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Addressing Brake Issues on the Case 850C Dozer
#1
The Case 850C dozer is a reliable and powerful piece of heavy machinery, widely used in construction, grading, and land clearing projects. As with any complex piece of equipment, issues with its components are inevitable over time. One common problem faced by operators of the 850C dozer is brake issues, which can be frustrating and compromise both safety and performance.
In this article, we’ll dive deep into the potential causes of brake problems in the Case 850C dozer, and offer a comprehensive guide to troubleshooting and resolving these issues.
Overview of the Case 850C Dozer
The Case 850C is a mid-sized crawler dozer, known for its robust engine performance and versatility in a variety of heavy-duty applications. This dozer, manufactured by Case Construction Equipment, was a part of the 850 series, which has been well-regarded for its reliability and serviceability in the field. The 850C was equipped with a diesel engine and hydraulic system, which powers the hydraulic brakes for smooth operation.
Despite its overall durability, dozers like the Case 850C are subjected to heavy workloads, and brake issues can arise from a number of factors. Whether it’s soft brakes, lack of braking power, or complete brake failure, identifying the underlying problem requires a methodical approach.
Common Brake Issues on the Case 850C Dozer
Operators often report several different types of brake issues with the Case 850C dozer. These include:
1. Soft or Spongy Brakes
Soft brakes, where the brake pedal feels “spongy” or has excessive travel, are a common issue. This can lead to reduced braking power and can be a sign of an underlying problem in the hydraulic braking system.
  • Possible Causes:
    • Air trapped in the hydraulic brake lines.
    • Low hydraulic fluid levels or contaminated fluid.
    • Leaks in the hydraulic lines or seals.
    • Worn-out brake pads or discs.
2. Lack of Braking Power
In some cases, the brakes may not provide enough stopping force, even when the pedal is fully depressed. This can be dangerous, especially when the dozer is working on slopes or during critical operations.
  • Possible Causes:
    • Malfunctioning brake valves.
    • Worn-out or damaged brake components such as pads, rotors, or calipers.
    • Air in the hydraulic system.
    • Low fluid pressure or hydraulic system failure.
3. Brake Fade
Brake fade occurs when the brakes gradually lose their effectiveness after continuous use, often due to heat buildup. In a dozer, this can occur when heavy pushing or grading is done without adequate time for the brakes to cool.
  • Possible Causes:
    • Overheating of the brake system.
    • Contaminated brake fluid.
    • Worn brake pads or linings.
    • Insufficient cooling in the hydraulic brake system.
4. Complete Brake Failure
Complete brake failure, where the brakes are unable to engage at all, is a serious issue that requires immediate attention. This problem can make the dozer uncontrollable and pose a significant safety risk.
  • Possible Causes:
    • Total hydraulic failure.
    • Broken or disconnected hydraulic lines.
    • Complete wear-out of the brake discs or pads.
    • Hydraulic pump failure.
Troubleshooting the Brake System
To resolve brake issues on the Case 850C dozer, it’s important to methodically troubleshoot the hydraulic brake system. Here’s a step-by-step approach:
1. Check the Hydraulic Fluid
Low or contaminated hydraulic fluid can significantly impact the performance of the braking system. Inspect the hydraulic fluid reservoir and ensure that the fluid levels are within the manufacturer’s recommended range.
  • Solution: If the fluid is low, refill it using the correct type of fluid specified for the 850C. If the fluid appears dirty or contaminated, perform a full fluid change and flush the system to remove any debris.
2. Inspect for Leaks
Hydraulic leaks can lead to reduced pressure in the brake system, resulting in soft or ineffective braking. Check all hydraulic lines, hoses, and seals for any signs of leakage or damage.
  • Solution: If leaks are found, replace the damaged hoses, seals, or fittings. Ensure that the hydraulic lines are properly tightened and free of any cracks or wear.
3. Bleed the Brake System
Air in the hydraulic lines can cause soft or spongy brakes. Bleeding the brake system helps remove any trapped air from the lines, restoring full hydraulic pressure.
  • Solution: Follow the manufacturer’s instructions to properly bleed the hydraulic brake system. This process typically involves using a brake bleeder kit and pumping the brake pedal to release air bubbles from the lines.
4. Inspect Brake Pads and Discs
Worn-out brake pads or discs can severely limit the braking performance of the dozer. Check the thickness of the brake pads and inspect the brake discs for any signs of excessive wear or damage.
  • Solution: If the brake pads or discs are worn beyond the manufacturer’s specifications, replace them. Be sure to use OEM (original equipment manufacturer) parts for optimal performance.
5. Test the Brake Valves
The brake valves control the flow of hydraulic fluid to the brake components. Malfunctioning valves can cause inadequate brake response or uneven braking.
  • Solution: If you suspect issues with the brake valves, they should be tested for proper operation. Replace any faulty valves to restore proper braking function.
6. Inspect the Hydraulic Pump
The hydraulic pump is responsible for supplying pressure to the brake system. If the pump fails or is not providing enough pressure, the brakes may not function properly.
  • Solution: Check the hydraulic pump for proper pressure output. If the pump is not operating as expected, it may need to be repaired or replaced.
Preventive Maintenance for the Brake System
Maintaining the brake system on the Case 850C dozer is key to preventing issues and ensuring long-term performance. Here are a few preventive measures to keep the braking system in top condition:
  • Regularly check hydraulic fluid levels and quality to ensure they remain within the recommended range.
  • Inspect the brake pads and discs for wear and replace them before they reach critical wear levels.
  • Keep the hydraulic lines clean and free of leaks, ensuring that all connections are tight and secure.
  • Bleed the brake system periodically, especially after any major hydraulic maintenance or fluid changes, to ensure there is no air in the lines.
  • Test the brake system regularly to confirm that all components are functioning properly.
Conclusion
Brake issues on the Case 850C dozer are a common challenge, but with the right troubleshooting techniques and regular maintenance, operators can ensure their dozers remain in good working order. Whether the problem is soft brakes, lack of braking power, or complete failure, addressing the root cause of the issue is essential for safety and performance. Regular inspections, proper fluid maintenance, and timely component replacements will go a long way in extending the life of the dozer’s brake system and preventing costly repairs.
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