Grundfos LS 100-80-241, Service Instructions Manual

Page: 15 / 48

English (GB)
15
Fitting the bearings and shaft seals
1. Clean the seal head surface using clean paper. Install the seal
head on the shaft, rely onto the seal retainer ring (105b). Start
at the non-drive end.
2. Fit the O-ring (109, 109a).
3. Fit the seal housing (124).
4. Fit the seal housing screws (114). Tighten to the correct
torque. See section
2.3.1 Tightening torques
.
5. Press the stationary shaft seal part (105) home in the seal
cover (58).
6. Fit the gasket (110a) or O-ring (110).
7. Fit and cross-tighten the screws (58a) to the correct torque.
See section
2.3.1 Tightening torques
.
8. Fit the slinger (79).
9. Press the lip seal (113f) home in the bearing housing (113).
10. Fit the bearing housing (113) and the screws (114b).
Cross-tighten to the correct torque. See section
2.3.1 Tightening torques
.
11. Fit the spacer ring (54c) (not pump type LS 350-250-498 and
LS 350-250-630).
12. Lubricate the bearing (54), and press it home in the bearing
housing (113). For lubricant, see section
Ball bearing grease
.
13. Fit the spacer ring (54c) (not pump type LS 350-250-498 and
LS 350-250-630).
14. Fit the gasket (113e), bearing cover (113d) and screws (114a).
Cross-tighten to the correct torque. See section
2.3.1 Tightening torques
.
15. Make sure to polish off any burrs on the shaft drive end.
16. Repeat steps 1 to 10 for the drive end.
17. Lubricate the bearing (53), and press it home in the bearing
housing (113). For lubricant, see section
Ball bearing grease
.
18. Fit the gasket (113e), bearing cover (113d) and screws (114a).
Cross-tighten to the correct torque. See section
2.3.1 Tightening torques
.
19. Check that the shaft can rotate freely.
20. Fit the key (11a).
4.6 Replacing ring in the stuffing box, LS with sleeve
4.6.1 Dismantling
1. Remove the four screws (114a) holding the bearing cover
(113d).
2. Remove the bearing cover (113d) and gasket (113e).
3. Loosen the set screw in the bearing snap ring (54).
4. Loosen the bearing snap ring (54) by moving it against the
direction of rotation.
5. Remove any marks from the set screws on the shaft non-drive
end (51).
6. Loosen the nuts on the stuffing box gland.
7. Remove the screws (114).
8. Pull the seal housing (124) off the shaft (51) using a puller,
and then remove the gasket (109b) or O-ring (109, 109a).
9. Remove the slinger (79).
10. Pull the bearing (54) out of the seal housing (124).
11. Remove the nuts and the stuffing box gland.
12. If necessary, use a packing ring extractor to pull out one or
more worn packing rings.
13. Remove the washer.
14. Remove the snap ring.
4.6.2 Assembly
1. Measure the length of the used packing ring, and cut off a new
one of the same length.
2. Cut the ends of the packing ring off at an angle of 45 °.
3. Fit the stuffing box gland, and tighten the nuts, but leave
loose.
4. Fit the packing rings. The joinings between the packing ring
ends are displaced 180 °.
5. Fit the washer and snap ring.
6. Press a punch down the middle of the packing rings so that
they are pushed all the way to the edge.
7. Fit the gasket (109b) or O-ring (109, 109a).
8. Fit the seal housing (124) and the slinger (79). Note that the
slinger must be placed between the stationary shaft seal part
and the bearing.
9. Fit the screws (114). Cross-tighten to the correct torque. See
section
2.3.1 Tightening torques
.
10. Check that the shaft can rotate freely.
11. Lubricate the bearing (54), and press it home in the seal
housing (124). For lubricant, see section
Ball bearing grease
.
12. Fit the bearing snap ring (54) by moving it with the direction of
rotation. Then tighten the two set screws.
13. Fit the gasket (113e), bearing cover (113d) and screws (114a).
Cross-tighten to the correct torque. See section
2.3.1 Tightening torques
.
14. Tighten the nuts of the stuffing box gland.
Fig. 7
Sectional drawing of the stuffing box
TM
04 184
9 1
1
08