I HAVE A WD WITH A BELT PULLEY, BUT DO NOT KNOW HOW TO ENGAGE IT. NOTHING I`VE FOUND ON IT SO FAR HAS STARTED IT TURNING.

There was also a rarely seen option for the WD and
WD45 that allow the operator to engage and disengage the pulley from the seat.

I THOUGHT AS MUCH, GUESS I NEED TO PURCHASE A MANUAL. THANK YOU FOR YOUR HELP.

The manual states that the pulley should have about 1/8" in/out play at the pulley rim when the correct hole is used for the locking bolt.

J.R.,
Loosen the bolt in the casting just inside the frame channel above the pulley. Then slide the pulley in and re-tighten the bolt. You can also remove the pulley by pulling out on it, but unless you have the plate to cover the hole, don't run it with it out.
If you remove the pulley and shaft, you'll see there is a series of indentations drilled around the pulley shaft carrier that goes inside the tractor, each slightly further in or out. These are where the bolt noted above seats when tightened. Rotating the shaft to various holes allows you to adjust the gear mesh. Try a hole, then rotate the pulley back and forth by hand to check for play. You want a little, but not excessive play. If you get too much play, you'll probably hear it.
Once the pulley is engaged and the bolt is re-tightened, it will run whenever the foot clutch is released and the engine is running. It's not the world's most convenient setup, but functional.

To engage the pulley....

With engine shut OFF...loosen the set-screw bolt on the side, near the frame, behind the pulley.....Slide the whole unit toward the frame, try to rotate the pulley to see that the gears are meshed.... Tighten the set-screw bolt, and you are done.. The unit is in far enough when the set-screw bolt turns in...tighten it good....