ABB RHD Series - Sealing Ring of Output Drive Shaft

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 11
Sealing ring of output drive shaft
A
Drive pinion
B
Output shaft
C
Handwheel mechanism
D
Motor
E
Brake
Figure 7: Sectional view of PME120
The following general explanations for the sealing ring
replacement do not exclusively apply for the output shaft but
also for the other sealing rings.
In order to change the O-ring
2 and sealing ring 4 of the
output drive shaft proceed as follows:
1. Remove lever or coupling from the output shaft
5.
2. Make sure that the oil level is below the O-ring
2.
3. If necessary, drain the oil (see Mounting position on
page 6).
4. Remove the key
6.
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
3; the thread length of the
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 2 out.
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
4, lever or coupling.
Note
Make sure that the ‘open’ side of the sealing ring points towards
the oil
1
Sealing ring
2
Flange
3
Sleeve (auxiliary tool)
Figure 8: Flange and sealing ring / Use of auxiliary tool for sealing ring installation
(exemplary picture)