Case 1150 Crawler Dozer Repair Manual

The Case 1150 crawler dozer, introduced in the late 1960s and continuing through the 1980s in multiple series (1150, 1150B, 1150C, etc.), was engineered as a powerful and versatile crawler tractor for construction, earthmoving, and industrial applications. With a robust 6-cylinder diesel engine, heavy-duty undercarriage, and reliable hydraulic and power-shift systems, the 1150 became one of Case’s most proven medium-to-large crawler dozers.

General
With an operating weight of approximately 24,970 lb, the Case 1150 provides excellent stability, traction, and pushing power. The design emphasizes reliability and ease of service, with options for open or ROPS canopy operator stations and optional cab enclosures with heating.

Engines
The 1150 is powered by the Case A451BD, a 6-cylinder, liquid-cooled diesel engine with a displacement of 451 cu in (7.4 L). Rated at 125 gross horsepower and around 105 net horsepower, this powerplant provides strong torque for heavy earthmoving and dozing tasks. The engine is designed for durability and long service life under sustained load conditions.

Fuel System
A diesel fuel system with a 52-gallon capacity allows extended operation between refueling intervals. The system is engineered for efficient combustion and steady fuel delivery, supporting long working days on job sites.

Hydraulics
The Case 1150 employs an open-center hydraulic system with an approximate pump flow of 33 GPM and system pressure of 2,200 psi. With a reservoir capacity of 15 gallons, the system provides responsive, consistent control of the mounted blade and optional attachments. The standard blade offers around 2.5 cubic yards of heaped capacity, suitable for heavy cutting and grading.

Track and Suspension System
The heavy-duty crawler undercarriage supports stability, traction, and weight distribution across challenging terrain. Wide track shoes and a reinforced suspension system ensure longevity and improved flotation in difficult ground conditions.

Power Train
The 1150 features a 4-speed Power-Shift transmission, providing smooth shifting under load and consistent power delivery. This transmission design reduces operator fatigue while ensuring efficient performance across varied working speeds.

Electrical System
A 24-volt electrical system, using two 12-volt batteries in series, powers the starting system, lighting, and auxiliary functions. An alternator provides reliable charging capacity, ensuring dependable operation in harsh environments.

Mounted Equipment
The Case 1150 is typically fitted with a large front-mounted dozer blade (straight or six-way, depending on configuration), with a heaped capacity of about 2.5 cubic yards. Rear-mounted ripper options expand the machine’s versatility, allowing it to handle site preparation, material breaking, and other demanding tasks.

Key Highlights

• Production: 1969 – 1983 across various 1150 series models
• Engine: Case A451BD, 6-cyl, 451 cu in (7.4 L), 125 gross HP / 105 net HP
• Fuel capacity: 52 gallons; Hydraulic capacity: 15 gallons
• Hydraulic flow ~33 GPM @ 2,200 psi
• Operating weight: ~24,970 lb
• Transmission: 4-speed Power-Shift
• Blade capacity: ~2.5 yd³ heaped
• Electrical: 24 V system with alternator
• Track system: reinforced crawler undercarriage with wide shoes
• Optional rear ripper attachments for expanded capability