8 Trouble Shooting
8.3 Fault Symptoms and Malfunctions
188 3HNA009834-001 en Rev.06 Product Manual, Control Cabinet IRC5P
8.3.14 Oil or Grease Stains on Motors and/or Gearboxes
Description The area surrounding the motor or gearbox shows signs of oil leaks. This may be at
the base, closest to the mating surface, or at the furthest end of the motor at the
resolver.
Consequences Except for the dirty appearance, in some cases there are no serious consequences.
However, in some cases the leaking oil lubricates the motor brake, causing the
manipulator to collapse at power-down.
Possible Causes The symptom may be caused by (the causes are listed in order of probability):
• Leaking seal between gearbox and motor.
• Gearbox overfilled with oil.
• Gearbox oil too hot.
Recommended Actions
CAUTION! Parts of the manipulator may be hot and care must be taken to avoid
touching these components before they have been allowed to cool down.
Step Action Comment
1 Inspect all seals and gaskets between motor
and gearbox. The different manipulator models
use different types of seals.
Replace seals and gaskets. See
‘Product Manual, Manipulator’.
2 Check the gearbox oil level. Correct oil level . See ‘Product Manual,
Manipulator’.
3 Too hot gearbox oil may be caused by:
– Oil quality or level used is incorrect.
– The robot work cycle runs a specific axis too
hard. Investigate whether it is possible to
program small ‘cooling periods’ into the
application.
– High pressure created inside gearbox.
Check the recommended oil level and
type. See ‘Product Manual, Manipulator’.
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