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During the reassembly, always make sure that existing index markings are in line.
The reassembled drive unit must always be insulation-tested and the reassembled pump
must always be test-run before normal operation.
Torque values
All screws and nuts must be lubricated to achieve correct tightening torque. Screws that
are screwed into stainless steel must have the threads coated with suitable lubricants to
prevent seizing.
If there is a question regarding the tightening torques, please contact the local sales and
service representative.
Screws and nuts
Table 1: Stainless steel, A2 and A4, torque Nm (ft-lbs)
Property
M4
M5
class
50
1.0 (0.74)
2.0 (1.5)
70, 80
2.7 (2)
5.4 (4)
100
4.1 (3)
8.1 (6)
Table 2: Steel, torque Nm (ft-lbs)
Property
M4
M5
class
8.8
2.9 (2.1)
5.7 (4.2)
10.9
4.0 (2.9)
8.1 (6)
12.9
4.9 (3.6)
9.7 (7.2)
Hexagon screws with countersunk heads
For hexagon socket head screws with countersunk head, maximum torque for all property
classes must be 80% of the values for property class 8.8 above.
Service
Regular inspection and service of the pump ensures more reliable operation.
Type of service Purpose
Inspection
Major
overhaul
Flygt 2830.180 Installation, Operation, and Maintenance Manual
M6
M8
M10
3.0 (2.2)
8.0 (5.9)
15 (11)
9.0 (6.6)
22 (16)
44 (32)
14 (10)
34 (25)
66 (49)
M6
M8
M10
9.8 (7.2)
24 (18)
47 (35)
14 (10)
33 (24)
65 (48)
17 (13)
40 (30)
79 (58)
To prevent operational interruptions and machine
breakdown. Measures to secure performance and pump
efficiency are defined and decided for each individual
application. It can include such things as impeller
trimming, wear part control and replacement, control of
zinc-anodes and control of the stator.
To secure a long operating lifetime for the product. It
includes replacement of key components and the
measures taken during an inspection.
M12
M16
M20
27 (20)
65 (48)
127 (93.7) 220 (162) 434 (320)
76 (56)
187 (138)
364 (268)
115 (84.8) 248 (183)
481 (355)
M12
M16
M20
81(60)
194 (143)
385 (285)
114 (84)
277 (204)
541 (399)
136 (100) 333 (245)
649 (480)
Inspection interval
2,000 hours or 1 year, whichever comes
first. Applies to normal applications and
operating conditions at media (liquid)
temperatures < 40°C (104°F).
4,000 hours or 2 years, whichever comes
first. These intervals apply to normal
applications and operating conditions at
media (liquid) temperatures < 40°C
(104°F).
Maintenance
M24
M30
629 (464) 1240 (915)
—
—
M24
M30
665 (490) 1310
(966.2)
935 (689) 1840
(1357)
1120
2210
(825.1)
(1630)
23
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