Maintenance
61
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10.4 Tightening Torques (Countersunk Screws)
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The tightening torque MA is stated in Nm
(unless otherwise indicated).
A = Thread size
(The stability class can be seen on the head of the
screw.)
Ø
5.6 8.8 10.9 12.9
MA (Nm)
M 4
2.5 3.5 4.1
M 5
4.7 7 8
M 6
8 12 15
M 8
20 29 35
M 10
23 39 58 67
M 12
34 68 100 116
M 14
108 160 188
M 16
168 248 292
M 20
340 488 568
A
BM 400 0234
NOTE
The table above applies only to countersunk screws with hexagonal socket heads and metric
threading that are tightened by the hexagonal socket head.
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10.4.1 Deviating Torque
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Screws / nuts MA [Nm]
Nut for cutting disc flange 850
Nut for shear protection (rotary hub) 300
Bearing housing for cutting disc 50
Bearing housing for blade drum 50
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Note
Regularly check that nuts and bolts are tightly in place (approx. every 50 hours) and tighten
them if necessary.
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