The tension limiter prevents pulling the calf with too much force. Without regulation, tensile forces of up to 600 kg can be achieved, representing a substantial risk of injury to the cow and calf. For normal births, forces of up to 160 kg are entirely sufficient.
The HK Rheintechnik Mechanism 2060 is fitted with a freely adjustable tension control. The lever locks when the pre-set force is attained. The tension control can also be released in an emergency.