Murray 405625x51A-SW Parts Manual

To change the oil, start by running the engine for a few minutes to warm it up. Turn off the engine and remove the oil drain plug, allowing the old oil to drain completely. Replace the drain plug and refill the engine with new oil, using the type and quantity specified in the manual.
Check the battery connections to ensure they are clean and tight. Verify that there is fuel in the tank. Inspect the spark plug for wear or damage and replace if necessary. If the problem persists, consult a professional technician.
Locate the cutting height adjustment lever, usually situated near the driver's seat. Move the lever to the desired position, which corresponds to the cutting height you want. Ensure the deck is level for an even cut.
Follow the manufacturer's maintenance schedule, which typically includes checking the oil level, air filter, and tire pressure before each use, and performing more in-depth checks and replacements every 25 to 50 hours of operation.
Disconnect the spark plug wire and use a spark plug socket to remove the old plug. Check the gap on the new spark plug and adjust it if necessary. Install the new plug by hand to avoid cross-threading, then tighten with the socket. Reattach the spark plug wire.
Use regular unleaded gasoline with a minimum octane rating of 87. Avoid using gasoline with more than 10% ethanol content to prevent engine damage.
Check if the mower deck is level. Inspect the blades for sharpness and damage, replacing if necessary. Verify tire pressure is even on all wheels. Ensure the grass is not too wet or too high for the current cutting height setting.
Inspect the air filter every 25 hours of operation or every season. Replace it if it's dirty or damaged. Regular replacement ensures optimal engine performance and fuel efficiency.
Clean the tractor thoroughly and change the oil. Add fuel stabilizer to a full tank of gas. Remove the battery and store it in a cool, dry place. Check and inflate the tires to the recommended pressure. Cover the tractor to protect it from dust and moisture.
Disconnect the spark plug and remove the mower deck from the tractor. Use a wrench to remove the blade. Secure the blade in a vice and sharpen the cutting edge with a file or grinder, maintaining the original angle. Balance the blade before reinstalling.