Short lever on the left side of the torque tube ahead of the gear shift is the PTO engagement lever.
The Power Director is the "Big Stick" lever on the right side with the push button on the top. Forward is high, center is neutral and back is low. That is a wet clutch that runs in trans/hydraulic fluid. It stops the forward motion of the tractor but not the PTO or the hydraulics. Clutch is adjustable inside by moving shim packs between sections. You can access the clutch through the side plate by the lever. Before you do that check that the stop bolt on the high side is adjusted to let it fully engage. Also make sure the set screw on the lever is holding it tight to the shaft.
The foot clutch is a dry clutch on the flywheel just behind the engine. Pressing it will remove power from the PTO & hydraulic pump as well as the transmission. HTH. Mike