Case 1150B Crawler Dozer Repair Manual

The Case 1150B crawler dozer, produced between 1972 and 1977, was built as a powerful mid-size dozer in Case’s 1150 series. Featuring a durable 6-cylinder diesel engine, full power-shift transmission, and open-center hydraulic system, the 1150B was engineered for productivity, reliability, and versatility in earthmoving, grading, and construction applications.

General
With an operating weight of approximately 23,874 lb, the Case 1150B offers excellent balance between traction and stability. Its compact dimensions—about 13 ft 1 in long, 8 ft 6 in wide, and 10 ft 4 in tall—allow it to work efficiently on various job sites. The ROPS operator canopy provides safety and visibility, while rugged construction ensures long service life.

Engine
The 1150B is powered by a Case 6-cylinder liquid-cooled diesel engine, displacing 451 cu in (7.4 L). Rated at 125 gross horsepower and 105 net horsepower at 2,100 rpm, with maximum torque of 359 lb-ft at 1,300 rpm, this powerplant provides ample force for heavy-duty dozing and grading.

Fuel System
The fuel tank capacity of 52 gallons supports long work shifts without interruption. The engine’s efficient fuel delivery system ensures dependable combustion under heavy workloads.

Hydraulics
The open-center hydraulic system delivers approximately 52.1 GPM at a relief pressure of 2,200 psi. With a hydraulic fluid capacity of 14.7 gallons, the system provides responsive control for the six-way blade, ensuring smooth grading and dozing operations.

Track and Suspension
The undercarriage includes a reinforced crawler track system designed for stability and durability. Ground clearance is approximately 1.09 ft, allowing the machine to traverse uneven terrain while maintaining balance and traction.

Power Train
A 4-speed power-shift transmission with four forward and four reverse speeds delivers smooth gear changes under load. Maximum forward speed is about 6 mph, while reverse speed reaches up to 7.2 mph, giving the machine efficient travel capability on and off the jobsite.

Brakes
Hydraulic wet-disc brakes provide reliable stopping power, designed for long service life with minimal maintenance even in demanding working conditions.

Electrical
The electrical system provides starting, lighting, and auxiliary power to essential systems. With its simple design, the system is durable and easy to maintain in rugged field conditions.

Mounted Equipment
The Case 1150B is commonly fitted with a six-way PAT blade, offering a capacity of around 2.5 cubic yards. This versatility allows for dozing, grading, backfilling, and fine finishing. Optional rear-mounted rippers or winches extend the machine’s capability in construction and land-clearing projects.

Key Highlights

• Production years: 1972 – 1977
• Engine: 6-cylinder, 451 cu in (7.4 L) diesel, 125 gross HP / 105 net HP
• Torque: 359 lb-ft @ 1,300 rpm
• Operating weight: 23,874 lb
• Dimensions: 13 ft 1 in (L) × 8 ft 6 in (W) × 10 ft 4 in (H)
• Ground clearance: 1.09 ft
• Fuel capacity: 52 gallons
• Hydraulic system: Open-center, 52.1 GPM @ 2,200 psi, 14.7 gal reservoir
• Transmission: 4-speed Power-Shift, 4F / 4R, speeds up to 6 mph forward, 7.2 mph reverse
• Blade: Six-way PAT blade, ~2.5 yd³ capacity
• Brakes: Hydraulic wet-disc
• Operator station: ROPS canopy with clear visibility