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4. Maintenance 4.5 Primary seals removal and fitting
4.5.2 R90 Single flushed/quench mechanical seal
12
Item Description
1 Stationary seal ring O-ring
2 Stationary seal ring
3 Rotary seal ring
4 Rotary seal ring O-ring
5 Wave spring
6 Drive ring
7 Spacer O-ring
8 Spacer
9 Gasket
10 Seal housing
11 Lip seal
12 Grub screw
Seal removal:
1. Turn off the flush and disconnect the flushing pipework.
2. Loosen screws (12) through the flushing connections.
3. Remove seal housing nuts and separate housing (10) from rotorcase.
4. Remove rotorcase.
Extract stationary seals (2) from rotorcase and rotary seal (3) from the shaft.
5. Remove seal housing (10), lip seal (11) and spacer (8).
Seal fitting:
1. Lightly lubricate O-rings (4 and 1) and fit to rotary and stationary seals (3 and 2).
2. Lubricate and fit O-rings (7) to spacers (8) and fit to shafts.
3. Fit new lip seals (11) to seal housings (10) and locate over spacers.
4. Fit rotary seals to shafts and stationary seals to rotorcase.
5. Wipe clean the sealing faces with solvent.
6. Fit new seal housing gasket (9).
7. Refit rotorcase.
8. Locate seal housing and tighten nuts.
9. Tighten screws (12) through the flushing connections.
