Torque Values; Service; Change The Oil - Xylem Flygt 2008 Ready 8 Installation, Operation And Maintenance Manual

6.1 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, then contact a sales or authorized
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.

6.2 Service

Regular service of the pump ensures more reliable operation.
Inspection
The pump should be inspected at least twice a year, more frequently under severe
operating conditions.
Screw tightening
During assembly or service of the pumps we recommend that the screws be tightened to
approximately 6–8 Nm (4.5–6 ft-lbs). The tightening torque ensures that the parts are
correctly fastened and that the pumps will operate as intended.
NOTICE:
Make sure that the oil-plug and securing screws for the strainer or the pump housing are
not tightened too hard.
To maintain screw tightness, use some mineral oil on all non-stainless steel screws.
When using stainless steel screws on stainless steel parts, apply Aral Degol GS 460 or
National Chemseal Thread-Eze lubricant in order to prevent the screws from seizing.

6.3 Change the oil

A paraffin oil with viscosity close to ISO VG32 is recommended. The pump is delivered
from the factory with this type of oil. Examples of suitable oil types are the following:
2008 Ready 8, 8S Installation, Operation, and Maintenance
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)
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)
6 Maintenance
M24 M30
629 (464) 1240 (915)
— —
M24 M30
665 (490) 1310
(966.2)
935 (689) 1840
(1357)
1120 2210
(825.1) (1630)
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