Troubleshooting the Parking Brake Issue on the Case 855E

[MikePhua]

The Case 855E is a rugged, reliable machine commonly used in construction, landscaping, and earth-moving operations. Known for its powerful engine and versatile design, the 855E is a popular choice for operators who require a heavy-duty piece of equipment that can handle tough tasks. However, like any piece of heavy machinery, it can encounter operational issues, and one such issue that some users have faced is the failure to release the parking brake, preventing the machine from starting. This article explores the common causes of this problem, how to troubleshoot it, and how to prevent it from happening in the future.
Overview of the Case 855E
The Case 855E is a compact dozer designed for a variety of earth-moving applications. It features a 4-cylinder engine and is known for its ability to navigate tight spaces, making it ideal for tasks like grading, clearing, and excavation. Despite its relatively small size compared to larger bulldozers, the 855E offers impressive power and maneuverability.
Key specifications include:

• Engine Power: 85 horsepower
  
• Operating Weight: 15,000 lbs (6,800 kg)
  
• Blade Width: 7 feet (2.13 meters)
  
• Hydraulic System: 20 GPM (gallons per minute) flow rate
  
• Transmission: 4-speed, power-shift
  

One of the critical features of the 855E is its parking brake system, which is essential for ensuring the machine remains stationary when not in use, especially on slopes or uneven terrain. However, issues with the parking brake system can prevent the machine from starting, and addressing these problems promptly is essential for maintaining productivity.
Common Causes of Parking Brake Issues
The parking brake issue that prevents the Case 855E from starting is typically related to the system’s failure to release properly. This can happen for several reasons, all of which stem from mechanical or hydraulic failures. Below are some of the most common causes:
1. Faulty Parking Brake Lever or Switch
The parking brake lever or switch is responsible for engaging and releasing the parking brake. If the lever or switch becomes faulty or worn, it may not disengage the brake, causing the machine to remain locked in place.

• Possible Causes: A malfunctioning switch, a misadjusted lever, or broken internal components in the parking brake mechanism.
  
• Troubleshooting: Inspect the parking brake lever or switch for any signs of wear or malfunction. Test the lever to ensure it is engaging and disengaging properly. If the switch or lever feels loose, replace it to restore normal operation.
  

2. Hydraulic or Pneumatic Failures
In some versions of the 855E, the parking brake system operates using hydraulic or pneumatic pressure. If there is a failure in the hydraulic system, such as a loss of pressure or a blockage, the brake may not disengage properly.

• Possible Causes: Low hydraulic fluid, air in the hydraulic lines, a failed pump, or a blocked hydraulic valve.
  
• Troubleshooting: Check the hydraulic fluid levels and top up if necessary. Inspect hydraulic hoses and connections for leaks or blockages. Bleed the hydraulic lines to remove any air and ensure proper fluid flow. If the hydraulic pump appears damaged or malfunctioning, consider replacing it.
  

3. Electrical System Issues
The parking brake on the Case 855E may also be connected to the electrical system, especially if it has an electronic release mechanism. Electrical faults or blown fuses can cause the brake to remain engaged.

• Possible Causes: Blown fuses, faulty relays, or damaged wiring connections.
  
• Troubleshooting: Inspect the fuses and relays related to the parking brake system. Replace any blown fuses and ensure the electrical connections are secure. If the electrical wiring appears damaged, repair or replace the affected parts.
  

4. Mechanical Issues in the Brake Assembly
Over time, the mechanical components of the parking brake assembly, such as the brake pads, cables, and actuators, can wear out or become damaged. If these parts are worn, the brake may not disengage properly.

• Possible Causes: Worn brake pads, corroded cables, or damaged actuators.
  
• Troubleshooting: Inspect the mechanical components of the parking brake system. Look for worn-out brake pads, frayed cables, or corroded parts. Replace any worn components to ensure smooth operation of the parking brake.
  

Steps to Release the Parking Brake
If you find yourself in a situation where the parking brake will not release on the Case 855E, follow these steps to troubleshoot and potentially resolve the issue:

1. Check the Parking Brake Lever: Ensure the parking brake lever is fully disengaged. If it seems loose or stuck, it could be a sign of a faulty lever or switch.
   
2. Inspect the Hydraulic System: If your machine uses hydraulics to release the parking brake, check the hydraulic fluid level and ensure there is no air in the system. Bleeding the hydraulic system can help release any trapped air.
   
3. Verify Electrical Connections: Inspect the electrical components, such as fuses, relays, and wiring. If any of these parts are malfunctioning, replace them to restore normal function.
   
4. Examine the Brake Assembly: If the brake pads, cables, or actuators are worn or damaged, replace them. This may require disassembling the brake system to access and inspect the components.
   
5. Consult the Operator’s Manual: Refer to the operator's manual for detailed instructions on how to troubleshoot and repair the parking brake system. The manual may offer additional troubleshooting steps specific to the Case 855E.
   

Preventing Future Parking Brake Issues
Preventative maintenance is key to avoiding issues with the parking brake system in the future. Regular inspections and proper care of the hydraulic, electrical, and mechanical components will ensure that the parking brake operates efficiently when needed.
1. Regularly Check Hydraulic Fluid Levels
Ensure that the hydraulic fluid is at the proper level and replace it as needed. Low fluid levels can lead to poor brake performance and other hydraulic issues.
2. Inspect Brake Components Periodically
Regularly inspect the brake pads, cables, and actuators for signs of wear. Replacing these parts before they fail can prevent unexpected downtime.
3. Test the Electrical System
Check the electrical components, such as fuses, relays, and wiring, regularly to ensure they are functioning properly. Preventing electrical failures can help avoid issues with the parking brake release mechanism.
4. Lubricate Moving Parts
Ensure that all moving parts related to the parking brake, such as cables and levers, are properly lubricated. This will prevent wear and ensure smooth operation over time.
Conclusion
Parking brake issues on the Case 855E can be frustrating, but they are often easy to troubleshoot with the right approach. By understanding the common causes of these issues and performing regular maintenance on the hydraulic, electrical, and mechanical components, operators can prevent most parking brake failures. Whether the issue lies with a faulty lever, hydraulic system failure, or mechanical wear, addressing it promptly will keep the machine running efficiently and avoid unnecessary downtime. With proper care and regular checks, the Case 855E will continue to serve its purpose effectively in the field.