Pull the belt off the PTO. The PTO pulley should rotate freely. Actuate the PTO clutch (ignition on, engine NOT running) and the PTO pulley should turn over the engine, i.e., be engaged.
The PTO switch serves two purposes--one is an interlock so the engine won't start (turn over/crank) if the PTO switch is in the ON or engaged position. The second purpose, of course, is to actuate the PTO clutch. There should also be a fuse in the dash panel opposite the starting key that protects the circuit that actuates the PTO clutch. Check that.
Go to the technical documents section of the site and download the service manual. It tells how to adjust the PTO clutch. You'll need a feeler gauge set. You'll also find the wiring diagram for the switch.
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