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Did you check drive shaft end play? Severe wear of the drive shaft sleeve, spacers, shims, and two drive gears can accumulate enough so as to allow the tine drive gear to displace far enough that it will no longer engage the large brass worm gear.
Sounds like the belt is slipping. Have you removed the belt cover and inspected the belt and the tensioner pulley ? If your model is like mine the tension can be adjusted just below the handles by looseneing the nut where the cable goes into the cable sheath and moving the cable cover further away from the handle. That takes up some slack and will make the tensioner pulley tighter on the belt. If the belt is shot tension isn't going to help.
Try "google" with "earthquake 5070 manual" first option should be a PDF copy of a model 5070 manual. Will have diagrams on how to adjust the cables.
It appears that the gear case on your model is not capable of being serviced. The cost is over 300 dollars. There is a shear pin or similar connection in the case where the shaft connects to the pulleys. It has broken off and the shaft has no torque now.
Seems to be a fairly common problem with these units. If the big pulley is turning which I assume it is as the drive wheels work, it is most likely a problem in the gear box. The shift mechanism in these units leave a lot to be desired. You can try to repair it your self or take it to a service center. Labor will be high due to the amount of time required to separate the engine and transmission.
Most of them have a pin to lock the wheel to the axle... Check the center hub of the wheel and see if you can find some kind of hole that a pin would go in to lock axle to the wheel...
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