They put a small gasoline engine that powers a hydraulic pump, and use that to raise and lower the equipment.
Used to be a bunch near here but they moved to Missouri and they would not use the gasoline engine on that rig. Diesel was OK, because no Electric being used. They moved to where there were more of them. Said lack of marriage partners was making them lose their young to other ways. miles
The engines I've seen are Briggs&Stratton gas burners, but they also use bigger motors, including old tractor engines, on other equipment. One of Mennonite neighbors has a bush hog powered by a small Allis Chalmers engine.
The ones here don't worry about marriage partners, they just marry their first cousins. I guess the closer the kin, the better it goes in.