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2. Remove nuts 92.00 and slide out the back pull out unit from the
casing 10.20. Use jack screw 90.80 to ease disassembly. Remove gasket
40.00.
3. Loosen impeller nut 92.20 and helicoil 93.00.
4. Slide out impeller 23.00 and its flat gaskets 40.02 and 40.01.
5. Loosen screws 91.42 and remove wear ring 54.20 from casing cover
16.10.
6. Remove key 94.01 and slide out shaft sleeve 52.30 with mechanical
seal 43.30 from shaft 21.10. Remove key 94.02.
Mark position of mechanical seal before dismantling.
7. Remove nuts 92.01 and casing cover 16.10.
8. Remove nuts 90.23, take away cover 47.10 and mechanical seal
housing 48.70. Change gasket 40.05 for a new one.
9. Remove screws 91.44 and cover 36.00 on motor side with its gasket
40.03.
10. Slide out thrower 50.70 from the shaft.
11. Withdraw shaft 21.10 with ball bearings 32.11 and 32.20 with care
from bearing bracket housing 33.00.
12. Remove screws 91.43 and cover 36.01 with its gasket 40.04.
13. Remove circlip 93.01, loosen shaft nut 92.10 and remove lock
washer 93.01. Extract ball bearing 32.11 and 32.20 from the shaft.
14. Loosen screw 90.11, remove washer 93.02, and foot 18.30.
15. Dismantle if required (worn or damaged part) the lip seals 42.30 and
42.31 from covers 36.00 and 36.01.
9.3.2
RE‐ASSEMBLY
Refer to tightening torques table for screws and bolts.
Before starting assembly of the pump see sectional drawings of
the pump.
Respect screws and bolts tightening torques.
1. Install ball bearings 32.11 and 32.20, the circlips 93.01 onto the shaft
21.10. Screw nut 92.01. When installing new ball bearing on the shaft,
heat them up to 80°C to ease assembly.
2. Press lip seals in bearing covers 36.00 and 36.01. Use news seals if
necessary.
3. Install bearing cover 36.01 on pump side with its flat gasket 40.04 and
screws 91.43.
4. Fasten foot 18.30 using washer 93.02 and screw 90.11. Slide shaft
assembly inside the ball bearing housing 33.00.
5. Install ball bearing cover with the flat gasket 40.03 and the thrower
50.70.
6. Install cover 47.10 and mechanical seal stationary seat 48.70, the new
gasket 40.05 in the casing cover 16.10 and fasten it with screws 90.23.
7. Assemble casing cover 16.10 and bearing bracket assembly with
screws 90.21.
8. Press the key 94.02 into the shaft and install mechanical seal rotating
part 43.30 onto shaft sleeve. Press the key 94.01 in the shaft 21.10.
Make sure that seals and friction faces are not damaged during
assembly (scrubs on the sleeve, dirt, ...).
It is recommended to add light oil on the shaft to ease assembly.
9. Install wear ring 54.20 and screws 91.42.
10. Install impeller 23.00.
11. Install the complete back‐pull‐out assembly into the casing with the
casing seal 40.00 between.
9.3.3
MOTOR
In order to ensure an optimum lifetime of the integrated motor a
minimum maintenance is necessary : clean cooling fins regularly, check
coupling alignment (if any), check cable gland tightening, ...
Ball bearing lifetime depends on axial and radial forces applied on motor
shaft therefore on the pump design (close‐coupled pump, pump sets
with elastic coupling, ...).
Motor can be fitted with lifetime lubricated ball bearings (identified ZZ
or 2Z) or greased. Greasing nipples are located at the ball bearings and
re‐greasing quantities are indicated on motor nameplate.
See motor instructions manual to find data about maintenance work to
be performed.
9.4 TIGHTENING TORQUES
Tightening torques depend on the material used in the assembly and on
the type of lubricant that is used.
Refer to applicable regulation to know the tightening torques for
the fastening of cast iron or stainless steel made flanges. The
values given below should be only indicative. If real tightening torques
are required please ask our technical services.
Threads
M6
M8
M10
M12
M16
M20
M24
M30
M36
Stainless steel bolts : apply anti‐fretting paste before assembly.
Tightening torque for impeller nut item 92.20 :
Bearing bracket size
55
65
75
9.5 TOOLS REQUIRED
A typical range of tools that are required for pump maintenance is
listed below. Those tools are standard one and should be available
in every industrial maintenance Dpt.
• Wrenches to suit up to M48 nuts,
• Socket spanner up to M 48,
• Allen keys up to 10 mm,
• Range of screwdrivers,
• Soft mallet.
If maintenance work must be performed in an ATEX classified area
then make sure that use of all necessary tools are authorized in the
area.
More specialized equipment :
• Bearing pullers,
• Bearing induction heater for ball bearing assembly,
• Coupling grip spanner.
Additional equipments used for coupling alignment :
• Calipers,
• Crowbar,
• Straightedge,
• Shims,
• Sledgehammer.
16
Tightening torques
8,5 Nm
12 Nm
25 Nm
40 Nm
90 Nm
175 Nm
300 Nm
500 Nm
700 Nm
Tightening torque
405 Nm
490 Nm
580 Nm
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