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Measures if the
maximum filling level
is exceeded:
Measures if the
minimum filling level is
fallen below:
Possible causes for
temperature increase:
10.5.2 Monitoring the filling level
1. Expansion due to temperature increase
(rough determination: delta V = thermal expansion coefficient x delta T)
– Correct the filling level
2. Exceeding of the maximum filling level due to presumed water ingress
– Close water valves (locking of the cooling water supply)
– Take an oil sample from the bottom of the oil tank and check it for water content
– If water ingress is confirmed, finish the working cycle of the machine and put it
out of operation under safe conditions
– Carry out additional control measures and take the following measures
depending on the results:
– Correct the cause of the water ingress
– Clean or drain and change hydraulic fluid
– If necessary, flush the system
– Check the hydraulic fluid for its admissible water content
– Identify and correct the cause of the leakage
– Afterwards, fill in hydraulic fluid to the correct filling level
– Note the oscillating volume
10.5.3 Monitoring the oil temperature
Possible causes for temperature increase include:
• Heat exchanger malfunction
• Change in cooling water conditions
• Circulating pump for oil cooling defective
• Malfunction or incorrect setting of pressure valves
(e.g. maximum pressure limit, pump control, pressure reducing valve)
• Error at the pump (wear, increased leakage)
• Changed environmental conditions (e.g. increased ambient temperature)
• Changed load conditions at drives
In case of inadmissible temperature increases, the causes must be determined
and corrected.
Maintenance and repair 101/128
CytroBox, RE 51057-B/11.19, Bosch Rexroth AG
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