Hey oldballs,
You give good advice - for running a slow RPM front-tine tiller. There is not drag stake on a rear tine tiller unless you make one as oldmech explains.
The tiller Tom is using has a tine speed of 290 RPM. The ratio of drive wheel revolutions to tine revolutions is 20 to 1 in 1st gear. On a rear tine tiller, the purpose of the drive wheels is not to propel the tractor forward, but to HOLD BACK the tiller. If Tom leans down on the handles, his tines will take over for the drive wheels and it will be like he lit a rocket on the tail of the tractor. If he wants to get more "dig" from a rear tine tiller, he needs to add weight, not down pressure.
Tom,
Aczlan has it right. Tilling in ultra-dry conditions is difficult because the ground becomes concrete. It's hard on the operator, hard on the soil, and hard on the machinery. This is true with ANY soil and any machinery. If my farm ground is too dry, I can't get my 5-16 plow I pull behind my 125 hp JD 4430 to penetrate the soil. You are right that too-wet conditions are also brutal on soil structure and I wouldn't recommend tilling then, either. A good rule of thumb on when the ground is fit is to take a handful of it and make a ball. Toss the ball from hand to hand. If the ball stays intact, your ground is too wet. If the ball breaks apart in the first couple throws, it's ready to go. If you can't dig the ball out of the ground by hand, it's too dry.