When my 600lb tiller is mounted on my B2620 and the 3PH is raised, it drops about 1" every 5 minutes. Also, I've noticed when nothing is mounted, the 3PH arms eventually end up down to the ground, but I'm not certain how long this takes. Is this expected? The tractor only has 20 hours. Does it take a while for the seals to break-in and start functioning better.