7 Servicing/Maintenance
52 of 82
Amarex
2573.820/02-EN
CAUTION
Improper reassembly
Damage to the pump!
▷ Reassemble the pump (set) in accordance with the general rules of sound
engineering practice.
▷ Use original spare parts only.
NOTE
Before reassembling the motor section, check that all joints relevant to explosion
protection (flamepaths) are undamaged. Any components with damaged
flamepaths must be replaced. Refer to the "Flamepaths" annex for the position of
the flamepaths.
Sequence Always reassemble the pump set in accordance with the corresponding general
assembly drawing.
Sealing elements ▪ O-rings
– Check O-rings for any damage and replace by new O-rings, if required.
▪ Assembly adhesives
– Avoid the use of assembly adhesives, if possible.
Tightening torques For reassembly, tighten all screws and bolts as specified in this manual.
7.5.2 Reassembling the pump section
7.5.2.1 Installing the mechanical seal
▪ The shaft surface must be absolutely clean and undamaged.
▪ Immediately before installing the mechanical seal, wet the seal faces with a drop
of oil.
▪ For easier installation of the bellows-type mechanical seal, wet the inside
diameter of the bellows with soapy water (not oil).
▪ To prevent any damage to the rubber bellows, place a thin foil (of approximately
0.1+/-0.3mm thickness) around the free shaft stub.
Slide the rotating assembly over the foil into its installation position. Then
remove the foil.
ü The shaft and rolling element bearings have been properly fitted in the motor.
1. Push drive-end mechanical seal 433.01 on shaft 210 and secure it with circlip
932.03.
2. Insert O-ring 412.15 into discharge cover 163. Press the discharge cover into
casing 100. Then fasten discharge cover 163 with screws 914.74.
3. Guide the pump-end mechanical seal 433.02 onto shaft 210.
For special mechanical seals with covered spring, tighten the socket head cap screw
at the rotating assembly before fitting the impeller. Observe installation dimension
A.
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