Case 1150D, 1155D Crawler Dozer Repair Manual

The Case 1150D and 1155D crawler dozers, produced between 1983 and 1986, are part of Case’s D-series lineup of industrial-grade machines. These models were engineered for strength, durability, and versatility across heavy earthmoving, grading, and loader-dozer applications. With powerful diesel engines, full power-shift transmissions, and robust undercarriages, the 1150D and 1155D deliver dependable performance on construction and industrial job sites.

General
The Case 1150D weighs approximately 22,608 lb, while the larger Case 1155D comes in at around 26,132 lb. Both machines feature rugged crawler frames, ROPS operator protection, and are designed for stability and long service life in demanding field conditions.

Engine
The Case 1150D is powered by a Case six-cylinder diesel engine rated at 125 gross horsepower (110 net). The Case 1155D uses a similar six-cylinder diesel rated at approximately 118 net horsepower. These engines provide high torque output, reliability, and the power necessary for both dozer and loader operations.

Fuel System
The 1150D is equipped with a 52-gallon fuel tank, supporting long duty cycles between refueling. The 1155D’s fuel system provides comparable capacity, ensuring continuous productivity during extended shifts.

Electrical System
Both machines use heavy-duty 12/24-volt electrical systems with alternator support, providing reliable starting power and auxiliary system operation in the field.

Track and Suspension
Crawler undercarriages provide traction, flotation, and stability. The 1150D features a slightly lighter track setup suited for dozer operations, while the 1155D’s reinforced track and suspension system are designed to support loader functions with higher operating weight.

Power Train
The Case 1150D uses a four-speed full power-shift transmission, offering four forward and four reverse speeds for efficient operation under load. The 1155D incorporates a heavy-duty drivetrain optimized for loader and dozer versatility, providing smooth power transfer across varied tasks.

Brakes
Both models employ hydraulic wet-disc brakes, designed for consistent stopping power and long service life with minimal maintenance requirements.

Hydraulics
The Case 1150D employs an open-center hydraulic system delivering around 50 GPM, supporting blade operations with precision and reliability. The 1155D is equipped with loader-grade hydraulics designed to handle a 2 yd³ bucket capacity, ensuring powerful and responsive material handling.

Mounted Equipment
The 1150D typically features angle, tilt, and pitch blades suitable for heavy grading and dozing. The 1155D is configured as a loader-dozer, supporting a bucket capacity of approximately 2 cubic yards for efficient earthmoving and material loading. Both machines support optional rear-mounted attachments such as winches or rippers to expand their utility.

Key Highlights

• Production years: 1983 – 1986
• 1150D: Six-cylinder diesel, 125 gross HP / 110 net HP, 22,608 lb operating weight
• 1155D: Six-cylinder diesel, ~118 net HP, 26,132 lb operating weight
• Fuel capacity: 52 gallons (1150D); comparable capacity for 1155D
• Transmission: 4-speed full power-shift (1150D); heavy-duty powertrain for loader-dozer (1155D)
• Hydraulics: 1150D open-center ~50 GPM; 1155D loader hydraulics with 2 yd³ bucket capacity
• Track systems designed for traction, flotation, and stability
• Hydraulic wet-disc brakes for reliable stopping power
• Mounted equipment: 1150D angle/tilt/pitch blade; 1155D loader bucket