Murray 312006x78B Parts Manual

Ensure the tractor is on a flat surface, engage the parking brake, place the throttle in the 'fast' position, and turn the ignition key to start the engine.
Check the battery connections, ensure the fuel tank has fuel, verify the spark plug is intact, and check if the safety interlock system is properly engaged.
Change the oil after the first 5 hours of use, then every 50 hours of operation or at the beginning of each season.
Use SAE 30 oil for temperatures above 32°F and SAE 5W-30 for colder conditions.
Regularly sharpen or replace the mower blades, ensure the deck is level, and mow at the recommended speed.
Excessive vibration could be due to unbalanced or damaged blades, loose parts, or debris caught in the mower deck.
Turn off the engine, disconnect the spark plug, and use a garden hose to wash away grass clippings and debris. Always ensure the deck is dry before use.
Check the drive belt for wear or damage and ensure it is properly tensioned. Replace the belt if necessary.
Clean the tractor thoroughly, change the oil, add a fuel stabilizer, remove the battery, and store the tractor in a dry, covered area.
Regularly check and maintain fluid levels, inspect belts and blades, clean the air filter, and lubricate moving parts.