General Description Repairs
6 Product Manual IRB 640
1.2 Caution
The mechanical unit contains several parts which are too heavy to lift manually. As
these parts must be moved with precision during any maintenance and repair work, it
is important to have a suitable lifting device available.
The robot should always be switched to MOTORS OFF before allowing anyone to
enter its working space.
1.3 Mounting Instructions for Bearings and Seals
1.3.1 Bearings
1. Let a new bearing remain in its wrapping until it is time for fitting, to avoid contamina-
tion of the bearing.
2. Ensure that all parts included in the bearing fitting are free from burrs, grinding
waste and other contamination. Cast components must be free from foundry sand.
3. Bearing rings, inner rings and roller elements must under no circumstances be
subjected to direct impact. Also, the roller elements must not be exposed to any
stresses during the assembly work.
Tapered Bearings
4. The bearing should be tensioned gradually until the recommended pre-tension is
achieved.
5. It is important to note that the roller elements must be rotated a specified number of
turns before pre-tensioning is carried out, and also rotated during the pre-tensioning
sequence.
6. The above procedure must be carried out to enable the roller elements to adjust to
the correct position against the race flange. Also, it is important that the bearing
is properly aligned, as this will directly affect the lifespan of the bearing.
Greasing Bearings
7. The bearing must be greased after fitting. The main reason for this is the requirement
for cleanliness.
8. Grooved ball bearings should be filled with grease from both sides.
9. Tapered roller bearings and axial needle bearings shall be greased in the split condition.
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