Model Spotlight

Case 850H Crawler Dozer: Specs, Parts & Common Issues

Produced 2000 - 2003, the Case 850H is the H-generation mid-large frame Case crawler dozer - Cummins 6BT-derived turbocharged six-cylinder diesel and hydrostatic dual-path transmission. The H-generation introduced hydrostatic drivetrain to the 850 line for the first time, simultaneously with the 550H, 650H, and 750H across Case's mid-class dozer range. Three primary variants: Standard, LT (Long-Track), and LGP (Low Ground Pressure).

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Broken Tractor Editorial Team• Updated May 2026• 10 min read

The Case 850H Crawler Dozer is the H-generation mid-large frame Case crawler dozer, produced from 2000 through 2003. The H-generation marked the most significant drivetrain change in the modern 850 line: hydrostatic dual-path transmission replaced the power shift used on the 850D, 850E, and 850G. Each track is now driven by its own variable-displacement hydraulic pump and motor - direction and speed are controlled by joystick rather than gear shifting. The same hydrostatic shift happened simultaneously on the 550H, 650H, and 750H, defining the H-generation across all mid-class Case dozers.

The 850H runs the Cummins 6BT-derived inline six-cylinder turbocharged diesel - the same engine family lineage as the 850G predecessor (Case 6-590 / 6T-590), now standardized in turbocharged form. The combination of the Cummins 6BT-T with hydrostatic drivetrain gives the 850H smooth, infinitely-variable speed control and crisp direction changes well suited to grading, site work, and detail dozing.

At-a-glance specifications

How the 850H differs from the 850G predecessor

• Hydrostatic dual-path transmission - replaces power shift on the 850G. Each track has its own hydraulic motor and variable-displacement pump. Operator controls direction and speed via joystick.
• Cummins 6BT-T turbocharged engine standardized - turbo six-cylinder Cummins 6BT-derived engine standard across the H-generation. Higher power output than the 850G base configuration.
• Refreshed cab and electronics - H-generation cab is more refined with improved HVAC, electronic gauge cluster, better sightlines to the blade corners.
• Updated undercarriage - H-generation track frame and components, with broader cross-fit options to the 650H, 750H, and 850K successors on certain components.
• Variant flexibility: Standard, LT, LGP - the H generation formalized track configuration options for site-specific applications.

Variants: Standard, LT, LGP

The 850H shipped in three primary configurations:

• Standard - standard-width track, balanced general dozing.
• LT (Long Track) - extended-length track frame for additional ground contact area and stability.
• LGP (Low Ground Pressure) - wider grouser pads with extended track frame for soft-ground / wetlands / agricultural-soil work.

Variant affects undercarriage and frame parts - confirm Standard vs. LT vs. LGP by serial before ordering track pads, idlers, and frame components.

Cummins 6BT-derived turbocharged engine

The 850H engine is the turbocharged variant of the Cummins 6BT industrial family - same 5.9-liter inline six-cylinder architecture as the late-production 850D, 850E, and 850G (Case 6-590), now standardized with turbocharging for higher output. The Cummins 6BT family is one of the most widely produced industrial / commercial diesel engines in history, used across Case construction equipment, Cummins industrial applications, medium-duty trucks (Dodge Ram), and agricultural machinery.

The 6BT-T parts ecosystem is enormous - filters, injectors, water pumps, turbochargers, gaskets, and complete rebuild components are widely available through both Case dealer and aftermarket Cummins channels. Browse the Case Dozer Parts hub for current 850H engine service kits.

Hydrostatic dual-path transmission

The hydrostatic dual-path transmission is the defining technical change on the H generation. Each track has its own dedicated hydraulic drive motor. Flow to each motor is controlled by a variable-displacement hydraulic pump. The operator controls direction, speed, and turning radius through joystick inputs.

Hydrostatic drivetrain advantages: infinitely-variable speed (no discrete gears), instantaneous direction changes without clutch, fine-control responsiveness for grading and detail work, and dynamic braking from the hydraulic system itself.

Hydrostatic service items: charge pumps, charge filters, hydraulic motor seals, drive pump bearings, control valve degradation, and contamination from internal wear. Hydraulic oil quality is critical - hydrostatic systems are intolerant of contamination. Hydrostatic diagnosis typically requires dealer service tools for pressure testing.

Blade-carrier hardware cross-fit

The 850H shares several blade-carrier wear items with the 550H, 650G, 650H, 750H, and 850G mid-class Case dozers. The 117835A1 slider block is documented as cross-fitting the 850H (along with 550H, 650G, 650H, 750H, 850G) - broad mid-class Case dozer cross-fit. The matching 117836A1 wear plate has the same cross-fit.

Blade-carrier wear is a routine 850H service item - the slider block and wear plate are sacrificial wear components designed to wear before the underlying blade-carrier frame, and the broad cross-fit makes sourcing straightforward.

Operator station and seat

The 359121A1 Case / New Holland dozer suspension seat with headrest is the documented suspension seat across the H/K/L Case dozer family - broad operator-station cross-fit covering 550H, 650H, 650K, 650L, 750K, 750L, 850H, 850K, and 850L. Single SKU covering nine machines makes this one of the most useful cross-fit parts in the Case mid-class dozer line.

Common 850H service issues

Hydrostatic transmission service

Charge pump wear, control valve degradation, hydraulic motor seal failure, contamination of hydraulic oil from internal wear are routine. Hydrostatic systems require clean oil - filter change intervals matter. Hydrostatic diagnosis usually requires dealer service tools for pressure testing.

Cummins 6BT-T turbocharger wear

The turbocharger is a routine wear item on 20-plus-year-old engines. Symptoms: blue smoke at startup or under load, oil consumption climbing, audible whine outside the normal range, or visible shaft play.

Blade carrier wear plate replacement

The 117835A1 slider block and 117836A1 wear plate are routine blade-carrier service items with broad mid-class cross-fit.

Blade cylinder seal failure

Blade cylinder seal weep is normal at production-run age. Seal kit rebuilds address most cases.

Cutting edge wear

Cutting edge replacement is the most frequent blade-related service item on an 850H in active service. End bits wear faster than the center section due to corner load concentration during dozing.

Filter service

The hydrostatic drivetrain is intolerant of contamination. Stick to the recommended hydraulic filter and oil change intervals.

Seat replacement

The 359121A1 suspension seat is the verified replacement when the original cushion or suspension fails - broad H/K/L cross-fit makes sourcing straightforward.

Parts we carry for the Case 850H

For the complete 850H parts inventory, browse the Case Dozer Parts hub.

Where the 850H sits in the Case dozer family

The 850H is the H-generation mid-large frame Case crawler dozer, sitting between the Case 750H and the larger 1150H. Its predecessor is the Case 850G (mid-1990s, power shift), and its successor is the Case 850K - which continued the hydrostatic drivetrain with refreshed cab and electronics and updated emissions.