The reason is that fork can't absorb the transmission error, guiding-rail has poor straightness, and lifting rack is loose. The right way is to modify tractor, adjust the straightness of guiding-rail, and tighten the screw mounts.
クレーン専門家にお問い合わせください
メッセージをお送りください。できるだけ早くご連絡いたします。