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Error
Drive overtemperature
Hydraulic fluid temperature
too high
Increased filter
contamination
Filling and breathing filter
contaminated
Filling level not in the
specified range
Hydraulic fluid viscosity
too high
Possible cause
Insufficient cooling water flow, cooling
water temperature too high, insufficient
cooling water in the system, inlet pressure
too low or deposits in the heat exchanger
Insufficient cooling power of hydraulic
fluid.
Faulty and usually too low pressure valve
setting; part of the pump delivery volume
flows back to the oil tank via the pressure
relief valves.
External heat input into the hydraulic fluid.
Insufficient cooling water flow, cooling
water temperature too high, insufficient
cooling water in the system, inlet pressure
too low or deposits in the heat exchanger
Increased efficiency losses due to changed
conditions including wear.
Deposition of dirt due to insufficient
cleaning of components during installation.
Deposition of dirt during filling of
hydraulic fluids.
Abrasion at components
Contaminated ambient air
Leakage
Oscillating volume too high
Water ingress
Insufficient hydraulic fluid temperature or
viscosity class too high
Troubleshooting | CytroPac
Remedy
▶ Make sure that the coolant complies with the
requirements of the technical specifications.
▶ Calculate the heat introduction in the
hydraulic system, e.g. by calculation
of the hydraulic power loss of valves,
rotary transmission leadthrough, etc.
▶ Compare the results with the selected oil
cooling power of the hydraulic power unit.
▶ Increase the cooling water flow or replace
the hydraulic power unit against a model with
higher oil cooling power.
▶ Make sure that the pressure relief valve is set
10 % over the operating pressure.
▶ Check whether external heat sources are
positioned too close to the hydraulic system.
▶ If necessary, separate the heat sources from the
hydraulic system.
▶ Make sure that the coolant complies with the
requirements of the technical specifications.
▶ Carry out maintenance work and replace
affected components as necessary.
▶ Flush the hydraulic system.
▶ Fill the hydraulic system via a filling unit with
integrated filter.
▶ Make sure that all components are operated
according to their specifications.
▶ Clean or replace breathing filter, see Table 19
"Spare and wear parts".
▶ Check and correct the cause for the loss of
hydraulic fluid.
▶ If necessary, refill hydraulic fluid
(also refer to the error "Pressure fluctuations
in the pressure line").
▶ Make sure that the sum of the required
oscillating volume of the plunger or differential
cylinder complies with the specifications of the
hydraulic power unit.
▶ Check the function of the externally installed
heat exchanger.
▶ Increase the temperature of the hydraulic power
unit before starting the machine function.
▶ If necessary, use hydraulic fluid with a lower
viscosity class.
RE 51055-B, Edition 07.2022, Bosch Rexroth AG
71/80
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