Servicing
8.4 Possible faults
A5850-02en Edition 06/2022 93
Possible faults Causes Possible remedies
Oil escaping from the
gear unit
Inadequate sealing of the housing
cover or joints
• Check the seals and replace if necessary
• Seal housing cover or joints
• Check the compression seals and retighten bolts if ne-
cessary
Defective rotary shaft sealing rings • Inspect the rotary shaft sealing rings and replace if ne-
cessary
Oil supply system mal-
function
- • Read the operating instructions for the oil supply system
Gear change mechan-
ism malfunction
- • Contact Customer Service
• Inspect the gear change mechanism and replace if ne-
cessary
Elevated temperature
during operation
Oil level in the gear unit housing
too high
• Check the oil level
• Correct the oil level if necessary
Oil is too old • Check when the last oil change was performed
• Change the oil if necessary
Oil is severely contaminated • Change the oil
Oil supply system or cooling coil
defective
• Check the oil supply system or cooling coil
• Replace defective components if necessary
• Read the operating instructions for the oil supply system
Gear unit with cooling coil: Deposits
in the cooling coil
• Clean or, if necessary, replace the cooling coil
For gear units with fan: Air intake
opening in air guide cover or gear
unit housing is soiled
• Clean the air guide cover and gear unit housing
Coolant temperature too high • Check the temperature
• Correct the temperature if necessary
Elevated temperature
at bearing points
Oil level in the gear unit housing
too low or too high
• Check the oil level at room temperature
• Top up with oil if necessary
Oil is too old • Check when the last oil change was performed
• Change the oil if necessary
Oil supply system defective • Check the oil supply system
• Replace defective components if necessary
• Read the operating instructions for the oil supply system
Defective rolling-contact bearings • Contact Customer Service
• Inspect the rolling-contact bearings and replace if neces-
sary
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