Simplicity Yeoman 648 Owner's Manual

To change the oil, warm up the engine, then turn it off. Locate the oil drain plug under the engine, place an oil pan underneath, and remove the plug. Allow the oil to fully drain, replace the plug, and refill with the recommended oil type and quantity.
Refer to the owner's manual for the recommended oil type, which is typically SAE 30 for temperatures above 32°F and 10W-30 for colder climates. Ensure the oil meets the API service classification SF, SG, or SH.
Check the battery connections for corrosion or looseness. Ensure the battery is fully charged. Examine the spark plug for fouling or wear, and replace if necessary. Verify the fuel level and inspect the fuel filter for clogs.
Inspect the PTO (Power Take-Off) switch and ensure it is engaged. Check the drive belt for wear or damage, and replace if needed. Examine the blade engagement cable for proper tension and connectivity.
Regularly clean the mower deck to remove grass build-up. Check the deck belt for signs of wear and replace as necessary. Sharpen the blades every 25 hours of use or more frequently if cutting rough terrain.
Drain the fuel tank or add a fuel stabilizer to prevent gum deposits. Change the oil and replace the oil filter. Remove the battery and store it in a cool, dry place. Clean the tractor thoroughly and cover it to protect against dust and moisture.
Replace the air filter every 100 hours of operation or annually, whichever comes first. Check the filter more frequently in dusty conditions and clean or replace it as necessary.
Inspect the blades for balance and sharpness. Ensure the deck is level and the tires are inflated to the correct pressure. Check for loose bolts or components and tighten them as needed.
Locate the cutting height adjustment lever, typically found on the fender or the mowing deck. Move the lever to the desired cutting height position, ensuring it is securely locked in place.
Perform regular oil changes every 50 hours of operation. Clean or replace the air filter every 100 hours. Check tire pressure, inspect belts, and sharpen blades regularly. Lubricate moving parts and check for loose bolts and connections.