Case 650H, 750H, 850H Crawler Dozer Repair Manual

The Case 650H, 750H, and 850H crawler dozers form part of Case’s H-Series lineup, combining reliable Case-built engines, rugged undercarriages, and advanced hydraulics. These mid-size dozers are designed to provide efficient power delivery, excellent maneuverability, and operator-focused safety for a wide range of construction, utility, and land management applications.

General
The 650H weighs between 16,091 and 17,440 lb, while the 750H LT and 850H WT weigh approximately 17,284 lb and 17,519 lb respectively. Their compact lengths of around 14 feet with ground clearance near 1 ft give them maneuverability while maintaining stability. Each model is equipped with a ROPS canopy operator station for visibility and safety.

Engines
All three models are powered by Case diesel engines. The 650H and 750H use the 4-cylinder 4T-390 engine (239 cu in), producing 80 and 90 gross horsepower respectively. The larger 850H is powered by the 6-cylinder 6T-590 (359 cu in), rated at 97 gross horsepower. These engines deliver dependable torque and efficient performance for earthmoving and grading operations.

Fuel System
Each model carries a 47-gallon fuel tank, ensuring long operating hours between refueling. The fuel system is engineered for reliable delivery under sustained workloads, supporting extended duty cycles on the job site.

Electrical
A 12-volt negative-ground system with a 65-amp alternator provides reliable starting power and supports auxiliary electrical demands across all three models. The system is designed for durability and simplified service.

Tracks
The 650H is equipped with 16-inch wide tracks, while the 750H LT uses 18-inch shoes and the 850H WT runs on 24-inch shoes. Each undercarriage includes 38 shoes per side with six rollers, providing excellent ground contact and stability. Ground pressures range between 5.4 and 5.5 psi, optimizing flotation and traction for varied terrain conditions.

Power Train
The 650H features a 4-speed torque converter, while the 750H and 850H employ Case’s constant-mesh modulated transmission with four forward and four reverse speeds. These designs ensure smooth power transfer and operator control in heavy pushing and fine grading applications.

Brakes
All three models utilize hydraulic wet-disc brakes for reliable stopping power. Their sealed design minimizes maintenance and ensures long-term durability even in demanding site conditions.

Hydraulics
The 650H features a 10.9-gallon hydraulic system, while the 750H LT and 850H WT are equipped with larger systems providing approximately 24 GPM at 2,200 psi. These open-center hydraulic systems deliver responsive control for mounted blades and attachments, ensuring efficient grading and dozing performance.

Mounted Equipment
The Case H-Series dozers are equipped with straight or six-way PAT (power-angle-tilt) blades. Blade capacities measure around 2.0 yd³ for the 750H and 850H, with widths up to 9 feet and heights of 36 inches, giving operators versatility for site preparation, backfilling, and precision grading tasks.

Key Highlights

• 650H: 80 HP 4-cyl diesel, 16-in tracks, 16,091 – 17,440 lb
• 750H LT: 90 HP 4-cyl diesel, 18-in tracks, ~17,284 lb
• 850H WT: 97 HP 6-cyl diesel, 24-in tracks, ~17,519 lb
• Fuel capacity: 47 gallons; Hydraulic capacity: 10.9 – 14 gallons
• Hydraulic output up to 24 GPM at 2,200 psi
• Transmissions: torque converter (650H) and constant-mesh 4F/4R (750H, 850H)
• Operator station: Four-post ROPS canopy with clear visibility
• Blade options: straight or six-way PAT with up to 2.0 yd³ capacity