Dl757md From United States of America, joined May 2004, 1560 posts, RR: 18 Reply 5, posted (8 years 3 months 2 days 18 hours ago) and read 3120 times:
I concur with the explanations above. The truck tilt actuator has 3000psi hydraulic fluid acting on it and it pretty severly rams the truck to it's tilt position against the stops. When the truck hits those stops that hard it's going to make a pretty loud thump. No problems though as they where designed for this.