Briggs & Stratton 42568x50A Parts Manual

Ensure the parking brake is engaged, the PTO is disengaged, and the throttle is set to choke. Turn the ignition key to the start position until the engine starts.
Warm up the engine, turn it off, and remove the oil drain plug. Let the oil drain completely, then replace the plug and add new oil as per the specifications in the manual.
Check the fuel level, battery charge, and ensure the spark plug is in good condition. Also, verify that the safety switches are engaged.
Check for dull or damaged blades, ensure the tire pressure is even, and adjust the deck leveling according to the manual instructions.
Clean the tractor, change the oil, stabilize the fuel, remove the battery, and store it in a dry location. Cover the tractor to protect it from dust and moisture.
Replace the air filter annually or every 100 operating hours, whichever comes first. Check it more frequently if operating in dusty conditions.
Check for corroded or loose connections, ensure the alternator is functioning properly, and consider replacing the battery if it's old.
Remove the blades following the manual's instructions, use a file or grinder to sharpen, and ensure they are balanced before reinstalling.
Inspect the blades for damage, check for loose parts, and ensure the engine is properly mounted and balanced.
Use a tire pressure gauge to check the pressure and inflate or deflate the tires as needed to match the recommended PSI listed in the manual.