Case 850E, 855E Crawler Dozer Repair Manual

The Case 850E and 855E crawler loader-dozers were designed to deliver dependable performance for construction, earthmoving, and utility applications. Built during the 1990s, these models combine Case’s proven diesel engines, durable powertrains, and efficient hydraulics to handle tough grading, dozing, and loader operations. With robust undercarriages and operator-focused layouts, both machines are engineered for reliability and long service life.

General
The Case 850E weighs approximately 18,460 lb, while the 855E is slightly heavier at about 20,858 lb. Both are built on rugged crawler frames to provide stability, balance, and traction in demanding work conditions. Their designs combine the versatility of a loader with the pushing ability of a dozer.

Engine
The Case 850E is powered by a Case 6T-590, 6-cylinder diesel engine with 359 cu in displacement, rated at 99 gross horsepower (89 net). The Case 855E uses a similar Case 6-cylinder diesel rated at 89 net horsepower, optimized for loader-dozer operations. Both engines provide strong torque, fuel efficiency, and durability.

Fuel System
The 850E features a 47-gallon fuel tank, while the 855E employs a similar system sized for extended shifts. These systems are designed for steady fuel delivery under sustained load, supporting long hours in earthmoving applications.

Electrical
The 850E is equipped with a 24-volt electrical system and 45-amp alternator, supporting reliable starting, lighting, and auxiliary functions. The 855E uses a comparable electrical configuration suitable for industrial operation.

Track
Crawler undercarriages with wide shoes provide excellent traction and flotation. Both models are built to handle rough terrain and maintain ground stability under load, ensuring efficient dozing and loader operations.

Power Train
The Case 850E uses a 4-speed transmission with four forward and reverse speeds, paired with torque converter drive for smooth power transfer. The 855E incorporates a power-shift transmission, simplifying gear changes and improving productivity in repetitive loader cycles.

Brakes
Both machines use heavy-duty braking systems designed for reliable stopping power and safety, even under continuous operation. Wet-disc or sealed components reduce maintenance needs and extend service life.

Hydraulics
The 850E features an open-center hydraulic system delivering 24 GPM at 2,200 psi, enabling smooth blade and loader operation. The 855E supports loader functionality with a system designed to power its 1.5 yd³ bucket capacity. These hydraulic systems ensure responsive and reliable control of mounted equipment.

Mounted Equipment
The Case 850E typically works with straight or six-way PAT blades, while the 855E is optimized for loader duties with bucket capacities up to 1.5 yd³. Both machines can be configured with rear-mounted allied equipment such as rippers or winches, expanding their versatility on the job site.

Key Highlights

• 850E: 99 gross HP / 89 net HP, 6-cylinder diesel, ~18,460 lb operating weight
• 855E: 89 net HP, 6-cylinder diesel, ~20,858 lb operating weight
• Transmission: 850E with 4-speed torque converter drive; 855E with power-shift tran