Murray 40509x92A Parts Manual

To change the oil, first warm up the engine then shut it off. Locate the oil drain plug under the engine. Place a pan beneath it and remove the plug to drain the old oil. Replace the plug, remove the oil filter, and install a new one. Finally, add new oil through the oil fill cap.
If your tractor won't start, check the battery connections for corrosion or looseness. Ensure the fuel tank has gasoline and the fuel line is not blocked. Additionally, check the spark plug for wear or damage and replace if necessary.
To adjust the cutting height, locate the height adjustment lever on the side of the mower deck. Move the lever to the desired position to raise or lower the deck. Ensure the deck is level after adjustment.
First, remove the spark plug wire to prevent accidental starting. Tilt the mower and remove the blades using a wrench. Secure the blade in a vice and use a file or grinding wheel to sharpen the edge. Balance the blade before reinstalling it.
To replace the drive belt, first disconnect the spark plug wire. Remove the mower deck and locate the belt guides. Release the tension on the belt, remove it from the pulleys, and install the new belt following the same path. Reassemble the mower deck.
An overheating engine could be caused by clogged air filters or a buildup of debris around the engine. Clean the engine area and replace the air filter if dirty. Ensure the cooling fins are unobstructed and check the oil level.
Regular maintenance includes checking and changing the oil, replacing or cleaning the air filter, sharpening the blades, checking tire pressure, and inspecting belts for wear. Lubricate all moving parts and check battery health regularly.
To winterize, remove all fuel or add fuel stabilizer to a full tank. Clean the tractor thoroughly, change the oil, and check the antifreeze level if applicable. Store the tractor in a dry, sheltered place and disconnect the battery.
Uneven cutting can result from a damaged or dull blade, improper deck leveling, or tire pressure discrepancies. Ensure the blades are sharp and balanced, check the deck is level, and maintain even tire pressure on all wheels.
Excessive vibration could be due to unbalanced blades or damaged components. Check that the blades are balanced and not bent. Inspect the spindle and mower deck for damage. Tighten any loose parts and replace worn components.