Bobcat 853 Power Loss and Recovery Issues

[MikePhua]

The Bobcat 853 skid steer loader is a versatile and widely-used piece of equipment in the construction and landscaping industries. Known for its durability and compact design, the 853 offers excellent maneuverability and performance on job sites. However, like all machinery, it can experience issues from time to time. One such problem is intermittent power loss, where the machine loses power unexpectedly and then regains it after a short period. This type of issue can be frustrating and may lead to downtime if not addressed promptly. In this article, we will explore the common causes of power loss in the Bobcat 853 and provide a detailed guide for troubleshooting and resolving the issue.
Understanding the Power System of the Bobcat 853
Before diving into troubleshooting, it’s important to understand the power system of the Bobcat 853. This skid steer is powered by a diesel engine, which provides the necessary energy for its hydraulic system, drive motors, and various attachments. The engine operates in tandem with the fuel system, electrical components, and hydraulic system to ensure smooth operation. A loss of power can stem from any number of components within these systems, making it essential to systematically check each one during troubleshooting.
Potential Causes of Power Loss
When a Bobcat 853 experiences a loss of power and then regains it after a short period, it could be due to a variety of factors. Below are some of the most common causes of this issue:

1. Fuel System Problems
   The fuel system is a critical component of any diesel engine, and issues here can lead to power loss. Common fuel system problems include air in the fuel lines, clogged fuel filters, or fuel contamination. If the engine is not receiving a consistent and adequate supply of fuel, it can cause power interruptions.
   • Solution: Inspect the fuel lines for any signs of air bubbles or leaks. Check the fuel filter and replace it if it is clogged or dirty. If contamination is suspected, flush the fuel system and refill with clean fuel.
     
2. Electrical System Failures
   Intermittent power loss can also be caused by electrical problems. The Bobcat 853 relies on a 12-volt electrical system that powers key components, including the starter, alternator, and hydraulic controls. Issues such as a failing battery, loose or corroded connections, or a faulty alternator can cause the machine to lose power intermittently.
   • Solution: Start by inspecting the battery voltage and connections. Clean any corroded terminals and check the battery charge. If the battery is old or weak, consider replacing it. Also, inspect the alternator for proper function to ensure the electrical system is being properly charged.
     
3. Hydraulic System Issues
   The hydraulic system of the Bobcat 853 is responsible for powering the drive motors, lift arms, and other hydraulic attachments. If the hydraulic system is not functioning properly, it can cause a loss of power, especially under load. Common hydraulic system issues include low fluid levels, contaminated fluid, or a malfunctioning pump.
   • Solution: Check the hydraulic fluid levels and ensure that they are within the recommended range. Inspect the fluid for contamination or discoloration, and replace it if necessary. Also, check the hydraulic pump for any signs of damage or wear.
     
4. Starter and Solenoid Problems
   A faulty starter motor or solenoid can cause the engine to intermittently lose power. If the solenoid is not engaging properly, the engine may fail to start or may lose power after running for a short period.
   • Solution: Test the starter motor and solenoid to ensure they are functioning correctly. If there is any sign of failure, replace the faulty components. A quick way to test is by listening for a clicking noise when trying to start the engine, which indicates a problem with the solenoid.
     
5. Overheating or Cooling System Issues
   Overheating is another potential cause of power loss in a Bobcat 853. If the engine or hydraulic system overheats, it can trigger an automatic shutdown to prevent further damage. The cooling system, including the radiator and cooling fans, plays a crucial role in preventing overheating.
   • Solution: Check the radiator and cooling fans for proper function. Make sure the radiator is clean and free from debris, and ensure that the coolant levels are adequate. If overheating is a recurring issue, inspect the thermostat and cooling fan for any defects.
     
6. Dirty or Faulty Air Filters
   A clogged or dirty air filter can restrict airflow to the engine, causing a loss of power. This is especially true when the backhoe is operating in dusty or dirty environments. Poor air filtration can also affect fuel efficiency and engine performance.
   • Solution: Inspect and clean or replace the air filter if it appears clogged. In dusty environments, it’s recommended to check the air filter more frequently to ensure the engine is receiving sufficient airflow.
     

Step-by-Step Troubleshooting Guide
If your Bobcat 853 experiences intermittent power loss, follow these steps to diagnose and fix the issue:

1. Check the Fuel System
   • Inspect fuel lines for leaks and ensure there is no air in the lines.
     
   • Replace the fuel filter and check for contamination in the fuel.
     
   • Ensure the fuel tank is clean and free from debris.
     
2. Inspect the Electrical System
   • Check the battery voltage and inspect terminals for corrosion.
     
   • Test the alternator to ensure it is charging the battery properly.
     
   • Check all electrical connections for wear or damage.
     
3. Examine the Hydraulic System
   • Verify hydraulic fluid levels and check for leaks.
     
   • Look for signs of contamination in the hydraulic fluid.
     
   • Test the hydraulic pump for proper operation.
     
4. Test the Starter and Solenoid
   • Inspect the starter motor and solenoid for proper operation.
     
   • Check for any loose or damaged electrical connections related to the starter.
     
   • Replace faulty components as necessary.
     
5. Inspect the Cooling System
   • Clean the radiator and ensure that coolant levels are correct.
     
   • Check the operation of the cooling fan.
     
   • Inspect the thermostat for proper function.
     
6. Clean or Replace the Air Filter
   • Inspect the air filter for dirt and debris.
     
   • Replace the filter if it is clogged or damaged.
     

Preventive Maintenance Tips
To avoid future power loss issues with your Bobcat 853, regular maintenance is crucial. Here are some key maintenance practices:

• Fuel System: Regularly replace fuel filters and keep the fuel system clean. Always use high-quality diesel fuel.
  
• Battery Maintenance: Inspect the battery regularly for signs of corrosion, and ensure proper charging.
  
• Hydraulic System: Change hydraulic fluid at the recommended intervals and inspect hoses for wear or leaks.
  
• Cooling System: Clean the radiator frequently and replace coolant as per the manufacturer’s guidelines.
  
• Air Filter: Clean or replace the air filter based on operating conditions, especially in dusty environments.
  

Conclusion
Intermittent power loss in the Bobcat 853 can be caused by a variety of factors, including fuel system problems, electrical failures, hydraulic issues, and overheating. By systematically checking each component and addressing potential issues as they arise, you can ensure the reliable performance of your machine. Regular maintenance and prompt troubleshooting will help you avoid costly repairs and minimize downtime, allowing you to keep your Bobcat 853 operating at peak efficiency.