I know this is an old thread, but I wanted to update the link to the manufacturer of Parker sweepers:
Parker Lawn Care Products
I'm picking up a lightly used Parker Suburbanite SU8336 model (which seems to be a discontinued product). It's a recent model, judging from the red color and overall condition of everything. $180 for a unit that commonly sold for $900 or more. I've heard of people getting them used for less, but probably not in the condition of this one. Looking forward to giving it a spin this weekend!
Anyway, I used the above web site to download the owner's manual, which the seller couldn't provide.