The spring tension inside the balancing unit produces the lifting action required to counter balance the loading Arm. As the loading is lowered the spring inside the unit gets released, then
automatically it shifts to its parking position due to the counter action of the spring. It makes sure that the loading arm is fully balanced in horizontal position, under balanced in down ward
position while the loading process is carried out and over balanced in upward position i.e when the system is not in use.