Case 2550 Crawler Dozer Repair Manual

The Case 2550 crawler dozer, produced in the late 1970s through the mid-1980s, was the largest and most powerful crawler in Case’s lineup of that era. Built for mining, large-scale earthmoving, and land-clearing projects, the 2550 combined massive horsepower, heavy operating weight, and robust engineering to compete directly with other heavy crawler tractors of its generation. With an operating weight of nearly 88,000 lb and a blade capacity exceeding 10 cubic yards, it was designed for maximum productivity in the toughest conditions.

General
The Case 2550 was a large-frame crawler dozer weighing approximately 88,000 lb. With wide track options and heavy-duty undercarriage components, it provided stability, traction, and balance for demanding earthmoving applications.

Engine
Power was provided by a 6-cylinder turbocharged diesel engine with 14.7 L (898 cu in) displacement. Rated at about 285 gross horsepower (260 net), the engine delivered nearly 890 lb-ft of torque at 1,400 rpm, giving the machine exceptional dozing strength and reliability under heavy load.

Power Train
The Case 2550 featured a 3-speed full power-shift transmission with three forward and three reverse speeds. Forward travel speeds reached approximately 6.5 mph, with reverse up to 7.5 mph. Heavy-duty planetary final drives ensured durability and consistent power transfer to the ground.

Brakes
Hydraulic wet-disc brakes provided dependable stopping power with minimal maintenance requirements, complemented by a parking brake for added safety.

Hydraulic System
The 2550 used a high-capacity hydraulic system with a 40-gallon reservoir and open-center design. The system powered the large dozer blade and auxiliary attachments with responsive control, even under continuous duty cycles.

Undercarriage
The undercarriage was built for extreme conditions, featuring 8 bottom rollers and 2 carrier rollers per side, with track shoe widths ranging from 24 to 30 inches. Ground pressure averaged about 10 psi, with wider shoes available for soft soils.

Blade and Attachments
The Case 2550 supported a variety of blades, including straight, semi-U, and full U types, with capacities ranging from 10 to 12 cubic yards heaped. Rear attachments such as rippers and winches expanded its utility in mining and land-clearing operations.

Electrical System
The 2550 used a 24-volt electrical system with dual 12-volt batteries and an alternator to power starting, lighting, and auxiliary systems.

Cab and Operator Comfort
The operator’s station was available with ROPS canopy or enclosed cab, with optional heater and air conditioning. Controls were simple yet durable, designed for long working shifts in rugged environments.

Key Highlights

• Production years: Late 1970s – mid 1980s
• Engine: 6-cyl turbocharged diesel, 14.7 L (898 cu in), ~285 HP gross / 260 HP net
• Max torque: ~890 lb-ft @ 1,400 rpm
• Operating weight: ~88,000 lb
• Transmission: 3-speed full power-shift, 3F / 3R; max travel ~6.5 mph forward, 7.5 mph reverse
• Blade capacity: 10 – 12 yd³ (straight, semi-U, U options)
• Track system: 8 bottom rollers, 2 carrier rollers; 24–30 in shoes
• Ground pressure: ~10 psi (varies with shoe width)
• Hydraulic system: ~40-gal reservoir; high-capacity open-center design
• Fuel capacity: 150 gal; Cooling system: 25 gal; Engine oil: 8 gal
• Electrical: 24V system, dual 12V batteries, alternator equipped
• Cab: ROPS canopy or enclosed cab, optional HVAC