Oil And Grease Stains On Motors And Gearboxes - ABB IRB 920 Product Manual

7.2 Oil and grease stains on motors and gearboxes

Description
The area surrounding the motor, gearbox or seal lip shows signs of oil leaks. This
can be at the base, closest to the mating surface, at the furthest end of the motor
at the resolver, or around the joints of the covers (closest to the edge) on the robot
surface.
Consequences
Besides the dirty appearance, in most cases there are no serious consequences
if the leaked amount of oil is very small.
Possible causes
The symptom can be caused by:
Recommended actions
The following actions are recommended:
1
2
3
4
5
Product manual - IRB 920
3HAC075721-001 Revision: C
• Leakage of rust preventives or mounting grease. This should be wiped off.
• Leaking sealing between gearbox and motor.
• Gearbox overfilled with oil.
• Gearbox oil too hot.
Action
CAUTION
Allow hot parts to cool down.
Wipe off the oil or grease, see
920 on page 108.
Monitor the robot over time to see if new oil or
grease occurs.
Check the gearbox oil level.
Too hot gearbox oil may be caused by:
• Incorrect oil quality or level.
• The robot work cycle runs a specific axis
too hard. Investigate whether it is possible
to program small "cooling periods" into the
application.
• Overpressure created inside gearbox.
Inspect all sealings and gaskets between motor
and gearbox. Replace broken parts.
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7.2 Oil and grease stains on motors and gearboxes
Information
Cleaning the IRB If the oil spill is small, this step is
sufficient.
Robots performing certain, ex-
tremely heavy duty work cycles
may be fitted with vented oil plugs.
These are not fitted to normal duty
robots, but can be purchased from
your local ABB representative.
7 Troubleshooting
979