• John Deere has a reputation for toughness and long-lasting equipment. Still, like all machines, John Deere riding mowers occasionally experience difficulties and even break down. Some of the most common problems with the mowers have been investigated, so solutions to the problems exist. You can attempt several repairs yourself before calling a technician.
  
  

Engine Performance

• Some John Deere riding mower owners experience problems with engine performance. If the engine seems to lag or run at a lower speed than normal, first check that the engine oil is the proper mixture and viscosity. If the oil is correct, inspect the fuel system (e.g. fuel line, fuel tank and cap) for dirt and grime. Old fuel can form sedimentary deposits which not only impede the function of the engine but can also damage the engine during operation. Flush the fuel system, and replace the fuel. If the mower still experiences difficulty after the fuel system is flushed, examine the carburetor for dirt deposits, and clean it thoroughly. If the problem persists, look at the action of the throttle cable to ensure it is not caught or sticking. If the John Deere riding mower continues to have engine performance issues, contact a certified technician for professional repairs.
  
  

Starter

• John Deere riding mowers, such as the X300R Tractor riding mower, use electrical starters which sometimes break down. If the mower experiences starting problems, first ensure the brake pedal is completely depressed and that the mower engagement lever is set to "Engaged" when starting the engine. If it still shows signs of problems, inspect the battery terminals for corrosion. Disconnect the battery, and clear the battery leads and terminals of corrosion; reconnect and attempt to start the mower again. If the engine still will not start, look at the fuse panel for a blown fuse. If fuses are in operating condition, test whether the battery still holds a charge.
  
  

Scalping

• Most John Deere riding mowers are designed to cut grass at several lengths, depending on your preference and the type of terrain. Occasionally a cut will scalp the lawn, leaving little or no grass left in patches. Should you experience lawn scalping with your John Deere riding mower, first examine the mower wheels to ensure they are adjusted to cut at your preferred setting. If the wheels are set properly, check the tire pressure. Low or blown tires will cause the blade to spin closer to the ground. If filling or replacing low or blown tires does not solve the problem, consult a professional technician for repairs.