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The Case 855D and Its Role in the Track Loader Market
The Case 855D was introduced in the mid-1980s as a heavy-duty track loader designed for general construction, demolition, and land clearing. It was powered by the Cummins 6-590 diesel engine, a naturally aspirated inline six-cylinder known for its durability and torque. With an operating weight of approximately 34,000 pounds and a 4-in-1 bucket option, the 855D offered versatility for contractors who needed both dozing and loading capabilities in a single machine.
Case Construction Equipment, a division of CNH Industrial, had already established a strong presence in the loader market with earlier models like the 850B. The 855D built on that legacy with improved hydraulics, better operator visibility, and a more robust undercarriage. Though production ceased in the early 1990s, many units remain in service today, particularly in rural and forestry applications.
Engine Performance and Known Strengths
The Cummins 6-590 engine is widely regarded as nearly indestructible when maintained properly. It delivers around 125 horsepower and is known for its mechanical simplicity. Unlike turbocharged engines, the naturally aspirated 6-590 avoids heat stress and complex boost systems, making it easier to service in the field.
Operators report that these engines often exceed 10,000 hours with only routine maintenance. However, oil pan corrosion is a known issue, especially if belly pans are not regularly cleaned. Accumulated debris and moisture can lead to rust-through, causing oil leaks and potential engine damage.
Transmission and Final Drive Inspection Tips
The 855D uses a powershift transmission that should be tested both cold and hot. Key inspection points include:
Hydraulic System and Loader Valve Wear
The loader control valve, particularly the spool surfaces, can develop leaks over time. If the chrome plating on the spools is worn through, repairs can be expensive. At 11,000 hours, this is a likely concern. Leaks at the valve body may also indicate internal wear or contamination.
Hydraulic performance should be tested under load, checking for:
The 855D uses a dual-control system where steering can be achieved via shift levers or brake pedals. Best practice is to use the shift levers for directional changes and reserve the brakes for stopping only. Overuse of the brakes for steering can lead to premature wear and overheating.
Ask the previous owner about their operating habits. Machines that were steered primarily with brakes may have worn bands or warped drums.
Conclusion
The Case 855D remains a respected machine in the track loader category, especially when equipped with the 4-in-1 bucket. Its Cummins 6-590 engine is a standout for reliability, and the overall build quality supports long service life. However, at 11,000 hours, buyers should conduct a thorough inspection focusing on transmission behavior, final drive integrity, and hydraulic valve condition. With proper care, the 855D can continue to serve as a dependable workhorse in demanding environments.
The Case 855D was introduced in the mid-1980s as a heavy-duty track loader designed for general construction, demolition, and land clearing. It was powered by the Cummins 6-590 diesel engine, a naturally aspirated inline six-cylinder known for its durability and torque. With an operating weight of approximately 34,000 pounds and a 4-in-1 bucket option, the 855D offered versatility for contractors who needed both dozing and loading capabilities in a single machine.
Case Construction Equipment, a division of CNH Industrial, had already established a strong presence in the loader market with earlier models like the 850B. The 855D built on that legacy with improved hydraulics, better operator visibility, and a more robust undercarriage. Though production ceased in the early 1990s, many units remain in service today, particularly in rural and forestry applications.
Engine Performance and Known Strengths
The Cummins 6-590 engine is widely regarded as nearly indestructible when maintained properly. It delivers around 125 horsepower and is known for its mechanical simplicity. Unlike turbocharged engines, the naturally aspirated 6-590 avoids heat stress and complex boost systems, making it easier to service in the field.
Operators report that these engines often exceed 10,000 hours with only routine maintenance. However, oil pan corrosion is a known issue, especially if belly pans are not regularly cleaned. Accumulated debris and moisture can lead to rust-through, causing oil leaks and potential engine damage.
Transmission and Final Drive Inspection Tips
The 855D uses a powershift transmission that should be tested both cold and hot. Key inspection points include:
- Shift timing: Transitions between gears should be smooth and consistent
- Pressure checks: Measure transmission pressure at idle during range shifts to detect internal wear
- Mounting bolts: Access holes in the chassis allow inspection of transmission and final drive mounting bolts—ensure none are missing or loose
- Final drive housings: Check for thinning or cracking, especially on high-hour machines
Hydraulic System and Loader Valve Wear
The loader control valve, particularly the spool surfaces, can develop leaks over time. If the chrome plating on the spools is worn through, repairs can be expensive. At 11,000 hours, this is a likely concern. Leaks at the valve body may also indicate internal wear or contamination.
Hydraulic performance should be tested under load, checking for:
- Smooth bucket and boom operation
- No hesitation or surging
- Consistent pressure across all functions
The 855D uses a dual-control system where steering can be achieved via shift levers or brake pedals. Best practice is to use the shift levers for directional changes and reserve the brakes for stopping only. Overuse of the brakes for steering can lead to premature wear and overheating.
Ask the previous owner about their operating habits. Machines that were steered primarily with brakes may have worn bands or warped drums.
Conclusion
The Case 855D remains a respected machine in the track loader category, especially when equipped with the 4-in-1 bucket. Its Cummins 6-590 engine is a standout for reliability, and the overall build quality supports long service life. However, at 11,000 hours, buyers should conduct a thorough inspection focusing on transmission behavior, final drive integrity, and hydraulic valve condition. With proper care, the 855D can continue to serve as a dependable workhorse in demanding environments.
