Adjusting Steering and Brakes on a Deere 550G: A Complete Guide

[MikePhua]

The John Deere 550G is a well-regarded dozer, part of Deere’s G-series, known for its reliable performance in construction, earthmoving, and grading tasks. Like any piece of heavy machinery, the 550G requires regular maintenance to ensure optimal performance. One of the most important components that need attention is the steering and brake system. Adjusting the steering and brake mechanisms properly ensures smooth operation, safety, and longevity of the machine. This guide will walk through the steps of adjusting the steering and brake system on a Deere 550G dozer, including common issues, tips, and best practices.
Understanding the Steering and Brake System
The steering and braking systems on the Deere 550G are essential for controlling the machine's movement. The 550G uses a hydrostatic steering system that relies on hydraulic power to maneuver the dozer. The brakes, typically multi-disc wet brakes, are designed to provide stopping power under heavy loads and harsh operating conditions. Ensuring that both the steering and brake systems are properly adjusted is vital for the safety and efficiency of the machine.
Common Issues with Steering and Brakes on the Deere 550G
Before diving into the adjustments, it’s important to recognize the common problems operators face with the steering and brake systems on the Deere 550G:

1. Poor Steering Response: The machine may show delayed or inconsistent steering responses. This can be due to air in the hydraulic lines, low hydraulic fluid levels, or a malfunction in the steering control valve.
   
2. Uneven or Weak Braking: If one side of the dozer is braking harder than the other, or if the machine takes longer to stop than usual, the brake system might need to be adjusted. This could be due to issues like worn brake components, uneven brake fluid distribution, or incorrect linkage settings.
   
3. Leaking Fluid: Hydraulic fluid leaks can cause steering issues, as well as interfere with the brake system, reducing performance.
   
4. Erratic Brake Performance: Inconsistent brake application or dragging brakes can be caused by the lack of proper brake fluid pressure, worn-out brake pads, or debris in the brake lines.
   

Understanding these potential issues can help diagnose the exact problem before making adjustments.
Steps to Adjust the Steering on the Deere 550G
To maintain smooth steering on the Deere 550G, adjustments need to be made to ensure the hydraulic system is operating efficiently. Below are the steps to properly adjust the steering system:
1. Check Hydraulic Fluid Levels
Hydraulic fluid plays a critical role in the operation of the steering system. Low fluid levels can result in poor steering response.

• Step 1: Park the machine on a level surface.
  
• Step 2: Turn off the engine and allow it to cool.
  
• Step 3: Locate the hydraulic fluid reservoir. It is typically found near the operator’s platform.
  
• Step 4: Check the fluid level using the dipstick and refill the fluid as necessary. Use the manufacturer’s recommended hydraulic oil.
  

2. Bleed the Hydraulic System
Air in the hydraulic lines can cause erratic steering performance. To remove any air, you will need to bleed the system:

• Step 1: With the machine turned off, locate the hydraulic steering control valve.
  
• Step 2: Loosen the bleeder screws on the valve to allow air to escape.
  
• Step 3: Start the engine and move the steering wheel from side to side, ensuring the hydraulic fluid circulates through the system.
  
• Step 4: Tighten the bleeder screws once the air has been purged.
  

3. Adjust the Steering Linkage
If the steering feels off-center or there’s too much play, the steering linkage may need to be adjusted:

• Step 1: Locate the steering linkage and check for any loose or worn components.
  
• Step 2: If any parts are worn or damaged, they should be replaced.
  
• Step 3: Adjust the linkage according to the manufacturer’s specifications to reduce any play or resistance in the steering.
  

4. Inspect and Adjust the Steering Valve
The steering control valve helps to regulate hydraulic flow. If the valve is malfunctioning, it may need to be adjusted or replaced.

• Step 1: Identify the location of the steering control valve. It is usually near the steering wheel or steering pump.
  
• Step 2: Inspect the valve for any visible wear or damage.
  
• Step 3: Adjust the valve to ensure proper flow to the hydraulic steering system. If necessary, replace the valve or seals to eliminate leaks.
  

Steps to Adjust the Brakes on the Deere 550G
Proper brake adjustment is crucial for safe operation, especially when the dozer is under load. The following steps outline the process to adjust the brakes on a Deere 550G:
1. Inspect Brake Fluid Levels
Like the steering system, the brake system relies on hydraulic fluid to function. Low fluid can lead to weak or uneven braking.

• Step 1: Check the brake fluid reservoir and make sure the fluid is at the correct level.
  
• Step 2: Refill the fluid if necessary, using the recommended brake fluid type.
  

2. Check Brake Pads and Shoes
Worn-out brake pads or shoes can cause poor braking performance. These components need to be inspected and replaced if necessary.

• Step 1: Remove the wheel covers and inspect the brake pads for excessive wear.
  
• Step 2: If the pads are worn down beyond the recommended limit, replace them with new ones.
  
• Step 3: Check the brake discs or drums for cracks or warping and replace them if needed.
  

3. Adjust Brake Linkage
If the brake system is not applying enough pressure or is dragging, adjusting the brake linkage can often resolve the issue.

• Step 1: Locate the brake linkage near the brake pedal or levers.
  
• Step 2: Check for any slack or misalignment in the linkage.
  
• Step 3: Adjust the linkage to ensure a proper fit, making sure the brake pads engage evenly.
  

4. Adjust Brake Pedal Travel
The brake pedal travel should be smooth and consistent. If the pedal feels soft or has excessive travel, it may need to be adjusted.

• Step 1: Locate the brake pedal adjustment mechanism.
  
• Step 2: Adjust the pedal’s free play by tightening or loosening the adjustment bolt.
  
• Step 3: Test the pedal to ensure it provides proper response when depressed.
  

5. Bleed the Brake System
Just like the steering system, air trapped in the brake lines can cause inconsistent braking. Bleeding the brakes ensures optimal performance.

• Step 1: Attach a hose to the brake bleeder valve on each wheel.
  
• Step 2: Open the valve and pump the brake pedal to force air out of the lines.
  
• Step 3: Close the valve and repeat the process on each wheel until no air bubbles are seen.
  

Testing and Final Checks
After adjusting both the steering and brake systems, it is important to perform a series of tests to ensure everything is functioning as expected.
1. Test the Steering

• Start the engine and test the steering by moving the dozer in a controlled environment.
  
• Check for smooth and responsive turns.
  
• Ensure that the steering wheel returns to the center position when released.
  

2. Test the Brakes

• Test the brakes by driving the dozer in a controlled area.
  
• Check for consistent braking power across all wheels.
  
• Ensure the brake pedal engages properly and the dozer stops within a safe distance.
  

Conclusion
Maintaining the steering and brake systems of the Deere 550G dozer is critical for ensuring safe and efficient operation. By regularly checking hydraulic fluid levels, inspecting components for wear, and making necessary adjustments to the steering and brake systems, operators can prolong the life of the machine and reduce the risk of malfunctions. Proper adjustments also improve the overall performance and handling of the dozer, making it a more reliable tool for heavy-duty tasks. Regular servicing and troubleshooting are key to keeping the Deere 550G in top condition for the long haul.