21
Maintenance
7.3
Cleaning the gas ballast valve
Gas ballast valve only becomes dirty if dusty ambient air issucked in.
Î
Unscrew screw 74.4 (standard version).
Î
Remove gas ballast head 74.5. Be careful with O-rings 74.14 and 74.18 (standard
version).
Î
Unscrew two screws 74.22 (74.23 C version).
Î
Remove gas ballast flange 74.2 (74.7 C version); take care with O-rings 74.18 and
74.20.
Î
Unscrew screw 74.26, remove washer 74.32 and plate spring 74.6.
Î
DC-Version: remove circlip 74.34.
Î
Unscrew spindle 74.8 with O-rings 74.10 and 74.12.
Î
Unscrew hose nozzle 74.9 with O-ring 74.16.
Î
Clean nozzle opening in gas ballast flange 74.2 (74.7 C version).
Î
Check plate spring 74.6 and replace if necessary.
Î
Unscrew silencer screw 74.3; be careful with O-ring 74.12.
Î
Unscrew 2 screws 184 from gas ballast valve housing 74.1, take care with O-
rings 232 and 238.
Î
Clean all parts and, if necessary, replace defective parts or gas ballast valve com-
plete.
Î
Assembly in reverse order.
Fig. 14: Gas ballast valve standard version 74, PK 223 664-U
74.1 Gas ballast valve housing
74.2 Gas ballast flange
74.3 Silencer screw
74.4 Special screw
74.5 Gas ballast knob
74.6 Plate spring
74.12O-ring
74.14O-ring
74.18O-ring
74.20O-ring
74.22Screw
74.26Screw
74.30Guide pin
74.32Washer
184 Screw
232 O-ring
238 O-ring
74.22 74.20 184 74.18 74.3
74.12
74.14
74.4
74.18
74.5
74.2
232
74.1
238
74.26
74.32
74.30
74.6
