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just got mine (also dealer assembled) not working great. Can you tell me what you adjusted / found that made a difference?
Hey there. There were a few things I did that improved the experience with it.
First, there are four connecting rods, upper and lower on either side. These rods are adjustable to be able to close the door and also make it seal better. Mine was initially just adjusted so I could close the door but that was it. There's nothing in the owner's manual that tells you anything about them so it's a bit of trial and error.
Also, the hinge for the door wasn't adjusted properly. There is a bit of play in the mounting holes in the upper half of the hinge. I tweaked it to make it more centered.
There are two mounting bolts with big steel bushings. This is where the bagger actually rests. They kept coming loose. So I applied thread locker to the threads and basically all the threads everywhere on the thing to prevent things from getting loose again. Even the knob on the handle was getting loose.
When the dealer installed it, they installed it so that the black elastic strap that connected the tube to the deck discharge so that the strap was facing out. I remounted it so that the strap is on the top. This helps to prevent the end from constantly sagging. Finally, I noticed that the tube wasn't slid in all the way that it could be on the upper connection. There was a significant arc in the tube before I found this. Sliding the tube up as far as it would go took reduced the arc.
Even with the connecting arms as dialed in as I can get them when closing the door I really have to "send it home" when closing the door. In other words, takes a good amount of rapid force so that the catches on the door take hold.
One other thing I haven't found a good way to correct. I still have to wrap a bungee strap in front of the handle to keep it closed. Otherwise, when I hit a good bump it will jar the door open. There doesn't appear to be enough pressure in the clamp thing that is supposed to hold the handle in place. I do have a very bumpy/rough property so maybe that's part of it. I'd like to figure out how to design a latch to hold the handle in place. But I haven't gotten that far.
Overall with all the adjustments I made the bagger works better. There are some fundamental design issues in my opinion. But I'm not in the bagger manufacturing business so I'm really just armchair quarterbacking. I just believe that for the money that thing costs I was expecting more.
I hope this helps. If you find anything that improves your experience I'd love to know so I can apply it also.