Craftsman 6.0 lawnmower frontwheel drive won't engage .

Cathy, there is a way to adjust belt tension on some models whether it is by the cable or a slotted bracket where the idler wheel is mounted, depends on make and model. If you have your manual check in it for belt adjustment. Could be stretched belt, stretched cable, worn/oil on pulley, seized tensioner, stretched/broken spring on tensioner,etc.
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The PTO cable will come out the chassis straight down from the engagement lever on the right side of the dash panel. Will be fastened to the frame on the right side in front of the rear wheel with a zip tie. Loop over the brake rod and attach to the deck on a tab at the rear center of the deck. A hair pin will secure it there. The inner cable continues from there under the belt and the spring hooks into the engagement bracket. There may be two hole for the spring to hook into. They are marked 38 or 42.

If its a riding mower it probably the drive belts off track or slung off. The mower will still start up and turn blades with the drive belt off, but want engage to go forward or reverse if this is the problem.

Is it automatic with the peddle? If it is the spring installs from underneath.

Must be a bad mower that got thru the assembly line somehow. I have owned a front wheel drive Craftsman mower for 7 yrs and have never had one single problem with anything on it.

Unless you want to replace these gears You can make this mower into a push mower by taking the wheels off and disconnecting the gear drives. One time I took wheels off the front and put on the rear and rear off the back and put on front. In order for this to work all four wheels have to be the same size.

have you checked the front hubs are engaged or engaging

front wheel drive(FWD)

On your model I beleive these wheels are driven with small gears inside the inside diameter of the wheels. If the shaft is turning, then you probably have a gear problem. Remove a wheel and inspect both the wheel, and the small gear. They are prone to wear.I'd suggest replacing all four parts if worn.

sound like electric clutch not working