Troubleshooting Common Issues with the Bobcat 873 G Skid Steer Loader

[MikePhua]

The Bobcat 873 G is a versatile and powerful skid steer loader designed to handle a variety of tasks, from digging and lifting to grading and hauling. This model, part of Bobcat's popular 800 series, is known for its strong performance, compact design, and reliable hydraulic system. However, like any piece of heavy equipment, the Bobcat 873 G may experience certain issues over time that can affect its performance.
In this article, we will explore some of the common issues faced by owners of the Bobcat 873 G, provide troubleshooting steps, and offer solutions to ensure optimal operation and longevity of the skid steer loader.
Common Issues with the Bobcat 873 G Skid Steer Loader
While the Bobcat 873 G is generally reliable, operators may encounter several common problems, particularly with its engine, hydraulic system, and electrical components. Below are some of the typical issues and their potential causes.
1. Hydraulic System Problems

• Symptoms: Loss of lifting power, slow or unresponsive attachment movement, or erratic hydraulic performance.
  
• Potential Causes:
  • Low Hydraulic Fluid: A common issue that can cause the hydraulic system to malfunction. If the fluid levels are too low, the system won’t be able to generate sufficient pressure, leading to poor attachment performance or unresponsive controls.
    
  • Contaminated Hydraulic Fluid: Dirt, water, or debris in the hydraulic fluid can clog filters and reduce the system’s ability to perform efficiently. This can also lead to damage to hydraulic components over time.
    
  • Worn Hydraulic Hoses or Fittings: Leaks in the hydraulic lines can result in a loss of pressure and fluid, leading to slow or unresponsive movement.
    
  • Faulty Hydraulic Pump: If the hydraulic pump fails, the entire system’s performance can be compromised.
    
• Solution:
  • Check the hydraulic fluid levels regularly and top them up as needed. Always use the recommended hydraulic fluid type.
    
  • Replace the hydraulic fluid and filters if they are contaminated. Flushing the system can help remove debris and extend the life of the system.
    
  • Inspect the hydraulic hoses and fittings for leaks. Replace any damaged hoses immediately.
    
  • If the hydraulic pump is suspected to be faulty, it should be tested and replaced if necessary.
    

2. Engine Starting Issues

• Symptoms: Difficulty starting the engine, or the engine fails to start altogether. This issue can be particularly frustrating when you're on a tight schedule.
  
• Potential Causes:
  • Weak Battery: A weak or dead battery is one of the most common causes of starting issues. The battery might not have enough charge to start the engine, especially in cold weather.
    
  • Faulty Starter Motor: If the starter motor is malfunctioning, it may not engage properly, preventing the engine from turning over.
    
  • Dirty or Clogged Fuel Filter: A clogged fuel filter can restrict fuel flow to the engine, making it hard to start.
    
  • Air in the Fuel System: If air enters the fuel system, it can cause starting problems or rough idling.
    
• Solution:
  • Check the battery for corrosion or damage, and ensure it is fully charged. Replace the battery if necessary.
    
  • Test the starter motor and replace it if it is found to be faulty.
    
  • Clean or replace the fuel filter regularly to ensure proper fuel flow.
    
  • Bleed the fuel system to remove any air pockets. This may involve manually priming the fuel system or checking for leaks in the fuel lines.
    

3. Electrical System Issues

• Symptoms: Malfunctioning dashboard lights, failure of electrical components such as lights or wipers, or erratic operation of the control panel.
  
• Potential Causes:
  • Blown Fuses or Relays: A blown fuse or faulty relay can interrupt the power supply to various electrical components, causing them to stop functioning.
    
  • Loose or Corroded Battery Terminals: Loose or corroded battery terminals can cause a poor connection, leading to electrical issues.
    
  • Faulty Alternator: If the alternator is not charging the battery properly, the machine may experience intermittent electrical problems, especially when the battery voltage drops.
    
• Solution:
  • Inspect and replace any blown fuses or faulty relays.
    
  • Clean the battery terminals and ensure they are properly tightened to avoid poor electrical connections.
    
  • Test the alternator and ensure it is charging the battery correctly. If necessary, replace the alternator.
    

4. Hydraulic Leaks and Slow Movement

• Symptoms: If the machine’s boom, bucket, or attachments move slowly or become unresponsive, or if there’s a noticeable drop in hydraulic fluid, this could indicate a hydraulic leak.
  
• Potential Causes:
  • Damaged Hydraulic Seals: Over time, seals can wear out, allowing fluid to leak and reducing system efficiency.
    
  • Cracked Hydraulic Lines: Hydraulic lines can crack or become damaged due to wear and tear, resulting in leaks.
    
  • Loose Hydraulic Fittings: If hydraulic fittings are not properly tightened, they can cause leaks and a loss of hydraulic pressure.
    
• Solution:
  • Inspect hydraulic hoses, lines, and seals for damage or wear. Replace any damaged parts.
    
  • Ensure all hydraulic fittings are tight and leak-free. Use the appropriate torque specifications when tightening fittings to prevent leaks.
    

5. Uneven Lifting or Worn Out Tires

• Symptoms: Uneven lifting performance or difficulty lifting heavy loads, or one side of the loader seems to be operating slower than the other.
  
• Potential Causes:
  • Uneven Tire Wear: Uneven tire wear can cause the machine to become unbalanced, affecting its lifting capacity and stability.
    
  • Low Tire Pressure: Low tire pressure can lead to poor traction and uneven weight distribution.
    
  • Hydraulic Imbalance: If one side of the loader is lifting slower than the other, there could be an imbalance in the hydraulic system, often caused by a failing pump, hose, or valve.
    
• Solution:
  • Check the tire pressure regularly and ensure it matches the recommended specifications.
    
  • Inspect the tires for uneven wear and replace them as necessary. Properly balanced tires help ensure even lifting and optimal traction.
    
  • Check the hydraulic system for any issues that might cause an imbalance, such as a damaged pump or valve, and repair as needed.
    

General Maintenance Tips for the Bobcat 873 G
Proper maintenance is crucial to keeping the Bobcat 873 G in optimal working condition. Here are some key maintenance tips:

• Perform Regular Oil Changes: Change the engine oil and hydraulic oil at the recommended intervals to ensure the machine runs smoothly and to prevent premature engine or hydraulic system failure.
  
• Check and Replace Filters: Regularly check and replace the air, fuel, and hydraulic filters to maintain proper flow and prevent contaminants from entering the system.
  
• Inspect Hydraulic Hoses and Fittings: Check hydraulic hoses for wear, cracks, or leaks, and replace them promptly to prevent costly hydraulic system failures.
  
• Grease Moving Parts: Lubricate moving components such as joints, pivot points, and tracks regularly to reduce friction and prevent wear.
  
• Keep the Cooling System Clean: Ensure the radiator and cooling system are free from dirt and debris to avoid overheating.
  
• Monitor Battery and Electrical System: Keep the battery terminals clean and ensure the alternator is functioning properly to avoid electrical issues.
  

Conclusion
The Bobcat 873 G skid steer loader is a powerful and reliable piece of equipment, but like any machine, it can experience issues over time. By understanding common problems such as hydraulic system malfunctions, engine starting issues, electrical failures, and uneven lifting, owners can troubleshoot and address these issues efficiently. Regular maintenance, including checking fluid levels, inspecting components for wear, and ensuring proper lubrication, is essential to keeping the Bobcat 873 G running smoothly. With proactive care, the Bobcat 873 G can provide years of dependable service.