salmson NFCH series, Installation And Operating Instructions Manual

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ENGLISH
16
oiler to avoid damages during following operations.
• Pump casing can be kept fastened to pipe work.
• Remove motor fastening screws and move the motor so that there is
enough space to remove the back pull ‐ out assembly.
When using a coupling with spacer part, it is not necessary to
move the motor rearward.
• Dismantle coupling guard, half coupling on pump side and pump foot
from bearing housing.
1. Loosen nuts 92.00 and remove washers 55.00.
2. Remove back pull out assembly from casing 10.20 and take casing seal
40.00 apart.
3. Loosen nut 92.20 and remove lock washer 93.10.
4. Remove impeller 23.00 and key 94.01.
5. Remove screws 90.13 from bearing bracket 33.00 and remove casing
cover 16.10 with the sealing housing 44.10. It is not necessary to
dismantle the cover 47.10.
6. Mark the position of stop ring 48.50 on the shaft.
7. Remove mechanical seal 43.30 with care.
8. If needed the housing 44.10 can be removed : loosen screws 91.40
and washers 55.02. Pull out the cover 47.10 from bearing bracket 33.00.
9. Remove key 94.00, loosen screws 90.10 and remove cover 36.00.
10. Slide out shaft 21.00 with the ball bearing 32.10 from bearing
bracket 33.00.
11. Remove circlip 93.20, ball bearing 32.10 and spacing ring 52.50 from
the shaft 21.00.
9.3.2 RE ‐ ASSEMBLY
Refer to tightening torques table for screws and bolts.
Never use grease : EPDM seals inside !
All pumps parts should be cleaned before assembly. Silicon based
lubricant or glycol, glycerin or water with soap can be used to ease
assembly of gaskets. Don’t add lubricant on flat gaskets.
1. Slide ball bearing onto the shaft.
2. Assemble bearing bracket and place cover 47.10 with the vent screw
90.30 as shown. Then fasten bearing bracket 33.00.
.
Positioning the mechanical seal on the shaft :
Size a
Shaft dia.25 175,5
Shaft dia. 35 237
3. Place the gasket 40.00.
4. Assemble back pull out assembly into the casing.
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 Tightening torques
M6 8,5 Nm
M8 12 Nm
M10 25 Nm
M12 40 Nm
M16 90 Nm
M20 175 Nm
M24 300 Nm
M30 500 Nm
M36 700 Nm
Stainless steel bolts : apply anti ‐ fretting paste before assembly.
Tightening torque for back cover fastening nuts 92.00 :
Thread Tightening torque
M12 65 Nm
M16 130 Nm