Bobcat 843 Skid Steer Loader: Features, Issues, and Maintenance

[MikePhua]

The Bobcat 843 skid steer loader is a versatile piece of heavy equipment known for its agility and power in a wide range of applications, from construction to landscaping. Produced during the late 1980s and into the 1990s, the 843 model represents an older but reliable skid steer design that still sees use in many work sites. Despite its durability, like any piece of machinery, it is not without issues. In this article, we will explore the features of the Bobcat 843, common problems that operators encounter, and effective maintenance practices to extend its lifespan.
Overview of the Bobcat 843
The Bobcat 843 is part of the popular Bobcat series of skid steer loaders, which are known for their compact size and robust performance. These machines are ideal for jobs that require high mobility in tight spaces, such as excavation, demolition, and material handling. The 843, specifically, was designed with a strong emphasis on power, efficiency, and easy maintenance, making it a favorite in both urban and rural construction environments.

• Engine: The Bobcat 843 is equipped with a 49 horsepower (36.5 kW) engine, typically powered by a diesel engine, although gasoline variants were also available. This power allows it to handle various attachments and heavy loads, making it a versatile machine.
  
• Hydraulic System: The 843 is known for its strong hydraulic system, capable of lifting and carrying heavy materials. Its operating capacity is about 1,400 pounds (635 kg), making it suitable for lifting large quantities of dirt, gravel, and other materials.
  
• Dimensions and Performance: With an overall length of approximately 10 feet and a width of 5.5 feet, the Bobcat 843 provides a balanced blend of compactness and stability. It has a top speed of about 7 mph (11 km/h), which is typical for skid steer loaders of this class.
  

Common Issues with the Bobcat 843
While the Bobcat 843 is known for its reliability, there are several issues that owners and operators frequently encounter. These problems, if left unchecked, can affect the loader’s performance and longevity. Below are some of the most common concerns with the 843 model:
1. Hydraulic System Problems
One of the most common issues with older Bobcat 843 models is hydraulic system failure. The hydraulic components, such as the pump, hoses, and cylinders, are prone to wear and tear over time. Common signs of hydraulic problems include:

• Slow or weak operation of the boom and bucket
  
• Leaks around hydraulic fittings or cylinders
  
• Unusual noises coming from the hydraulic system
  

Solution: Regular maintenance and monitoring of the hydraulic fluid level can prevent most hydraulic issues. It’s also important to inspect the hydraulic pump for wear, check for leaks, and replace any worn-out hoses or seals.
2. Electrical System Failures
Electrical issues can also plague the Bobcat 843, particularly in older models where wiring may degrade or connectors corrode. Symptoms include failure to start, erratic operation of electrical components, or non-functioning lights.
Solution: Check the battery and all electrical connections regularly. Clean the terminals to prevent corrosion and ensure a good connection. It’s also recommended to inspect fuses and relays and replace them if necessary.
3. Engine Starting Problems
Bobcat 843 owners may experience difficulties starting the engine, especially in colder weather. This could be due to issues such as worn-out spark plugs, fuel delivery problems, or a failing starter motor.
Solution: Inspect and replace spark plugs as necessary, check the fuel filter for clogs, and ensure the fuel lines are clear. If the starter motor is not functioning correctly, it may need to be replaced.
4. Overheating
Another common issue with older machines like the Bobcat 843 is overheating. This problem can arise from a malfunctioning radiator, insufficient coolant levels, or a worn-out fan. Overheating can lead to engine damage if not addressed promptly.
Solution: Regularly inspect the cooling system, ensure that the coolant is at the proper level, and check the radiator and fan for blockages. Cleaning the radiator and replacing any worn-out parts can help prevent overheating.
5. Wear and Tear on the Undercarriage
As with any skid steer, the undercarriage of the Bobcat 843 is subject to significant wear and tear, especially if the machine is used on rough or uneven terrain. Worn-out tires, tracks, or rollers can affect the loader’s stability and maneuverability.
Solution: Regularly inspect the undercarriage for damage. Replace worn tires or tracks promptly, and ensure that all rollers and bearings are properly lubricated and functioning.
Maintenance Tips for Extending the Life of Your Bobcat 843
Maintaining your Bobcat 843 skid steer loader is essential for keeping it running smoothly and extending its service life. Here are some key maintenance practices to keep in mind:
1. Regular Fluid Checks
It’s essential to monitor the levels of engine oil, hydraulic fluid, and coolant. Running the loader with insufficient fluid can cause significant damage to the engine and hydraulic components.

• Engine Oil: Check the oil level before each use and change the oil regularly according to the manufacturer’s recommendations.
  
• Hydraulic Fluid: Inspect the hydraulic fluid levels frequently. Low fluid can cause erratic operation, while contaminated fluid can damage hydraulic components.
  
• Coolant: Ensure that the coolant is at the correct level and free of contaminants to prevent the engine from overheating.
  

2. Inspect and Replace Filters
Filters should be replaced regularly to ensure optimal performance. This includes the engine air filter, fuel filter, and hydraulic filters. Clogged or dirty filters reduce efficiency and can lead to expensive repairs.
3. Tire and Track Maintenance
Check the tires or tracks regularly for wear and damage. Worn tires can compromise the loader’s stability and traction, while damaged tracks can cause a loss of mobility. For loaders with tracks, ensure they are properly tensioned.
4. Electrical System Care
Keep the battery terminals clean and ensure all electrical connections are tight. Periodically check the alternator and starter motor for wear. If the loader struggles to start, it could be a sign of an electrical issue that requires attention.
5. Grease Moving Parts
Lubricating the moving parts of the loader, such as the boom pivots, bucket linkage, and undercarriage components, helps prevent premature wear. Make it a habit to grease these parts at least once a day or according to the maintenance schedule.
Conclusion
The Bobcat 843 skid steer loader is a reliable machine that can handle a wide variety of tasks. While it is known for its rugged design and versatility, like any older piece of machinery, it requires regular maintenance to keep it in top working condition. Hydraulic system issues, electrical failures, and engine starting problems are some of the common concerns with this model, but with proactive care and routine inspections, these issues can be mitigated.
By following the recommended maintenance practices and addressing minor problems before they become major repairs, you can ensure that your Bobcat 843 continues to deliver excellent performance on the job site for years to come.