Simplicity 1692136 SunStar Parts Manual

To change the oil, first warm up the engine. Turn off the engine and remove the oil drain plug. Allow the old oil to drain completely. Replace the drain plug and fill with the recommended oil type and amount as specified in the manual.
Check the battery connections to ensure they are clean and tight. Verify that the fuel tank has fuel and the fuel valve is open. Inspect the spark plug for wear or damage and replace if necessary.
Regularly clean the mower deck to prevent grass buildup. Sharpen the blades at least once a season. Check the belt for wear and replace if needed. Also, lubricate the spindles and other moving parts as per the maintenance schedule.
Use unleaded gasoline with an octane rating of at least 87. Avoid using gasoline with more than 10% ethanol.
Check that the tire pressure is equal on all sides. Inspect the mower deck for levelness and adjust if necessary. Ensure the blades are sharp and not bent.
Refer to the owner's manual for the specific tire pressure recommendation, but generally, it's around 12-15 PSI for the front tires and 10-12 PSI for the rear tires.
Ensure the radiator fins are clean and unobstructed. Check the coolant level regularly and refill as needed. Also, verify that the fan belt is in good condition and properly tensioned.
Excessive vibration can be caused by unbalanced blades, worn pulleys, or loose bolts. Inspect these components and tighten or replace them as needed.
The air filter should be checked every 25 hours of operation and replaced every 100 hours or annually, whichever comes first.
Clean the tractor thoroughly and change the oil. Add a fuel stabilizer to the fuel tank. Remove the battery and store it in a cool, dry place. Cover the tractor to protect it from dust and moisture.