12.2.18 Checking the tightness of fastening bolts
Note
Replace damaged headless bolts with new bolts of the same type and strength class.
Switch o the power supply to the drive unit. Check all fastening bolts for tightness using a
torque wrench.
The general tolerance for the tightening torque in Nm is 10 %. The friction coecient is 0.14 μ.
Table 12-19 Tightening torques for fastening bolts
Thread size Tightening torque for strength class
8.8 10.9 12.9
Nm Nm Nm
M4 3 4 5
M5 6 9 10
M6 10 15 18
M8 25 35 41
M10 50 70 85
M12 90 120 145
M16 210 295 355
M20 450 580 690
M24 750 1000 1200
M30 1500 2000 2400
M36 2500 3600 4200
12.2.19 Inspection of the motor
Check the motor in accordance with the criteria set out in General motor information (Page 447).
Touch up damaged paintwork carefully.
12.2.20 Servicing the brake
12.2.20.1 Wear of the spring-operated brake
The friction lining and the mechanical components of the brake are subject to wear due to their
inherent function. For safe and fault-free operation, the brake must be regularly checked and
adjusted, and if necessary, replaced.
The following table describes the dierent causes of wear and their eects on the spring-
operated brake components. The important inuencing factors have to be quantied in
order to calculate the service life of the rotor and the brake and determine the stipulated
Additional information on the SIMOGEAR geared motor
12.2Specic data motor
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 467
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