Simplicity 1691381 SunStar Parts Manual

To change the oil, first warm up the engine to ensure the oil flows out smoothly. Turn off the engine, remove the oil drain plug, and allow the old oil to drain completely. Replace the drain plug and remove the oil filter. Install a new filter and add new oil according to the specifications in your owner's manual.
This tractor is designed to run on regular unleaded gasoline with an octane rating of 87 or higher. Avoid using ethanol-blended fuels greater than E10.
Check the battery connections for corrosion or looseness. Ensure the battery is fully charged. Inspect the spark plugs and replace if necessary. Verify that the fuel is fresh and the fuel filter is not clogged.
Refer to the tire sidewall for the manufacturer's recommended tire pressure. Generally, it ranges between 12-15 psi for rear tires and 10-12 psi for front tires.
Park the tractor on a flat surface. Measure the distance from the ground to the blade tip on each side. Adjust the deck hangers until both sides are equal, ensuring an even cut.
Regular maintenance includes changing the oil and filter, checking and replacing air filters, inspecting the spark plugs, lubricating moving parts, and checking the belts and blades for wear.
First, disconnect the battery and remove the mower deck. Release the tension on the belt tensioner and remove the old belt. Install the new belt following the same path as the old one, ensuring it is seated properly on all pulleys. Reinstall the mower deck and reconnect the battery.
Check if the mower deck is level, blades are sharp, and tires are properly inflated. Also, ensure the deck hangers are not worn or damaged.
Remove the air filter cover and take out the air filter. If it's a paper filter, tap it gently to remove debris. If it's a foam filter, wash it with mild detergent, rinse, and allow it to dry completely before reinstalling.
Stop the engine immediately and allow it to cool. Check the coolant levels and refill if necessary. Inspect the radiator for blockages and clean it. Ensure the fan belt is intact and functioning properly.