Briggs & Stratton 40370x50B Parts Manual

To start the tractor, ensure that it is on a level surface and the parking brake is engaged. Insert the key into the ignition and turn it to the 'start' position while holding down the brake pedal. Release the key once the engine starts.
Check the fuel level to ensure there is enough gas. Inspect the battery connections for corrosion and ensure they are tight. Verify the spark plug is clean and properly gapped. If the problem persists, consult the user manual or contact a professional for further diagnosis.
Regular maintenance should be performed every 50 hours of operation or at least once a year. This includes changing the oil, replacing the air filter, checking the spark plug, and inspecting the belts and blades for wear.
Briggs & Stratton recommends using a high-quality SAE 30 oil above 40°F (4°C) and a 10W-30 oil in colder temperatures. Always refer to the owner’s manual for specific oil recommendations and capacities.
To change the oil, start the tractor to warm up the engine, then turn it off and disconnect the spark plug wire. Place an oil pan under the engine, remove the oil drain plug, and allow the old oil to drain completely. Replace the drain plug and refill with new oil as per the manufacturer's specifications.
Inspect the blades for dullness or damage. Sharpen or replace the blades as necessary. Also, check that the blade belt is tight and in good condition. If issues persist, check the spindle assembly for wear.
Clean the tractor thoroughly, removing all grass and debris. Add a fuel stabilizer to the tank and run the engine for a few minutes to circulate. Change the oil and air filter, and remove the battery for storage in a cool, dry place. Cover the tractor to protect it from dust and moisture.
Excessive vibration can be caused by unbalanced or damaged blades, worn belts, or loose engine mounting bolts. Inspect and balance or replace the blades as needed, check the belts for wear, and tighten any loose bolts.
Regular maintenance, such as keeping the air filter clean and ensuring the spark plug is in good condition, can improve fuel efficiency. Additionally, avoid idling the engine for long periods and operate the tractor at recommended speeds.
Check the engine cooling fins and remove any debris blocking airflow. Ensure the oil level is sufficient and clean the air filter. If the problem continues, inspect the cooling system for leaks or blockages and consult a professional if necessary.