Simplicity 1690726 7117S Parts Manual

To change the oil, first ensure the tractor is on a level surface. Remove the oil drain plug and let the old oil drain completely. Replace the drain plug, and then refill the engine with the recommended oil type and amount specified in the owner's manual.
Regular maintenance includes checking the oil level before each use, changing the oil after every 50 hours of operation, cleaning or replacing the air filter every 25 hours, and inspecting the belts and blades regularly for wear and tear.
Check if the battery is charged and the connections are clean and tight. Ensure the fuel is fresh and the fuel filter is not clogged. Inspect the spark plug for fouling and replace if necessary.
Check the PTO (Power Take-Off) switch and ensure it is in the 'on' position. Inspect the belt for any damage or slippage and adjust or replace if needed. Ensure the deck is clear of debris.
Ensure the blades are sharp and balanced. Adjust the deck level to ensure even cutting. Mow at the recommended speed and overlap passes slightly to avoid missed strips.
Use unleaded gasoline with an octane rating of 87 or higher. Avoid using ethanol blends higher than 10% to prevent engine damage.
Locate the spark plug wire and disconnect it. Use a spark plug wrench to remove the old spark plug. Install a new, correctly gapped spark plug and reconnect the wire.
Inspect the blades for damage or imbalance. Check if the engine mounting bolts are loose. Examine the drive belts for wear and replace if necessary.
Clean the tractor thoroughly to remove grass and debris. Change the oil and add a fuel stabilizer to the tank. Remove the battery and store it in a cool, dry place. Cover the tractor to protect it from dust and moisture.
Check the transmission fluid level and ensure it is adequate. Inspect the drive belt for wear and tension. If problems persist, consult the manual or contact a professional technician.