I think I have a newer model. On my 2006 HW256, the access to the worm was from the top. Once you took off the circular cap, you could see the worm nut that was packed with grease.
On my new unit, the manual nut is located on the side. Just like if you have a manual crank. There is no grease at all on the gear not the worm nut. I am definitely gonna put some grease on it. I will check out the manual on the smoke.
It has a strange set up as the worm nut seems to be held on with a washer clamp thingy. Not very durable looking at all. Would hate to sheer that off.