Grundfos MS6000, Инструкция по эксплуатации, Страница: 8 / 25

English (GB)
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6. Dismantling of MS6000
1. Place the motor vertical in a set of jaws, pos. L.
Note: Make sure that the motor is secure in the jaws, and
cannot move.
2. Before dismantling the motor, disconnect the motor cable, by
slacking and removing the two screws, pos. 221 and the
screw, pos. 50, which is holding the earth clamp.
3. Use two screwdrivers to manoeuvre the plug out of its socket,
and pull out the plug.
4. Remove the sand shield, pos. 27, from the shaft.
5. Slacken and remove the remaining three screws, pos. 50,
holding the shaft seal housing, pos. 32.
6. Use two screwdrivers to tip out the shaft seal housing, pos.
32, see fig. 3.
Fig. 3 Removal of shaft seal housing
7. Use to screwdrivers to remove the rotating part of the shaft
seal, pos. 34.
8. Remove the washer, pos. 28, from the shaft.
9. Pull up the D-end bearing retainer, pos. 5, using a small
screwdriver.
10. Tilt the motor and drain the motor liquid into a bucket.
11. Turn the motor to vertical position with the ND-end facing
upwards and remove the four screws, pos. 46, from the
bottom cover, pos. 13.
12. Remove the bottom cover including the diaphragm, pos. 12.
13. Slacken and remove the four screws, pos. 48, together with
the clamping flange, pos. 7.
14. Press down the shaft adjusting unit, pos. 45, against the thrust
bearing to relieve the stress on the retainer spring, pos. 49.
15. Use a small screwdriver to push the retainer spring out of the
recess in the stator housing, pos. 1, and pull out the adjusting
shaft unit.
16. Remove the stationary part of the of the thrust bearing, pos. 3,
by tilting it out its brackets, pos. 42.
Note: To remove the 40 kN thrust bearing it may be necessary
to use two screwdrivers to force the thrust bearing out of its
brackets.
17. Pull of the rotations part of the thrust bearing, pos. 6.
The approach for this depends of the size of the thrust
bearing, whether its a 7.5, 27 or 40 kN thrust bearing.
– 7.5 kN or 27 kN thrust bearing
– Turn the motor to horizontal position.
– Slacken and remove the screws, pos. 41, together with the
stop for bearing bracket(s), pos. 42.
– Carefully pull out the rotor, pos. 2, from the stator housing,
and fix it in a vice.
– Pull of the rotating part of the thrust bearing by using a
puller, pos. O, together with a plug, pos. P.
– Remove the clamping flange, pos. 7a, and radial bearing,
pos. 4, from the rotor.
– 40 kN thrust bearing
– Turn the motor to horizontal position.
– Mount the puller, pos. Q, into the rotation part of the thrust
bearing, and fasten it with two screws.
– Use a hexagon tee key to fasten the two screws in the puller,
until the thrust bearing looses the grip from the conus on the
shaft.
– Remove the puller and the thrust bearing.
– Slacken and remove the screws, pos. 41, together with the
stop for bearing brackets, pos. 42.
– Carefully pull out the rotor, pos. 2, from the stator housing,
and fix it in a vice.
– Remove the clamping flange, pos. 7a, and the radial
bearing, pos. 4, from inside the stator housing.
18. Remove the upthrust ring, pos. 2a, positioned in the D-end of
the stator housing. Use a long wooden stick to push out
upthrust ring.
Note: The upthrust ring can only be removed by
pushing it towards the ND-end.
6.1 Checking of parts
Before assembling the motor, clean and check all parts for
damage and wear. All rubber parts must be soft, flexible and
intact.
The following part should be checked:
Shaft seal
The sliding surface must be intact and smooth
Lower and upper radial bearing
The bearings must be intact, smooth and without visible wear.
Shaft with rotor
The tungsten carbide rings on the shaft must be intact, and the
sliding surface must be intact, smooth and without visible wear,
Thrust bearing
The thrust bearing must be intact and the sliding surface must be
intact and smooth.
Upthrust ring
The ring must be intact and smooth.
Motor liquid
The motor liquid shall be clean and clear motor when shaft seal
housing is removed.
Black motor liquid, then your thrust bearing is damaged
Diaphragm
The diaphragm should be intact with no cracks.
6.2 Replacement of wear parts
Always replace with wear kits. See the recommended kits and
spare parts in the Grundfos Service Kit Catalogue.
TM0
5
9
770
4
413