insufcient viscosity!
An increased hydraulic uid 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 case drain temperature.
▶ Reduce the loading (pressure, rpm) 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 efciency 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 uid specimen analyzed for the
required cleanliness level.
▶ Change the hydraulic uid if the required cleanliness level is not reached. If
a laboratory test is not carried out after the running-in phase, Bosch Rexroth
recommends the hydraulic uid be changed.
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 uid
• Other contamination
▶ Before recommissioning, proceed as described in chapter 8.1 “Initial
commissioning” on page 39.