Case 850M Crawler Dozer Repair Manual

The Case 850M crawler dozer is part of Case’s advanced M-Series lineup, designed to deliver fuel efficiency, operator comfort, and high productivity through Tier 4 Final engine technology and hydrostatic drive. With operating weights between 21,980 and 23,500 lb depending on configuration, the 850M is a versatile mid-size dozer suited for construction, site preparation, and land clearing. Its hydrostatic transmission, durable undercarriage, and ergonomically designed cab provide both power and precision for challenging work environments.

Introduction
Built for strength and efficiency, the 850M combines a turbocharged FPT 6.7 L diesel engine with hydrostatic drive for consistent power delivery and easy maneuverability. Multiple track and blade configurations, including LGP variants, allow the machine to adapt to both firm and soft terrain.

Maintenance – 00
The 850M is designed for simplified service with ground-level fueling, grouped service points, and easily accessible filters. This minimizes downtime and keeps the machine productive on the job site.

Engine – 10
Powered by a Case/FPT 6.7 L six-cylinder turbocharged diesel engine, the 850M produces 125 gross horsepower (112 net) with peak torque of ~458 lb-ft at 1,400 rpm. The engine meets Tier 4 Final standards while maintaining high torque rise and fuel efficiency under load.

Power Coupling – 19
The direct coupling between the engine and hydrostatic drive system ensures smooth power transfer and responsive tractive effort, even during demanding applications.

Hydrostatic Drive – 29
A dual-path hydrostatic transmission provides infinite variable speed control and counter-rotation, enabling precise maneuverability and balanced pushing power. Maximum travel speed reaches ~5.9 mph forward and reverse.

Brakes And Controls – 33
Dynamic hydrostatic braking is supported by hydraulic wet-disc service brakes. Electronic controls with fingertip operation and programmable settings reduce operator fatigue and enhance grading accuracy.

Hydraulic Systems – 35
The hydraulic system features a load-sensing, variable-displacement piston pump delivering approximately 24 GPM at 3,000 psi. With a reservoir capacity of 23 gallons, the system provides smooth, responsive operation for the PAT blade and auxiliary attachments.

Tracks And Track Suspension – 48
The undercarriage includes 40 shoes per side with seven bottom rollers, and shoe widths ranging from 20 to 30 inches depending on configuration (XLT, WT, or LGP). Ground pressure varies from 5.9 psi in XLT versions to as low as 4.8 psi in LGP configurations, offering excellent flotation.

Cab Climate Control – 50
The ROPS/FOPS cab is designed for visibility, noise reduction, and operator comfort. Heating and optional air conditioning provide year-round productivity, while ergonomic seat and controls enhance operator efficiency.

Electrical Systems – 55
The 24-volt electrical system, supported by dual 12-volt batteries and a 100-amp alternator, ensures reliable starts and powers auxiliary systems, lighting, and electronic diagnostics.

Lubrication System – 71
Centralized lubrication points simplify servicing. Engine oil capacity of ~4.5 gallons provides reliable lubrication under continuous heavy loads.

Dozer Blade And Arm – 86
The 850M is typically fitted with a six-way PAT blade offering a heaped capacity of about 2.2–2.3 yd³. Designed for precise grading and versatile dozing, the blade system provides strength and flexibility for a wide range of applications.

Tools – 89
Optional rear attachments include winches and multi-shank rippers, expanding the machine’s versatility for site preparation, land clearing, and utility work.

Platform, Cab, Bodywork, And Decals – 90
Durable bodywork and rugged exterior protect critical components, while Case M-Series decals and platform design emphasize reliability and modern styling.

Electrical Schematic – 48090717
Service manual includes a complete electrical schematic for diagnostics and repair of the 24V electrical system.

Hydraulic Schematic – 48090718
Service manual also provides hydraulic schematics for the dozer blade, hydrostatic system, and auxiliary hydraulic circuits.

Key Highlights

• Engine: FPT 6.7 L turbo diesel, 125 gross HP / 112 net HP, 458 lb-ft torque
• Operating weight: 21,980 – 23,500 lb
• Transmission: Hydrostatic dual-path drive, variable speed up to ~5.9 mph
• Fuel capacity: 65 gallons; Hydraulic capacity: 23 gallons
• Blade: Six-way PAT blade, ~2.2–2.3 yd³ capacity
• Track: 40 shoes per side, 20–30 in shoes, 7 rollers
• Ground pressure: 5.9 psi (XLT) to 4.8 psi (LGP)
• Electrical: 24V system with dual 12V batteries, 100A alternator
• Cab: ROPS/FOPS with HVAC options
• Optional rear tools: rippers and winches