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8.1.6 Flushing the hydraulic system
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Preparations:
Required material
• Provision of replacement or flushing filter elements
• If required: Provision of additional pipeline and hose material for flushing and
short-circuit links
• Provision of flushing plates, alternative directional valves
• As applicable: Provision of flushing fluid (see information below)
The same medium can be used as in later operation of the hydraulic system.
Information on
flushing fluid
If a different hydraulic fluid is used, it must be compatible with the operating
medium intended for the hydraulic system and with materials and particularly the
seals used in the hydraulic system. A maximum admissible residual amount
(e.g. 0.5 percent by volume) of flushing fluid in the operating medium can be defined
(see manufacturer's specifications). In this case, it must be ensured by thorough
draining of the flushing fluid prior to filling with operating medium.
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!
Flush the hydraulic system to achieve a defined cleanliness of the hydraulic fluid.
This prevents faults and simultaneously increases the life cycle of the components.
Make sure that the minimum requirements of the cleanliness class for the
components are fulfilled after installation of the hydraulic power unit into the
machine and after integration into the hydraulic system.
Hydraulic systems in general industrial applications require a cleanliness class of
20/18/15 according to ISO 4406. Hydraulic systems with servo valve or
sophisticated high-response valves have even stricter requirements regarding the
cleanliness class, e.g. 19/16/13.
Observe the cleanliness requirement of the components according to the
manufacturer data sheets for definition of the targeted condition after flushing.
In case of comprehensive hydraulic systems with ring and branch lines,
detailed planning of the flushing procedure and thorough processing is required.
Commissioning 75/128
CytroBox, RE 51057-B/11.19, Bosch Rexroth AG
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