2 BO 70 en
15
3.
Loosen the hexagon head screws (306). (
see Figure 20-Figure 21).
Figure 19
Loosen the screws
Figure 20
4.
Demount the retaining ring (301). (see Figure 22).
Fig. 21
Demount the retaining ring
5.
Now you can remove the o-ring (320).
(Figure 23)
Figure 22
Remove Pos.320
6.
Before replacing the o-ring, you must clean all parts
with care and diligence.
7.
Before reassembly, check all parts for traces of wear.
Use Oxigenoex S4 for the hexagon head screws on the
thread of the screws. (See Figure 24-Figure 25)
Figure 23
Figure 24
8.
Check the high performance disc valve for its tightness
and smooth operation before rere-installation. Instruc-
tions for installation are in Chapter 3.
11.6
Replacing wear parts
In order to replace the wear parts, proceed as follows:
1.
Remove the actuator by loosening the hexagon head
screws (502).
2.
Swivel the disc 180°to demount the sealing element
(320), as shown in section 11.5.
3.
Now you have free access to the clamping discs (444),
retaining plates (447) and hexagon head screws (448),
which you can now loosen.
4.
Demount the cover (430) on the backside of the valve.
Now you can remove the thrust bearing (404), shaft
(402) and bearing bushing (410).
5.
On the front side (actuator side), remove the flange
(453). Now you can remove the thrust bearing (404),
shaft (401) and bearing bushing (411).
6.
Now you have free access to all bearings and sealing
elements of the shafts.
