The study shows that it is necessary to know running quality (that is load-deflection curve) in order to estimate load degree on machines power lines. Running qualities are limited on the maximal loads (durability). It should be also known the impact parameter points (energy or deformation). Their superposition on the running quality allows determining generated loads degree in machine power line. It is possible to decrease the generated loads to the safest level by changing power line running quality with the help of dynamic spare parts. The type of machine security system depends on drive line data quality K: using shock-absorber preventer, arresting device preventer or a combination of the both.

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