ピストンが自重で動くか首振りチェックを行うこと（図2）

ピストンが自重で動くか首振りチェックを行うこと（図2）

Results (English) 1:

Doing a swing check piston or moving under its own weight (Figure 2)

Results (English) 2:

Piston moves by its own weight or neck to check it (Figure 2)

Results (English) 3:

A piston works for self-respect, or performing a way of neck check (figure 2)