Common Faults During Commissioning; Re-Commissioning After Longer Standstill - Bosch Rexroth CytroPac Operating Instructions Manual

Flushing temperature
Flushing time
After flushing
In case of comprehensive hydraulic systems with ring and branch lines, detailed
planning of the flushing procedure and thorough processing is required.
The following instructions refer to flushing with the hydraulic power unit described
in these operating instructions.
For use of a separate flushing unit, the respective operating instructions must be
observed!
For flushing, the hydraulic power unit is to be set to operating temperature and
operated at reduced pressure. Please note that any pressure control circuits must be
deactivated during the flushing phase or prepared for low flushing pressures.
No general statement can be made on the duration of the flushing process.
During flushing, regular hydraulic fluid samples should be taken and analyzed for
cleanliness. A suitable sampling point is the return line upstream of the return flow
filter.
Based on the result, it is to be decided whether flushing can be stopped (target
cleanliness reached) or must be continued.
After completion of the flushing process, the operating conditions of the hydraulic
power unit must be restored, flushing connections removed and connections closed
pressure-tight.

8.1.7 Common faults during commissioning

• The oil tank is not checked.
• Hydraulic fluid is filled without filtering.
• The hydraulic system is not bled properly.
• Pressure relief valve set with insufficient difference to the operating pressure
(closing pressure difference not observed).
• The switching hysteresis of pressure switches is not observed for setting.
• Parameter changes from the condition as supplied of the hydraulic power unit,
e.g. operating pressure, are not documented.

8.2 Re-commissioning after longer standstill

For re-commissioning after longer standstill, proceed as follows:
▶ Check:
– the hydraulic fluid level
– hydraulic components and line systems for tightness
▶ Switch on components with increased caution.
▶ Bleed the hydraulic system.
▶ Observe the information in the operating instructions of the machine/system
manufacturer.
Commissioning
CytroPac, RE 51055-B/06.17, Bosch Rexroth AG
49/84