5 Maintenance
This page is not applicable for ATEX applications.
For ATEX application see ATEX addendum
5.5 Primary seals removal and fitting
5.5.1 R90 Single mechanical seal
Mechanical seals are fragile. Take extreme care when handling.
Clean components before fitting, checking there is no damage
to sealing faces. New elastomeric parts should be fitted during
assembly.
Rotor
Shaft
Setting dimension
Setting Dimension
Pump
mm
in
Item
Description
SRU1 33.6 1.32
71
Stationary seal ring O-ring
SRU2
35.6 1.40 72
Stationary seal ring
SRU3 38.1 1.50 73
Rotary seal ring
SRU4
39.6 1.56
SRU5
47.6 1.87
SRU6
50.7 2.00
74
Rotary seal assembly comprising of rotary seal ring,
washer (98), wave spring (99), drive ring (100) and
grub screw (78)
Seal removal
1. Remove rotorcase cover, rotors and rotorcase.
2. Extract the stationary seal ring (72) and O-ring (71) from the rotorcase.
3. Loosen the grub screws (78).
4. Remove the rotary seal assembly (74) from the shaft.
5. Remove abutment spacer if fitted.
6. Extract the rotary seal O-ring (73) from the rotary seal assembly.
Seal fitting
1. Mark the shaft to indicate the seal setting length, shown in table above.
2. Lightly lubricate O-rings (71) with appropriate grease and fit to stationary seals (72).
3. Press the stationary seal rings into the rotorcase seal bores by aligning cut outs with the anti-rotation pins.
4. Wipe clean the stationary seal faces with solvent.
5. Lightly lubricate shafts and if fitted, replace seal abutment spacers pressing them over shafts against the shaft shoulder.
6. Lightly lubricate O-rings (73) and fit to rotary seal ring (74).
7. Adjust rotary seal assembly grub screws (78) to ensure that screws do not foul on shafts when fitted.
8. Slide rotary seal assembly on to the shafts until aligned with the setting dimension mark.
9. Tighten the grub screws to the recommended torque figure in table 6.1.3.
10. Wipe clean the rotary sealing faces with solvent.
11. Refit the rotorcase, rotors and front cover.
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