ABB IRB 2000 - Page 20

1.3 Cautions
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1. The mechanical unit contains several parts which are too heavy to lift manually. Since,
in process of repair, these parts must be moved with precision, it is important to have a
suitable lifting device available.
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2. The robot should always be switched to MOTOR OFF before anyone goes inside its
working area.
14 Mounting Instructions for Bearings and Seals
1.4.1
Bearings
1. Let a new bearing remain in its wrapping until the mounting work shall take place
to avoid contamination of the bearing.
2. Ensure that all parts comprising the bearing fitting are free from burrs, grindings
and other contaminations. Cast details must be free from foundry sand.
3. Bearing rings, races and roller elements must under no circumstances be subjected
to direct impacts. Also, the roller elements must not be exposed to any forces deve-
loped during the assembly work.
Tapered Bearings
4. The tensioning of the bearing shall be gradually applied until the recommended
pretension is achieved.
5. Itis important to note that the roller elements must be rotated a specified number
of turns before the pretensioning is carried out and also rotated during the
pretensioning sequence.
6. The above procedure must be carried out to enable the roller elements to adjust into
correct position against the racer’s flange.
7. Also, it is important that the positioning of the bearing is properly carried out as
this directly will affect the lifespan of the bearing.
Greasing of Bearings
8. The bearing shall be greased after mounting. The main reason for this is the
requirement for cleanliness. Lubricating grease of a good quality shall be used, for
example 1171 4012-201.
9. Groove ball bearings shall be filled with grease from both sides.
10. Tapered roller bearings and axial needle bearings shall be greased in split condition.
Mechanical repair IRB 2000