Oerlikon 10926, Operating Instructions Manual

Page: 30 / 44

30 GAET02307_002_10 - 06/2008 - © Œrlikon Leybold Vacuum
Maintenance
Remove four screws and take off the intake flange (7/57) and gasket (7/55).
Remove the spring and anti-suckback valve, and replace them if required.
If the anti-suckback valve closes too soon, carefully compress the spring
slightly. The top edge of the valve should be about 1-2 mm away from the
bottom side of the intake port.
Reassemble the spring with the correct orientation : small diameter to the
top. Do not screw the spring into the generator suction hole !
Reassemble the intake port. We recommend replacing the gasket (7/55) with
a new one.
The plane side of the anti-suckback valve faces downward.
Observe the safety regulations!
H. Checking the Float Valve
Tools required :
Open-jaw or box wrenches 10 mn, 13 mm, 17 mm.
If the pressure does not fall below approx. 5 mbar during pump operation,
check the tightness of the float valve and return line.
Remove the fastening screws at the top the of the pump-cylinder cover
(7/51a-52a), loosen the pump foot (7/94a) at the bottom of the cover and
take off the cover.
Take off the oil return line (6/11).
Remove the four screws (6/12) and pull the float valve assembly (6/10a) out
of the float chamber. Take off the gasket (6/9).
Clean the nozzle. Check the tightness of the float valve.
Check all gaskets and replace them with new ones if necessary.
Reassemble the float valve in the reverse sequence.
Observe the safety regulations!
I. Replacing the Exhaust Valve
Tools required :
Open-jaw or box wrenches 10 mm, 17 mm.
Drain the oil (6/5).
Remove the fastening screws at the top of the pump-cylinder cover (7/51a-
52a), loosen the pump foot (7/94) at the bottom of the cover and take off the
cover.
Disconnect the oil lines (6/11, 6/15 and 6/18).
Unscrew the nuts (6/19) and pull off the exhaust box.
Remove the gasket (6/22). Remove the screws and take off the valve stop
(6/21) and exhaust valve (6/20).
Reassemble in the reverse sequence.
Position the exhaust valve, so that its fingers bend toward the pumping module.
Observe the safety regulations!