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8.2.4
Checking tightness of fastening bolts
Note
Replace damaged headless screws with new screws of the same type and strength class.
Switch off the power to the drive unit and use a torque wrench to check the seating of all
fastening bolts.
The general tolerance for the tightening torque in Nm is 10 %. The friction coefficient is
0.14 μ.
Table 8- 3
Thread size
M4
M5
M6
M8
M10
M12
M16
M20
M24
M30
M36
8.2.5
Inspection of the motor
Carry out a scheduled inspection of the geared motor once a year in accordance with the
possible criteria listed in Section Faults, causes and remedies (Page 49).
Check the geared motor in accordance with the criteria set out in Section General
information and safety notes (Page 7).
Touch up damaged paintwork carefully.
BA 2320
Operating Instructions, 02/2015, 70000004023775
Tightening torques for fastening bolts
Tightening torque at strength class
8.8
[Nm]
3
6
10
25
50
90
210
450
750
1 500
2 500
Service and maintenance
8.2 Description of maintenance and repair work
10.9
[Nm]
4
9
15
35
70
120
295
580
1 000
2 000
3 600
12.9
[Nm]
5
10
18
41
85
145
355
690
1 200
2 400
4 200
55
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