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Bobcat 773G Cold Start Issues: Troubleshooting and Solutions
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Introduction: The Challenge of Cold Starts in Bobcat 773G
Cold start problems are a common issue for many equipment operators, especially in colder climates. The Bobcat 773G, a popular skid steer model, is no exception. While it’s known for its reliability and versatility, users sometimes face difficulties when trying to start the machine during colder weather. These cold start issues can disrupt work schedules, increase downtime, and add unnecessary repair costs if not addressed properly.
In this article, we will explore the potential causes of cold start problems in the Bobcat 773G, possible solutions, and tips for ensuring smooth operation during the winter months. Through real-world examples and expert insights, we will help you understand why these problems occur and how to prevent them from becoming an ongoing issue.
Common Causes of Cold Start Issues in the Bobcat 773G
  1. Battery Performance in Cold Weather
    The most common cause of cold start problems in the Bobcat 773G is poor battery performance in low temperatures. Batteries tend to lose their efficiency in colder climates, leading to insufficient power for starting the engine. The cold weather increases the internal resistance of the battery, making it harder for it to deliver the required cranking amps.
    • Real-World Example:
      A contractor in Canada shared their experience with cold starts on their Bobcat 773G during the winter. They noticed that the machine would crank slowly and sometimes fail to start after sitting idle overnight. Upon testing the battery, they found it had reduced capacity due to cold temperatures, which led to the starting issues.
    Solution:
    Regularly check the battery’s charge and condition. If the battery is old or losing its charge capacity, replacing it with a new one or using a higher cold-cranking amp (CCA) battery rated for colder temperatures can help improve starting performance.
  2. Fuel Problems: Gelling and Water in Diesel
    Another cause of cold start problems in the Bobcat 773G can be related to the fuel. In cold temperatures, diesel fuel can gel, thickening and clogging the fuel system, which makes it difficult for the engine to start. Additionally, water contamination in diesel fuel can freeze, further obstructing fuel flow and causing hard starts.
    • Real-World Example:
      A heavy equipment operator working in a frigid environment reported that their Bobcat 773G would start fine on warmer days, but during the winter months, the machine would often fail to start. After troubleshooting, they discovered that water had entered the fuel system, causing ice buildup and restricting fuel flow to the engine.
    Solution:
    To prevent fuel gelling, always use winter-grade diesel fuel or add a fuel additive that prevents gelling. Regularly drain the fuel water separator and change fuel filters to ensure water doesn't accumulate in the system.
  3. Glow Plug or Block Heater Issues
    The Bobcat 773G, like many diesel-powered machines, uses glow plugs to preheat the air in the cylinders before starting the engine. This helps improve cold-start reliability. If the glow plugs are faulty, or if the block heater isn't functioning properly, the engine may struggle to start in cold conditions.
    • Real-World Example:
      A mechanic servicing a Bobcat 773G noticed that the machine failed to start in cold temperatures, but it would run fine after a jump-start. After inspecting the glow plugs and block heater, they found that the glow plugs were not working correctly, preventing the engine from warming up before cranking.
    Solution:
    Regularly inspect and test the glow plugs, replacing them if necessary. In extremely cold weather, consider using a block heater to keep the engine warm overnight, ensuring it starts without issues the next morning.
  4. Starter Motor Wear and Tear
    Over time, the starter motor on the Bobcat 773G can become worn, particularly in machines that are frequently subjected to cold starts. A weak or damaged starter motor may struggle to turn the engine over in cold conditions, even when the battery and fuel systems are in good shape.
    • Real-World Example:
      One Bobcat 773G operator in the northern U.S. found that their machine would sometimes fail to crank, even with a fully charged battery and clean fuel. Upon inspection, the starter motor was found to be worn, causing it to lack the necessary torque to start the engine in colder temperatures.
    Solution:
    If the starter motor is slow to crank or is making unusual noises, it may need to be serviced or replaced. Regular maintenance of the starter motor, including cleaning and lubricating the starter drive, can extend its lifespan and improve starting performance.
Maintenance Tips to Prevent Cold Start Problems
  1. Proper Winterization of Your Equipment
    Winterizing your Bobcat 773G can go a long way in preventing cold start issues. Ensure that the cooling system is flushed, the fuel system is free of contaminants, and all fluids are appropriate for cold weather. A well-maintained machine is less likely to face problems during the winter months.
  2. Pre-Start Warm-Up Procedures
    Before attempting to start your Bobcat 773G, especially in extremely cold conditions, let the machine sit for a few minutes and allow the battery and fuel systems to stabilize. If your machine is equipped with a block heater, plug it in several hours before use to preheat the engine.
  3. Invest in a Battery Maintainer
    Using a battery maintainer, especially during the colder months, can help keep your battery in good condition by preventing it from discharging completely. A battery maintainer ensures that your Bobcat 773G always has the power it needs to start, even after sitting idle for extended periods.
  4. Regular Inspection of Key Components
    Routine inspection of the Bobcat 773G’s electrical system, fuel system, and engine components is essential to catch any issues before they turn into larger problems. Regularly checking the condition of the glow plugs, battery, fuel filter, and starter motor can help identify wear and tear before it affects cold-start performance.
Real-World Solutions and Operator Experiences
Several Bobcat 773G owners have faced cold-start issues and found success with different troubleshooting methods. A contractor in northern Europe found that a combination of using a fuel additive to prevent gelling, installing a block heater, and upgrading the battery solved their cold start problems entirely. In other cases, operators found that regularly charging the battery and replacing fuel filters in advance of winter significantly reduced the number of cold start issues.
In another case, a fleet operator shared how the use of a preemptive maintenance schedule helped avoid cold start issues altogether. By inspecting and replacing components before the cold weather hit, they were able to keep their machines running smoothly throughout the winter, preventing costly delays and repairs.
Conclusion: Preventing Cold Start Problems in Bobcat 773G
Cold start problems in the Bobcat 773G, while common in colder environments, can be managed with proper maintenance and preparation. By addressing issues such as battery performance, fuel contamination, glow plug failure, and starter motor wear, operators can reduce the risk of cold start failures and keep their machines running efficiently year-round.
In cold climates, taking proactive measures like using winter-grade diesel, installing a block heater, and maintaining the battery and electrical systems can go a long way in ensuring reliable operation. By following these best practices and real-world solutions shared by fellow operators, you can minimize downtime and keep your Bobcat 773G working smoothly in any weather.
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Bobcat 773G Cold Start Issues: Troubleshooting and Solutions - by MikePhua - Yesterday, 11:38 AM

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