Yuchai YC310LC-8, Operation Manual

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Tightening Torque
The following table provides tightening torque for all kinds of bolts, nuts installed on the machine. If the
bolt or nut is not tightened to the specified torque, the parts tightened or linked by it will be loosen or
even damaged, leading to the machine failure or impacting on the operations.
Tightening torque of the general parts
Bolt
strength
grade
Yield
strength
N/mm
2
Bolt nominal diameter mm
6 8 10 12 14 16 18 20
Tightening torque Nm
8.8 640 9~12 22~30 45~59 78~104 124~165 193~257 264~354 376~502
10.9 900 13~16 30~36 65~78 110~130 180~210 280~330 380~450 540~650
12.9 1080 16~21 38~51 75~100 131~175 209~278 326~434 448~597 635~847
Bolt
strength
grade
Yield
strength
N/mm
2
Bolt nominal diameter mm
22 24 27 30 33 36 39
Tightening torque Nm
8.8 640 512~683 651~868 952~1269 1293~1723 1759~2345 2259~3012 2923~3898
10.9 900 740~880 940~1120 1400~1650 1700~2000 2473~3298 2800~3350 4111~5481
12.9 1080 864~1152 1098~1461 1606~2142 2181~2908 2968~3958 3812~5082 4933~6577
5-8