Case 850B Crawler Dozer History and Ownership Guide

[MikePhua]

Built for the Late 1970s Earthmoving Boom
The Case 850B crawler dozer was manufactured during a pivotal period in construction equipment development. With serial number records placing certain units around 1979, the 850B represented Case’s push toward mid-size dozers that could handle grading, site prep, and light clearing without the bulk of larger machines. It followed the original 850 model and preceded the 850C, each iteration refining hydraulics, operator comfort, and undercarriage durability.
Case Construction Equipment, founded in 1842, had by the late 1970s become a global player in earthmoving machinery. The 850B was part of a broader strategy to offer versatile dozers for contractors who needed reliability without overspending on fuel or maintenance. Thousands of units were sold across North America, with strong adoption in forestry, road building, and agricultural land shaping.
Core Specifications and Performance

• Operating weight: 16,000–17,000 lbs
  
• Engine: Case 336BD diesel, rated at 75–80 hp
  
• Transmission: 3-speed powershift with torque converter
  
• Blade width: 8–10 ft, depending on configuration
  
• Track gauge: 66 inches
  
• Ground pressure: 5.5–6.2 psi, ideal for soft terrain
  

The 850B was known for its responsive blade hydraulics and stable undercarriage. Operators appreciated its ability to push through clay, sand, and loam with minimal track slippage. The torque converter allowed smooth transitions between gears, especially useful when grading slopes or working near foundations.
Serial Number and Model Identification
Serial numbers for the 850B are typically stamped on a plate near the firewall or under the dash panel. For example, a unit with serial number 7078727 would be dated to approximately 1979. This information is crucial for sourcing parts, as Case made subtle changes to hydraulic fittings, blade mounts, and electrical systems across production years.
Owners seeking manuals or parts catalogs should reference the full serial number when contacting dealers or searching online databases. Case’s legacy support system includes archived documentation for most 1970s and 1980s models.
Maintenance and Common Repairs
The 850B is mechanically straightforward, but several areas require regular attention:

• Hydraulic hoses and fittings: Replace every 1,000 hours or sooner if exposed to UV or abrasion
  
• Transmission fluid: Change every 500 hours, using Case TCH or equivalent
  
• Track tension: Adjust monthly to prevent idler wear and chain stretch
  
• Blade pivot pins: Grease weekly and inspect for ovaling
  
• Cooling system: Flush annually to prevent overheating in summer conditions
  

One operator in Pennsylvania reported that his 850B ran reliably for over 4,000 hours with only minor repairs—mostly seals, hoses, and a starter motor. He used it for clearing brush and grading gravel pads for pole barns.
Upgrade Suggestions and Operator Comfort
While the 850B lacks modern cab insulation or digital gauges, several upgrades can improve usability:

• Install LED work lights for night grading
  
• Add a suspension seat with lumbar support
  
• Retrofit a ROPS canopy if not factory-equipped
  
• Use polyurethane blade bushings for smoother tilt control
  

These modifications enhance safety and reduce fatigue, especially for operators working long shifts or in variable weather.
Conclusion
The Case 850B crawler dozer remains a respected machine in the mid-size earthmoving category. Built during the late 1970s, it offers mechanical simplicity, reliable performance, and a strong parts support network. With proper maintenance and thoughtful upgrades, the 850B continues to serve landowners, contractors, and municipalities with quiet durability and timeless utility.