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7 Servicing/Maintenance
4. Use forcing screws 901.30 (for bolted casing covers) or 901.31 (for clamped
casing covers) to remove the back pull-out unit from its seat in the volute casing.
Pull the back pull-out unit completely out of the volute casing.
5. Remove and dispose of gasket 400.10.
6. Place the back pull-out unit on a clean and level surface.
7.4.5 Removing the impeller
ü The notes and steps stated in (ð Section 7.4.1, Page 37) to
(ð Section 7.4.4, Page 38) have been observed/carried out.
ü The back pull-out unit has been placed in a clean and level assembly area.
1. Bend open lockwasher 931.
2. Undo impeller nut 920.95 (right-hand thread).
3. Remove lockwasher 931. (For shaft unit 25 also remove disc 550.95.)
4. Remove impeller 230 with an impeller removal tool.
5. Place impeller 230 on a clean and level surface.
6. Remove keys 940.01 and 940.09 (if any) from shaft 210.
7.4.6 Removing the shaft seal
7.4.6.1 Removing a single mechanical seal
ü The notes and steps stated in (ð Section 7.4.1, Page 37) to
(ð Section 7.4.5, Page 39) have been observed/carried out.
ü The back pull-out unit has been placed in a clean and level assembly area.
1. Remove the rotating assembly of the mechanical seal (primary ring) from shaft
sleeve 523.
2. Undo nuts 920.15 (if any) at casing cover 161.
3. For models with clamped casing cover: Undo transport locks 901.98 and remove
cover plates 81-92.01 and 81-92.02 with transport locks 901.98 and lock washers
554.98. Remove casing cover 161 from bearing bracket 330.
For models with bolted casing cover: Use forcing screws 901.31 to remove
casing cover 161 from bearing bracket 330.
4. Remove the stationary assembly of the mechanical seal (mating ring) from
casing cover 161.
5. Pull shaft sleeve 523 off shaft 210.
6. Remove and dispose of gasket 400.75.
7.4.6.2 Dismantling the gland packing
ü The notes and steps stated in (ð Section 7.4.1, Page 37) to
(ð Section 7.4.5, Page 39) have been observed/carried out.
ü The back pull-out unit has been placed in a clean and level assembly area.
1. Undo nuts 920.02 at the gland follower and loosen gland follower 452.
2. Undo nuts 920.15 (if any) at casing cover 161.
3. For models with a clamped casing cover: Undo transport locks 901.98 and
remove cover plates 81-92.01 and 81-92.02 with transport locks 901.98 and lock
washers 554.98. Remove casing cover 161 from bearing bracket 330.
For models with a bolted casing cover: Use forcing screws 901.31 to remove
casing cover 161 from bearing bracket 330.
4. Remove gland follower 452 from casing cover 161 and remove the packing.
5. Remove stuffing box ring 454.
6. Remove packing rings 461 and lantern ring 458, if any.
Etanorm FXV
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