Take the key out of the ignition switch. Pull the spark plug wires from the mower so it cannot start on its own while you adjust the clutch.
Lift the Snapper mower’s lid and locate the PTO clutch near the mower blades. It’s a circular part with three nuts around it.
Slip the feeler gauge through the adjustment window in the side of the clutch.
Tighten the adjustment nuts on all sides of the clutch with a wrench.
Remove the feeler gauge. Reattach the spark plugs and start the ignition. Turn the mower off and watch the blades. If they come to a stop five seconds after you turn off the mower, the clutch is working properly.