Why Won't My Bobcat 753 Start? Common Causes and Solutions

[MikePhua]

The Bobcat 753 skid steer loader is a widely used piece of machinery in construction, landscaping, and agricultural work. However, some users have reported issues where their Bobcat 753 fails to start, which can halt operations and cause delays. This problem can stem from various causes, including issues with the electrical system, fuel system, or starting components. In this article, we’ll explore the common reasons why a Bobcat 753 may fail to start and provide troubleshooting steps and solutions.
Common Causes of a Bobcat 753 Not Starting

1. Battery Voltage Issues
   A low battery is one of the most common causes of a Bobcat 753 failing to start. If the battery doesn't have enough charge, it won't supply the necessary power to the starter motor, resulting in a failure to start the engine. This issue is often seen when the machine has been sitting unused for an extended period, or if the battery is old and no longer holds a charge.
   
2. Starter Motor Problems
   A malfunctioning starter motor can also prevent the Bobcat 753 from starting. If the starter motor is damaged or the electrical connections are poor, the engine won't turn over. If you hear a clicking or grinding noise when attempting to start, the starter motor or related components might be the problem.
   
3. Fuel System Problems
   The fuel system plays a crucial role in getting the engine running. If there’s an issue with the fuel pump, fuel filter, or fuel lines, the engine may not receive adequate fuel, preventing it from starting. A clogged fuel filter or a leaking fuel line can cause fuel delivery problems, making it impossible to start the engine.
   
4. Fuel Quality Issues
   If the Bobcat 753 has been sitting idle for a long time or if poor-quality fuel has been used, it can cause issues in the fuel system. Contaminated or old fuel may clog the fuel lines or prevent the engine from receiving the right amount of fuel, leading to starting problems.
   
5. Fuses or Relays Problems
   Blown fuses or faulty relays can prevent the electrical system from functioning correctly. A small issue in the electrical system, such as a malfunctioning fuse or relay, can result in a failure to start the machine. It’s essential to check and replace any blown fuses or faulty relays to restore the proper function of the electrical system.
   

Troubleshooting and Solutions

1. Check Battery Voltage and Connections
   The first step is to check the battery voltage. Use a multimeter to ensure the battery is providing at least 12 volts. If the battery voltage is low, recharge or replace the battery. Also, inspect the battery terminals for corrosion or loose connections. Clean the terminals and tighten the connections if needed.
   
2. Inspect the Starter Motor and Electrical Circuit
   If the battery is functioning properly but the machine still won't start, inspect the starter motor. Check the wiring and connections to the starter motor, as well as the starter relay. If you hear clicking or the motor is unresponsive, it could be a sign of a faulty starter motor or damaged electrical circuit. Replace or repair any faulty components as needed.
   
3. Inspect the Fuel System
   Next, check the fuel system for any issues. Ensure the fuel pump is working and that the fuel filter is not clogged. Replace the fuel filter if it's dirty or clogged. Inspect the fuel lines for leaks, and make sure the fuel is flowing properly to the engine. If necessary, replace the fuel pump or repair any damaged fuel lines.
   
4. Check the Fuel Quality
   If the machine has been sitting idle for an extended period, check the fuel quality. Stale or contaminated fuel can clog the fuel system and prevent the engine from starting. Drain the old fuel and refill with fresh, clean fuel. Clean the fuel system to remove any contaminants or debris that may have accumulated.
   
5. Inspect Fuses and Relays
   Check the fuses and relays in the electrical system. Look for any blown fuses or faulty relays, as these can prevent the starting circuit from working. Refer to the user manual for the location of the fuses and relays, and replace any that are damaged.
   

Preventive Measures

1. Regular Battery Maintenance
   To avoid battery-related starting problems, regularly check the battery voltage and condition. Clean the terminals to prevent corrosion and check the connections for any looseness. If the battery is old, consider replacing it to ensure reliable starting.
   
2. Fuel System Maintenance
   Regularly replace the fuel filter and use high-quality fuel to prevent fuel system clogs. Avoid using old or poor-quality fuel, as it can damage the fuel system and cause starting issues. If the machine has been sitting for a while, always drain and replace the fuel.
   
3. Check the Starter Motor and Electrical Components
   Inspect the starter motor, relays, and other electrical components regularly. Make sure they are in good working order to avoid electrical starting issues. A thorough inspection and maintenance of the electrical system can prevent future problems.
   
4. Use the Machine Regularly
   Frequent use of the Bobcat 753 ensures the battery stays charged, and the fuel system remains functional. If the machine is not in use for extended periods, consider periodically starting it to keep the systems in good working order.
   

Conclusion
If your Bobcat 753 isn’t starting, the issue could be due to several factors, including battery problems, starter motor issues, fuel system failure, or electrical component malfunctions. By following the troubleshooting steps outlined above, you can identify and resolve the issue. Regular maintenance of the battery, fuel system, and electrical components will help prevent starting problems in the future and ensure the machine runs smoothly when you need it most.