Possible faults Causes Possible remedies
Elevated temperature
during operation
Oil level in the gear unit housing too
high
● Check the oil level
● If required, correct the oil level
Oil is too old
● Check when the last oil change was done
● Change the oil if necessary
Oil is severely contaminated
● Change the oil
Oil supply system or cooling coil de‐
fective
● 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 oil cooling system:
Cooling liquid flow rate too low or
too high
● Fully open the valves in the intake and outlet pipes
● Check that water and oil can freely flow through the water-
oil cooler
Gear unit with oil cooling system:
The oil flow through the water-oil
cooler is too low.
● Check the oil filter and coarse filter
● If required, replace the oil filter or clean the coarse filter
Gear units with cooling coil: Depos‐
its 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
Defective oil pump
● Check the oil pump function
● If required, repair or replace the oil pump
Elevated temperature
at bearing points
Oil level in the gear unit housing too
low or too high
● Check the oil level at room temperature
● Correct the oil level if necessary
Oil is too old
● Check when the last oil change was done
● Change the oil if necessary
Oil supply system defective
● Inspect the oil supply system
● Replace defective components if necessary
● Read the operating instructions for the oil supply system
Defective rolling-contact bearings
● Contact Customer Services
● Inspect the rolling-contact bearings and replace if
necessary
Increased backstop
temperature with fail‐
ure of the blocking
function
Damaged backstop
● Contact Customer Services
● Check the backstop
● Replace, if necessary
Elevated vibration am‐
plitude at bearing
points
Defective rolling-contact bearings
● Contact Customer Services
● Inspect the rolling-contact bearings and replace if
necessary
Gear wheels defective
● Contact Customer Services
● Inspect the gear wheels and replace if necessary
Maintenance
8.4 Possible faults
REDUREX Gear unit 5200en
102 Operating Instructions 03/2019
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