ABB PME120-AI Service Instruction page 11

PME120-AI / PME120-AN (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/PME120-EN REV. A
In order to change the O-ring
output drive shaft proceed as follows:
1. Remove lever or coupling from the output shaft.
2. Make sure that the oil level is below the O-ring
3. If necessary, drain the oil (see Mounting position on page 6).
4. Remove the key 2 .
5. Loosen and remove the flange screws.
6. Two tap holes (thread size: M6) on the bolt circle for the
flange screws allow to use forcing screws; turn these screws
clockwise to remove the flange
forcing screws should be at least 25 mm.
7. Pull the flange 3 from the shaft.
8. Turn the forcing screws out.
9. Take the O-ring 1 and the sealing ring
10. Clean the shaft and the flange; slightly grease the sealing
ring.
11. Replace the O-ring and the sealing ring.
12. Cover the key groove in the shaft prior to the flange re-
installation in order to avoid any damage of the new sealing
ring.
13. Push the flange carefully over the shaft and fasten the flange
screws crosswise; tightening torque for the flange screws =
2.8 Nm (2.01 ft-lbs).
14. Remove key cover and re-install key
2 and sealing ring 4 of the
1 .
3 ; the thread length of the
2 out.
4 , lever or coupling.
1 Flange screws
2 Tap holes
Figure 10: Front view of shaft bearing flange
Note
Make sure that the 'open' side of the sealing ring points towards
the oil
1 Sealing ring
2 Flange
Figure 11: Flange and sealing ring / Use of auxiliary tool for sealing ring installation
(exemplary picture)
3 Sleeve (auxiliary tool)
11