Seite 13 von 72 // page 13 of 72
Das Dokument darf nur vollständig und unverändert verwendet und weitergegeben werden. Es liegt in der Verantwortung des
Anwenders, die Gültigkeit dieses Dokumentes bezüglich seines Produktes sicher zu stellen.
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product.
- Remove oil pump rotor with oil pump vanes.
- Remove low vacuum stage stator with oil separator.
- Remove intermediate bearing plate, high vacuum stage stator, high vacuum rotor and bearing plate
(only RZ 2/5).
Cleaning parts
- Check through bores of the oil lines, clean if necessary.
- Check all seal rings for conglutination and cracks, replace if necessary.
- Check silencer nozzle, clean if necessary.
- Remove threaded plug of the detent ball in the bearing cover. Remove and check detent ball with
spring, replace if necessary.
- Remove oil separator upper and lower part.
- Check valve cap, spring and valve seat. Replace valve cap and spring if necessary.
Changing the coupling bushes
- Check coupling bushes in the rotors, replace if necessary.
- Remove bushes (e. g. by using a woodscrew). Press in flush new coupling bushes.
Changing the shaft seals
- Check shaft seals in the bearing plate, intermediate bearing plate and bearing cover and replace if
necessary.
- Remove shaft seal from housing by using an appropriate mandrel (special tool, see below).
- Press in new shaft seal, make sure that it remains level to bore.
- Assemble shaft seals only by using a special mandrel (see table and drawings). Apply pressure only to
the outer ring. Take into consideration that the mandrel will pass under the seal and ensure that no
other part can be damaged.
Assembly of the pump
- Assemble pump in reverse order of disassembling.
- Lubricate all wear faces with pump oil.
- Install new O-rings, stretch slightly to seat if necessary.
- Place oil pump rotor with rounded face first in bearing cover.
- Fill in vacuum oil into the oil pump before assembling oil pump vanes.
- Position oil pump cover so that the internal half-round groove is directed right to the detent ball.
- Position the complete assembled pump unit in the oil reservoir and screw together with housing.
- Assemble removable sleeve.
- Fill half of the chamber in front of the removable sleeve with pump oil.
- Position shielding with O-ring.
- Lubricate the coupling using vacuum grease.
- Attach the winding on the top of the housing then place on top the rotor with coupling. The coupling
glides through the removable sleeve. Alternatively assemble the motor complete with coupling, turn
the fan to position the coupling pins suitably if necessary.
- Screw motor to housing.
- Check operability of the pump unit by turning the impeller.
- Assemble fan cover.
- Fill in pump oil (see ”Oil change” in the instruction for use).
- Allow the pump to run with gas ballast valve open and inlet closed for approx. 1 h.
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