Simplicity 1691542 4210G Parts Manual

Ensure the tractor is on a level surface, engage the parking brake, set the throttle to mid-range, turn the ignition key, and release once the engine starts.
Check the battery connections, ensure there is fuel in the tank, verify the spark plug is functioning, and check the fuel filter for clogs.
Change the oil every 50 hours of operation or at the beginning of each season, whichever comes first.
Use SAE 30 oil for temperatures above 32°F and SAE 10W-30 for temperatures below 32°F.
Remove the air filter cover, take out the filter, clean it with compressed air or replace it if it's too dirty, and reassemble.
Check for debris blocking the air intake, ensure the cooling fins are clean, verify coolant levels, and inspect the fan belt for damage.
Ensure the transmission fluid is at the correct level, check for leaks, inspect the drive belt for wear, and ensure the shift mechanism is not obstructed.
Drain the fuel or add a stabilizer, clean the exterior, change the oil, remove the battery and store it in a cool, dry place, and cover the tractor to protect it from the elements.
Regularly service the engine, keep tires properly inflated, reduce idling time, and use the appropriate gear when operating.
Inspect the blades for sharpness, check for damage or bending, ensure the mower deck is level, and verify the blade engagement mechanism is functioning correctly.