RE 51150-B/07.11 | Drive modules
Bosch Rexroth AG
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Troubleshooting
Impact of defect "D" Oil temperature too high
Table 13:
Fault
Possible causes
Remedy
1
Pump
Partial load operation of the machine, pump deliv-
ery volume cannot be adjusted in the case of fixed
displacement pumps
Check the hydraulic design after consulting with
Bosch Rexroth
2
Pressure valve
Incorrect setting of pressure valves - usually too
low. One part of the pump delivery volume flows
back to the tank via the pressure relief valves.
Check and, if necessary, correct the settings accord-
ing to the specifications in the circuit diagram
3
Heat radiation
Insufficient heat dissipation due to:
Too little oil in the tank
1.
Insufficient heat radiation due to encapsula-
2.
tion/ lack of ventilation
Check the oil level in the tank
1.
Provide for forced ventilation, if necessary
2.
4
Heat exchanger
For oil/air coolers:
The air flow is impaired, ambient temperature
too high
For oil/water coolers:
Too little flow of cooling water, temperature of
cooling water too high, too little cooling water in
the system, inlet pressure too low or deposits in
the heat exchanger
Check whether the coolants (air, water) comply with
the requirements of the technical specification
5
Other
Increased reduction in efficiency due to changed
conditions, also wear, if applicable
Perform maintenance work, replace components,
if necessary
Impact of defect "E": Polluted hydraulic fluid
Table 14:
Fault
Possible causes
Remedy
1
Particulate contamination
Deposition of dirt due to insufficiently cleaned
1.
components (e.g. piping) during installation
Deposition of dirt during filling of the hydrau-
2.
lic fluid
Deposition of dirt due to improperly under-
3.
taken maintenance and repair work
Ingress from the environment, e.g. via piston
4.
rods, pressure intensifiers, ventilation filters
Wear debris of components
5.
Determination of the causes
Rectification of the causes
Flushing the hydraulic system
Admissible cleanliness class, see data sheet
2
Water in the oil
Corrosion of the oil/water cooler due to water
1.
quality deviating from the material specifica-
tion of the heat exchanger
Pressure surges on the cooling water side
2.
Examination of the water quality, replacement of
1.
the heat exchanger if necessary
Solenoid water lock valves must only be ar-
2.
ranged in the supply line!
