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
class
M4 M5 M6 M8 M10 M12 M16 M20 M24 M30
50 1.0 (0.74) 2.0 (1.5) 3.0 (2.2) 8.0 (5.9) 15 (11) 27 (20) 65 (48) 127 (93.7) 220 (162) 434 (320)
70, 80 2.7 (2) 5.4 (4) 9.0 (6.6) 22 (16) 44 (32) 76 (56) 187 (138) 364 (268) 629 (464) 1240 (915)
100 4.1 (3) 8.1 (6) 14 (10) 34 (25) 66 (49) 115 (84.8) 248 (183) 481 (355) — —
Table 2: Steel, torque Nm (ft-lbs)
Property
class
M4 M5 M6 M8 M10 M12 M16 M20 M24 M30
8.8 2.9 (2.1) 5.7 (4.2) 9.8 (7.2) 24 (18) 47 (35) 81(60) 194 (143) 385 (285) 665 (490) 1310
(966.2)
10.9 4.0 (2.9) 8.1 (6) 14 (10) 33 (24) 65 (48) 114 (84) 277 (204) 541 (399) 935 (689) 1840
(1357)
12.9 4.9 (3.6) 9.7 (7.2) 17 (13) 40 (30) 79 (58) 136 (100) 333 (245) 649 (480) 1120
(825.1)
2210
(1630)
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:
6 Maintenance
2008 Ready 8, 8S Installation, Operation, and Maintenance 21
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