that noise is air !!! you need to get the engine up on full trim as far up as it will go, then open the plug to fill the oil ( up on the right, just out of site on vid).
now you need to get this full up, and its very easy not to completely fill the system.
what I do is lower the front of trailer to get that last bit of angle.
Now when filling the reservoir do it very slow, and dont panic about spilling any as yo u cant fill it with a spill or two ha ha .
once full , trim it up and down about 10 times, wait 3 seconds between up and down or trim motor will get too hot.
Now after about 10 trim ups, check the level again, and so on until its 100% full, it will purge itself of air.
and the putting a touch of grease on the rams dont do much, but not a bad thing.
also have you greased the thru tube from the front of the bracket ? this is a must or corrosion can occur even though there is plastic bushings, they can wear out.
also with the centre trim ram, a spray of we40 or similar up on the top wont do any harm and can help a touch, its another area that from new should have a grease fitting, but omc did not put one on for cheapness.
hope this helps you.
