English to Russian Tech/Engineering Agriculture

Here is the context:

In case of maximum bending (particularly with break poles), the drive shaft should not reach the suspension point. Pay attention to sufficient sliding profile cover. с.-х.

This is from a manual of a portable powder sprayer mounted onto a tractor.

Перевод на русский:
В случае максимального прогиба (в особенности ???), карданный вал не должен достигать точки подвески.

What is meant by "break poles" in this phrase?

Appreciate all the feedback!