Briggs & Stratton 312003x50B Parts Manual
![Briggs & Stratton 312003x50B Tractor manual cover](/images/SFPPgqkzZYGscEIpNLypwGgx/thumbs/thumb175x175.webp)
To change the oil, first run the engine for a few minutes to warm it up. Turn off the engine and remove the oil drain plug. Allow the old oil to drain completely, then replace the plug. Add new oil through the oil fill port and check the level with the dipstick.
Use clean, fresh, unleaded gasoline with an octane rating of 87 or higher. Avoid fuel with more than 10% ethanol to prevent engine damage.
Check the battery charge, ensure the fuel tank has fresh gasoline, inspect the spark plug for wear, and ensure the air filter is clean. Also, make sure all safety switches are properly engaged.
Perform an oil change every 50 hours of operation or annually. Replace the air filter and spark plug every season or every 100 hours. Regularly inspect and clean the mower deck, blades, and belts.
Use the height adjustment lever located on the tractor chassis. Move the lever to the desired cutting height position, ensuring that each wheel is set to the same height for an even cut.
Excessive vibration may be caused by an unbalanced blade, debris caught in the mower deck, or loose mounting bolts. Inspect the blade for damage and balance, clear any debris, and tighten all bolts securely.
Stop the engine immediately and allow it to cool. Check for obstructions in the air intake and cooling fins. Ensure the oil level is adequate and the oil is clean.
Disconnect the spark plug wire for safety. Remove the mower deck, then release the tension on the drive belt by adjusting the idler pulley. Remove the old belt and install a new one, ensuring it is routed correctly. Reassemble all components.
Uneven cutting may be due to improperly inflated tires, a bent or dull blade, or an uneven mower deck. Check tire pressure, sharpen or replace the blade, and ensure the deck is level.
To winterize, clean the tractor thoroughly, perform an oil change, and add a fuel stabilizer to the gasoline. Remove the battery and store it in a cool, dry place. Cover the tractor to protect it from dust and moisture.