14
6.3. Re-Setting The Silencer
If the silencer 13 is not functioning, a knocking noise
becomes audible at end vacuum. This does not cause
damage to the pump but it may be disturbing in quiet rooms.
Setting can be carried out while the pump is running and the
intake socket and gas ballast valve are closed, using a normal
screwdriver:
➡ The pump must have reached its operating temperature.
➡ Remove locking screw 46 (UNO 120A) or operating fluid
filler screw 42 (DUO 250 A).
➡ Using a screwdriver, open the valve spindle 47 approx. 3
turns (flushing) for some seconds and then close it again
completely (clockwise).
➡ Slowly open the valve spindle 47 (1/2 to a complete turn)
until the knocking noise is no longer audible.
➡ Replace locking screw 46 or operating fluid filler screw 42
paying attention to the O-ring.
42 46
Adjusting the silencer
42 Screw plug of the silencer (DUO 250 A)
46 Screw plug of the silencer (UNO 250 A)
Dismantling and cleaning the oil filter
1 Vacuum flange,
2 Exhaust flange,
42 Operating fluid filler screw
43 Operating fluid drain screw
44 Sight glass
45 Gas ballast valve, complete;
181 Ölfilter, komplett
183 Cover for filter cleaning
184 Screw (4 pieces)
185
186
187
188
189
190
205 42 184 183/ 1 2 45
191
44
43
181
185 Screw
186 Flange
187 Star-shaped filtering sieve
188 Spacer sleeve
189 Washer
190 Screw
191 O-ring
205 Screw plug for adjusting the silencer
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