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76/128 Commissioning
Flushing temperature
Flushing time
After flushing
Bosch Rexroth AG, CytroBox, RE 51057-B/11.19
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.
As per Bosch Rexroth recommendation, regular hydraulic fluid samples should be
taken during flushing 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 errors 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.
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