ABB IRB 6640 Product Manual page 142

3 Maintenance
3.3.7. Inspection, balancing device
Continued
Check for leakage - Design 1
The front ear of the balancing device is lubricated with grease. After filling, excessive grease
may normally be forced out between the shaft and the sealing ring in the sealing spacer. This
is normal behaviour and must not be confused with incorrect leaks from the ear.
Leaks at the o-rings and/or sealings, are not acceptable and must be attended to immediately
in order to avoid any damage to the bearing!
Check the o-rings in the front ear of the balancing device for leaks, as shown and detailed
below.
xx0700000111
A
B
C
D
140
Shaft
Sealing ring (radial) 2 pcs
O-ring
Sealing spacer
Action
1. Clean the area at the front ear from old grease.
2. Run the robot for some minutes, in order to
move the balancing device piston.
3. Check the o-rings at the front ear for leakage.
Replace the o-rings, if any leaks are detected.
Excessive grease from between the shaft and
the sealing ring is normal and is not considered
as a leak!
Note
The o-rings are included in the
Maintenance kit, bearings and seals,
already assembled with sealing
spacers and sealing rings.
Art. no. for the kit is specified in
Required equipment on page
The replacement of the complete
bearing is also detailed in section
Replacement of spherical roller
bearing, balancing device on page
292.
Continues on next page
3HAC026876-001 Revision: F
138.