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Bosch Rexroth AG
Drive modules | RE 51150-B/07.11
Maintenance and repair
Pressure values
10.2.4
The pressure values must be checked if the behavior of the drives changes
(e.g. cycle time extension, end product quality, etc). Otherwise, one control at
least every six months is recommended.
We recommend recording the pressure values within the scope of the
maintenance documentation.
Lead seals e.g. at the accumulator shut-off block provide information that the
original pressure setting has not been changed. Without attaining the set pres-
sure, the sealed valves cannot be checked within the scope of a normal inspec-
tion. The inspection here comprises a check to ensure the lead seals are intact.
If the lead seals are defective, contact the manufacturer.
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Oil maintenance
10.2.5
An oil analysis should be performed at least once per year.
An oil analysis entails drawing a sample of oil in a professional manner.
The oil sample must be checked in a qualified laboratory in accordance with
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the hydraulic fluid manufacturer's specifications.
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Carry out more measures according to the results, e.g.:
Additional filtration (measures)
–
Dehydrogenation
–
Exchange
–
Do not use reconditioned oil (recovered oil).
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In case of an oil change, drain the hydraulic fluid completely (in this connec-
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tion see also Chapter 11.1 "Preparing for decommissioning").
In this connection, ensure complete draining of the lines and actuators.
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If necessary, carry out ventilation measures.
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Fill the hydraulic system and subsequently bleed it, as with the initial filling.
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Hydraulic accumulator
10.2.6
There are legally prescribed inspections for accumulators, which have to be
undertaken at defined intervals. This is the responsibility of the operator.
In order for the accumulator to function as intended, the gas pre-charge is to be
checked periodically according to the information in the circuit diagram.
Regarding the maintenance of hydraulic accumulators, you should observe
the relevant stipulations of ISO 4413 (Chapter 7.3.2.2) in its current version,
as well as those in the operating instructions of the accumulator manufacturer.
The essential maintenance required for hydraulic accumulators entails the
verification and setting of the gas filling pressure.
For this purpose, only the testing and filling equipment and procedures may be
used, which are recommended by the manufacturer for filling accumulators.
Select the gas filling pressure depending on the gas temperature.
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lead seals
Maintenance, repair
Gas filling pressure
