36 Disassembly and assembly CR/EN (1004) 4.0
7.6 Mechanical seal
7.6.1 Instructions for mounting a cartridge seal
➢First read the following instructions regarding mounting a cartridge seal. Follow these
instructions closely when mounting a cartridge seal.
• This mechanical seal comes as a ’full cartridge seal’. This means that this mechanical
seal must be mounted as one single piece and that it shall NOT be taken apart!
• A cartridge seal is a fragile precision instrument. Leave the cartridge seal in its original
packing until you are ready to mount it!
• Clean all receiving parts properly. Make sure your hands and working environment are
clean!
7.6.2 Disassembling a cartridge seal
1 Re-fit the centering tabs on the cover of the seal cartridge into the groove in the seal
collar in order to immobilise the cartridge seal.
2 Disassemble the impeller, see paragraph 7.5.1 "Disassembling the impeller".
3 Remove the nuts (1810) and washers (1805) and pull the seal cartridge backwards
towards the bearing bracket (2100).
4 Remove the Allen screws (0850) and washer (0855) and knock the pump cover
loose from the bearing bracket.
5 Pull the entire seal cartridge from the pump shaft.
7.6.3 Mounting a cartridge seal
1 Put the bearing bracket in upright position (impeller side up).
2 Push the seal cartridge onto the pump shaft.
3 Mount the pump cover (0110) in the correct position in the fitting edge of the bearing
bracket (2100). Check whether the pump cover is at right angles to the pump
shaft. Place washers (0855) fasten the pump cover with Allen screw (0850).
4 Mount the seal cartridge to the pump cover (0110). Check the position in view of the
connection points. Place washers (0805) fasten the seal cartridge with nuts (0810).
5 Fit the impeller and other parts, see paragraph 7.5.2 "Mounting the impeller" and
paragraph 7.4.3 "Assembling the Back-Pull-Out unit".
6 Release the centering tabs of the seal cartridge, turn them halfway round and secure
them again against the seal cover. The shaft must now be able to rotate freely.