Bobcat 763 Skid Steer Won't Crank: Troubleshooting and Solutions

[MikePhua]

Bobcat 763 skid steers are versatile, reliable machines commonly used in construction and landscaping. However, like all machinery, they can experience issues from time to time. One of the most frustrating problems is when the engine refuses to crank, leaving operators stranded and unable to continue work. This issue can be caused by several factors, ranging from simple electrical problems to more complex mechanical failures. In this article, we’ll explore common causes of a Bobcat 763 skid steer not cranking and offer practical solutions to help you get back to work as quickly as possible.
Understanding the Bobcat 763 Skid Steer
The Bobcat 763 is a well-known compact loader used for a variety of tasks, including digging, lifting, and loading. Powered by a diesel engine, it’s designed to operate efficiently on tough jobsites. However, like many machines, the Bobcat 763 is prone to issues that can prevent it from starting. When the engine won't crank, the problem could lie in the electrical system, the fuel system, or even the starter itself.
Common Causes of a Bobcat 763 Not Cranking
Several different factors can prevent the Bobcat 763 from cranking. Let’s break down the most common causes:

1. Dead or Weak Battery
   • Cause: A dead or weak battery is often the first suspect when a machine won’t crank. Over time, batteries lose their ability to hold a charge, especially under harsh working conditions.
     
   • Solution: Check the battery’s charge and condition. If the battery is dead or damaged, replace it with a new one. Also, inspect the battery cables for corrosion or loose connections. If corrosion is present, clean the terminals and reconnect the cables properly.
     
2. Faulty Starter Motor
   • Cause: A malfunctioning starter motor can prevent the engine from turning over. If you hear a clicking sound when you try to start the machine, the starter motor is likely the culprit.
     
   • Solution: Check the starter motor for signs of wear or damage. A bad starter motor may need to be replaced. Sometimes, cleaning the starter or checking for wiring issues can resolve the problem, but in most cases, replacing the starter motor is the best course of action.
     
3. Blown Fuses or Relays
   • Cause: Fuses or relays are essential components in the electrical system of the Bobcat 763. If one of these components blows, it can prevent the engine from cranking.
     
   • Solution: Inspect the fuses and relays in the fuse box for any signs of damage. Replace any blown fuses or faulty relays with new ones of the correct rating. If the fuses keep blowing, it could indicate a deeper electrical issue that needs to be addressed by a mechanic.
     
4. Fuel System Issues
   • Cause: If the fuel system is compromised, the engine may not crank. This could be due to a clogged fuel filter, air in the fuel lines, or a malfunctioning fuel pump.
     
   • Solution: Check the fuel filter to see if it’s clogged. A dirty fuel filter can restrict the flow of fuel to the engine, preventing it from starting. Also, inspect the fuel lines for leaks or damage. If there’s air in the fuel system, it may need to be bled to restore normal function. Lastly, check the fuel pump to ensure it's working properly.
     
5. Worn or Faulty Ignition Switch
   • Cause: The ignition switch controls the flow of electricity to the starter motor. If it’s worn out or faulty, it can prevent the engine from cranking.
     
   • Solution: Test the ignition switch by turning the key and checking if there’s any response. If there’s no response, the ignition switch may need to be replaced. It’s a relatively inexpensive repair, but it’s crucial to ensure that all electrical connections are functioning correctly.
     
6. Safety Switch Issues
   • Cause: Skid steers like the Bobcat 763 are equipped with several safety switches that prevent the engine from starting under certain conditions (e.g., if the parking brake isn’t engaged or the seatbelt isn’t fastened).
     
   • Solution: Check all safety switches to ensure they are in the correct position. Engage the parking brake, make sure the seatbelt is fastened, and verify that the throttle and other controls are in the neutral position. If a safety switch is faulty, it may need to be repaired or replaced.
     
7. Faulty Solenoid
   • Cause: The solenoid is responsible for transmitting power from the battery to the starter motor. If it’s faulty or worn out, it can prevent the engine from cranking.
     
   • Solution: Test the solenoid to see if it’s functioning properly. If you hear a clicking noise when trying to start the engine, but the motor doesn’t turn over, the solenoid could be the issue. Replacing the solenoid may be necessary to restore normal function.
     

Step-by-Step Troubleshooting
If your Bobcat 763 won’t crank, follow these steps to troubleshoot the issue:

1. Check the Battery: Start by testing the battery. Use a voltmeter to measure the battery voltage. A fully charged battery should read about 12.6 volts. If it’s lower than this, try charging the battery or replace it if it’s too old or damaged.
   
2. Inspect the Starter Motor: If the battery is fine, move on to the starter motor. Listen for any clicking sounds when turning the key. If the starter isn’t turning, check the wiring to ensure everything is connected properly. If there’s no sign of life, the starter motor may need to be replaced.
   
3. Check Fuses and Relays: Inspect the fuses and relays in the fuse box. If any fuses are blown, replace them with the correct rating. Test the relays to ensure they are functioning properly.
   
4. Examine the Fuel System: If the electrical system seems fine, inspect the fuel system. Check the fuel filter and lines for any blockages or leaks. Ensure there’s no air in the fuel lines, and inspect the fuel pump to make sure it’s operating correctly.
   
5. Inspect the Ignition Switch and Safety Switches: Test the ignition switch by turning the key and checking for a response. If there’s no response, replace the switch. Also, make sure all safety switches (parking brake, seatbelt, throttle) are engaged and functioning properly.
   

Preventative Maintenance Tips
To avoid future problems with your Bobcat 763, here are some preventative maintenance tips:

• Battery Care: Regularly check and clean the battery terminals to prevent corrosion. If the battery is more than three years old, consider replacing it before it fails.
  
• Regular Fluid Changes: Change the oil and fuel filters as recommended by the manufacturer. Keeping your fuel system clean helps avoid clogs and ensures reliable starting.
  
• Check Safety Systems: Periodically inspect all safety switches to make sure they are working properly. Replace any faulty switches promptly.
  
• Starter and Electrical System: Regularly check the starter motor and electrical components for signs of wear. Cleaning connections and inspecting the solenoid can help extend the lifespan of your electrical system.
  

Conclusion
The Bobcat 763 is a reliable machine, but it can experience starting issues due to a variety of factors. By understanding the common causes of these issues—such as a dead battery, faulty starter motor, or clogged fuel system—you can quickly identify the root cause and get your skid steer back up and running. Regular maintenance, including checking the electrical system, fuel system, and safety switches, will go a long way in preventing these problems from arising in the first place.