Adjusting Steering Clutches and Brakes on the Case 850H WT Dozer

[MikePhua]

The Case 850H WT and Its Role in Mid-Size Earthmoving
The Case 850H WT (Wide Track) dozer was introduced in the early 2000s as part of Case’s H-series lineup, designed for grading, site prep, and light clearing. With an operating weight around 20,000 pounds and a 90 hp turbocharged diesel engine, the 850H WT offered a balance of power and maneuverability. Its wide track configuration provided lower ground pressure, making it ideal for soft terrain and slope work.
Case Construction Equipment, a legacy brand dating back to 1842, built the 850H series to compete with mid-size dozers from John Deere and Komatsu. The machine’s hydrostatic drive, modular components, and straightforward mechanical systems made it popular among contractors and municipalities alike.
Terminology Clarification

• Steering Clutch: A friction-based mechanism that disengages power to one track, allowing the machine to turn.
  
• Brake Band: A curved friction surface that clamps onto a drum to stop track movement.
  
• Adjustment Bolt: A threaded rod used to set clutch engagement or brake tension.
  
• Access Cover: A removable panel that allows entry to internal components for service.
  
• Free Play: The amount of lever movement before the clutch or brake begins to engage.
  

Symptoms of Misadjusted Steering and Braking
Operators may notice the following issues when clutch or brake settings drift out of spec:

• Uneven turning radius or delayed response
  
• Excessive lever travel before engagement
  
• Brake drag or overheating
  
• Inability to hold position on slopes
  
• Jerky or inconsistent steering under load
  

In one case from northern Michigan, a forestry crew reported difficulty turning left on a slope with their 850H WT. After inspection, they found the left brake band had worn unevenly and the clutch free play exceeded spec by nearly half an inch. A full adjustment restored smooth operation and reduced fuel consumption.
Accessing the Adjustment Points
To begin the adjustment process:

• Park the machine on level ground and block the tracks
  
• Remove the floor panels and side covers to expose the clutch housings
  
• Identify the adjustment bolts for both the steering clutches and brake bands
  
• Clean the area thoroughly to prevent debris from entering the housing
  

Steering Clutch Adjustment Procedure

1. Measure Lever Free Play
   Ideal range is typically 1.25 to 1.5 inches. Use a ruler or caliper at the lever pivot.
   
2. Locate the Adjustment Bolt
   Found on the clutch linkage arm inside the housing. Loosen the locknut first.
   
3. Turn the Bolt to Adjust Engagement
   Clockwise reduces free play, counterclockwise increases it. Adjust in quarter-turn increments.
   
4. Test Lever Feel and Track Response
   Engage each clutch independently and observe track movement. Both sides should respond evenly.
   
5. Tighten Locknut and Recheck
   After final adjustment, secure the locknut and confirm lever travel under load.
   

Brake Band Adjustment Procedure

1. Inspect Brake Drum and Band Condition
   Look for scoring, glazing, or uneven wear. Replace if necessary before adjusting.
   
2. Locate Brake Adjustment Bolt
   Typically found near the rear of the clutch housing, connected to the brake linkage.
   
3. Adjust Band Tension
   Turn the bolt until the band contacts the drum firmly but does not drag when disengaged.
   
4. Test Holding Power on Incline
   With engine off, engage brake and attempt to roll machine. It should hold position without slipping.
   
5. Balance Both Sides
   Ensure left and right brakes engage with equal force and timing.
   

Preventive Maintenance and Best Practices
To maintain optimal steering and braking:

• Grease linkage points monthly
  
• Inspect clutch discs and brake bands every 500 hours
  
• Replace worn springs or bushings during annual service
  
• Keep access covers sealed to prevent moisture intrusion
  
• Train operators to avoid riding the levers during travel
  

In 2022, a contractor in Alberta implemented a quarterly adjustment schedule for their fleet of Case dozers. Over the next year, clutch failures dropped by 60%, and brake-related downtime was nearly eliminated.
Recommendations for Field Technicians
When servicing the Case 850H WT:

• Use OEM parts for clutch and brake components to ensure compatibility
  
• Document all adjustments and wear measurements
  
• Replace both sides simultaneously to maintain balance
  
• Consider upgrading to sealed bearings in high-moisture environments
  
• Keep spare linkage hardware in the service truck for emergency repairs
  

Conclusion
Proper adjustment of steering clutches and brake bands on the Case 850H WT is essential for safe, efficient operation. With regular inspection and precise tuning, operators can maintain full control even in challenging terrain. The 850H WT’s mechanical design rewards proactive maintenance, and with the right approach, it remains a dependable workhorse for grading, clearing, and slope work across diverse job sites.