Possible faults Causes Possible remedies
Oil is foaming in the
gear unit
Preservation agent not completely
drained off
● Change the oil
Oil supply system left in operation
for too long at low temperatures
● Switch off the oil supply system
● Degas the oil
Gear unit too cold in operation
● Switch off the gear unit
● Degas the oil
● Start up without cooling water during cold restart
Water in the oil
● Take test tube sample to examine oil condition for water
penetration
● Have the oil examined by a chemical lab
● Change the oil if necessary
Oil defoamer has run out
● Examine the oil
● Change the oil if necessary
Unsuitable mixture of oils
● Examine the oil
● Change the oil if necessary
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 screws if
necessary
Leaking pipes
● Check the pipes, and replace or seal if necessary
Oil supply system mal‐
function
-
● Read the operating instructions for the oil supply system
Servicing
8.4 Possible faults
Gear unit 5118en
Operating Instructions 10/2017 93
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