Koza

Hi, I work on a H model and I have a question about the Cargo ramp. It has a weird tendency to "free fall" whether there's 0 psi or 3,000 psi on the auxiliary system. When the grasshopper arms are disconnected it eventually falls to the ground in less than 15 minutes(from air drop position). This happens regardless of the sequencer being in 3N or 6N, and with only 2 people(average 200lbs each) on the ramp with no other weight. It's a Sterer type manifold and by our books its allowed to free fall when hand pumping it up or down. However, at the rate that it drops to the ground it seems like there's something else wrong, but I dont know what. Anyone have any ideas?