21.Continue the assembly process by following the instructions outlined in Bearing and
bearing housing assembly on page 79.
MR1 & MR3 Mechanical seal on sleeve assembly instructions
1. Place the impeller hub gasket against the impeller hub. Ensure the gasket sits flush
against the hub.
2. Slide impeller hub sleeve against impeller hub. Ensure the keyway slot within the
impeller hub sleeve aligns with the impeller keyway. Ensure the end of the impeller
hub sleeve that has a filet faces away from the impeller. Otherwise, sharp sleeve edges
may destroy the sleeve O-ring and ruin the sleeve’s seal.
3. Place sleeve O-ring onto shaft adjacent to impeller hub sleeve.
4. Lightly grease the stuffing box O-rings and place them into their respective grooves
along the outer diameter of the stuffing box. Thread in the plug at the top of the
stuffing box.
5. Slide the stuffing box onto the shaft until it rests against the impeller hub sleeve.
6. Place the mechanical seal’s rotating element on the shaft sleeve. Tighten the set
screws on the drive ring at the inscribed location on the shaft sleeve.
Note: The drive ring should be set before the inscribed line such that the entire
mechanical seal is located between the inscribed line and the seal gland.
7. Slide the non-keyed end of the shaft sleeve, with the rotating element installed, onto
the shaft until it sits against the impeller hub sleeve.
8. Insert the heterotype key between the shaft sleeve and shaft.
9. Slide tab washer onto the shaft against the shaft sleeve.
10.Thread the locknut onto the shaft. Align tab washer prongs with sleeve nut gaps. Bend
tab washer prongs over the sleeve nut gaps to secure the locknut.
6 Maintenance
70 e-XC INSTRUCTION MANUAL
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