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4.3.12 Removing the shaft seal cartridge
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Loosen and remove the shaft seal protection tool (C).
2. Remove the shaft seal spring (105a).
3. Withdraw the shaft seal cartridge (105) from the shaft using a
puller.
4.3.13 Removing the upper seal housing (only SL)
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Remove the screws (182b) including O-rings (182d) and
washers (182c).
2. Remove the upper seal housing (58). Use a soft hammer very
gently.
3. Remove the O-ring (72a).
4.3.14 Removing the upper seal housing cover (only SE)
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Remove the screw (182b) including O-rings (182d) and
washers (182c).
2. Remove the O-ring (72a).
3. Gently remove the upper seal housing (58a). Use crowbars
and a soft hammer.
4.3.15 Removing the shaft with rotor
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Remove the circlip (55a) using the locking-ring pliers (A).
2. Insert an eyebolt into the shaft end.
3. Lift the rotor and lower bearing housing slightly away from the
stator housing (55) using the hoist.
4. Disconnect the plugs from the moisture switch and lower the
bearing sensor, if fitted.
5. Lift the rotor away.
4.3.16 Removing the bearings
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Place the rotor in a vice with soft jaws.
2. Remove the screw and washer of the leakage switch (521).
3. Remove the leakage switch (521).
4. Remove the circlip (187) and the washer (187a).
5. Remove the three screws (182) and the bearing bracket cover
(59).
6. Remove the cable if the leakage switch (521) is fitted.
7. Pull off the lower bearing bracket (155) and the ball bearing
(153) with a puller.
8. Knock out the bearing (153) of the lower bearing bracket (155)
using a hammer and punch.
9. Remove the upper ball bearing (154) with a puller.
10. Remove the O-ring (72).
4.4 Assembling the pump
Position numbers of parts (numbers in brackets) refer
to section
7.8 Exploded
Position numbers of tools (letters in brackets) refer to
section
7.3 Special
4.4.1 Fitting the bearings
Except for replacement or dismantling of pump
housing, shaft seal, impeller, seal ring and wear ring,
FM
all other service work must be carried out by
Grundfos or a FM-approved service centre.
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Heat the new upper bearing (154) to 248 °F (120 °C), and fit it
on the rotor (172).
2. Place the new lower bearing (153) in the lower bearing
bracket (155), and press it home by pressing on the outer
bearing ring.
3. Place the lower bearing bracket with the new lower bearing on
the rotor, and press the bearing home by pressing on the inner
bearing ring.
4.4.2 Fitting the leakage switch (if fitted)
Maintenance and service work on explosion-proof
FM
products must be carried out by Grundfos or a
service workshop authorized by Grundfos.
1. Pull the cable of the leakage switch through the hole in the
lower bearing bracket (155).
2. Fit the leakage switch (521) by means of its screws and
washers.
3. Place the bearing bracket cover (59) and fit the screws (182)
and tighten to 29.5 lbf-ft ± 1.5 (40 Nm ± 2).
4. Fit the washer (187a) and circlip (187) using locking-ring
pliers.
5. Check that the bearings can rotate freely.
drawings.
tools.
11
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