Simplicity 1690931 6216 Parts Manual

Ensure the tractor is in neutral, engage the parking brake, and turn the ignition key to the start position. Release the key once the engine starts.
Use SAE 30 oil for temperatures above 32°F (0°C) and SAE 5W-30 for temperatures below 32°F (0°C).
Check the battery connections, ensure the fuel tank has gas, and verify the spark plug is functioning. Also, check for any blown fuses or faulty safety switches.
Change the oil every 50 hours of operation or at the beginning of each mowing season, whichever comes first.
Check the blade drive belt for wear or damage, ensure the PTO switch is engaged, and inspect the electrical connections related to the PTO clutch.
Regularly clean terminals and connections, ensure that the battery is charged, and check the electrolyte levels if applicable.
Refer to the owner's manual for the specific tire pressure, but generally, front tires should be inflated to 14 psi and rear tires to 10 psi.
Locate the air filter housing, remove the cover, take out the old filter, and replace it with a new one, ensuring it is seated properly before replacing the cover.
Clean the tractor, change the oil, drain the fuel system or add a fuel stabilizer, disconnect the battery, and store the tractor in a dry, covered area.
Use the height adjustment lever located near the operator's seat to set the desired cutting height, ranging from 1.5 inches to 4 inches.