So, every year I sift dirt for wax dirt, as well as several bales of peat moss. Right now, I'm using a large wood frame sifter I put together, but still have to manually shake it to sift everything, so it still takes quite a while. I searched online for an electric sifter of some sort, and found a couple electric drum style sifters, but mostly sold in the UK, couldn't really find anything in the US. Any of you guys have/build/come up with an easier or more efficient way for sifting dirt and pet moss pre season?

I made a pipe roller system on a wooden frame. Basically, a larger black pipe slid over a smaller pipe. I have the ends of the small black pipe threaded so I can use female fittings to mount on my board face. I have 3 rows of roller pipe spread apart to allow my sifter screen to ride upon it easily without falling off.

I lay down a large tarp under my roller system which I mount a pair of sawhorses. I place my large 4' x 4' screen framed sifter on the roller system and shake it back and forth briskly. I shovel large scoops of raw peat on to the screen. I can do 2 -3 large cubic ft bales in a short time frame.

I dump the coarse bark and sticks to the side that is left over after the sifting cycle is complete. Just takes about a min of shaking to run all the shoveled peat that can be loaded into the sifter.

Archeological sifter

I bolted an old reciprocating saw blade to my big sifter on some saw horses. I never mounted the saw so it worked okay but I wasn’t doing much and just wanted to see how well it might work.
If you could figure out a way to hold the saw you could put a zip tie on the trigger to your desired speed to shake the sifter.

To make a vibratory attachment you only need to rotate a shaft with an unbalanced weight attached to it. Think of a crankshaft.

Find a kid, if he'll help you do that by hand, you'll have a partner for life!