Track Adjustment for Case 850B Crawler Dozer

[MikePhua]

The Case 850B Crawler Dozer, introduced in the 1980s, is a robust machine renowned for its performance in various construction and agricultural tasks. Proper track tension is crucial for optimal operation, ensuring efficient power transfer and minimizing wear on the undercarriage components.
Understanding Track Tension
Track tension refers to the tightness of the tracks around the undercarriage components, including the idlers, rollers, and sprockets. Maintaining correct tension is vital to prevent excessive wear and ensure the longevity of these components.
Adjusting Track Tension on the Case 850B

1. Locate the Track Adjuster Valve
   On the Case 850B, the track adjuster valve is situated on the yoke that holds the front idler. To access it, clear any debris or mud around the area. You should find a plug with a square head. Remove this plug to reveal a grease nipple (zerk) attached to a 3/4" fitting. This fitting serves as the valve for adjusting track tension.
   
2. Loosen the Valve to Decrease Tension
   Using a 3/4" socket, loosen the valve. This action will allow grease to escape from the cylinder, reducing the tension on the tracks. It's advisable to perform this adjustment while the machine is in motion, as the tracks may loosen more effectively when the machine is operating.
   
3. Add Grease to Increase Tension
   To tighten the tracks, pump grease into the adjuster valve. This will push the front idler forward, increasing the tension on the tracks. Monitor the tracks as you add grease to achieve the desired tension.
   
4. Check Track Slack
   After adjusting, check the track slack by measuring the vertical movement between the carrier roller and the idler. A general guideline is to have about 2 inches of slack, allowing for approximately 1 inch of sag in the track. This ensures proper tension and prevents over-tightening, which can lead to premature wear.
   

Maintenance and Troubleshooting

• Monitor for Leaks: Regularly inspect the track adjuster area for any signs of grease leaks, which may indicate worn seals or other issues.
  
• Check Hydraulic Fluid: Ensure that the hydraulic system has adequate fluid levels. Low fluid can affect the performance of the track adjuster and other hydraulic components.
  
• Inspect Undercarriage Components: Regularly check the condition of the idlers, rollers, and sprockets for wear or damage. Worn components can lead to improper track tension and reduced machine performance.
  

Conclusion
Proper track adjustment on the Case 850B Crawler Dozer is essential for maintaining optimal performance and extending the life of the undercarriage components. By following the outlined procedures and conducting regular maintenance checks, operators can ensure the machine operates efficiently and reliably.