Case 1450B, 1455B Crawler Dozer Repair Manual

The Case 1450B and 1455B crawler dozers, manufactured between the late 1970s and mid-1980s, represent heavy-duty equipment built for large-scale construction, land clearing, and utility work. Both models share the rugged A504BDT six-cylinder turbocharged diesel engine, while differing in configuration: the 1450B as a crawler dozer equipped with a large straight or PAT blade, and the 1455B as a loader-dozer equipped with a bucket for material handling. With operating weights of 29,000 lb and 32,000 lb respectively, these machines deliver strong pushing and loading capability with proven Case durability.

10 – General
The 1450B has an approximate operating weight of 29,000 lb, while the 1455B is heavier at about 32,000 lb. Both were designed for demanding applications with reinforced frames, strong track systems, and versatile configurations for dozing, grading, or loading work.

20 – Engine
Both machines are powered by the Case A504BDT six-cylinder turbocharged diesel engine, with 504 cu in (8.3 L) displacement. The engines produce around 152 gross horsepower and 140 net horsepower at 2100 rpm, offering high torque output and consistent performance under heavy load.

30 – Fuel System
Equipped with a 65-gallon fuel tank, the 1450B and 1455B are capable of long duty cycles. The system ensures reliable fuel delivery for sustained work across a wide range of operating conditions.

40 – Electrical System
Both dozers use a 12-volt electrical system with an alternator to support reliable starting, lighting, and auxiliary electrical demands. The simple layout allows straightforward service and maintenance.

50 – Track System
Each machine uses 24-inch track shoes with 36 shoes per side, supported by six bottom rollers and one carrier roller. The track system provides stability and traction on varied terrain while distributing weight effectively for heavy pushing and loading tasks.

60 – Power Train
The 1450B and 1455B are fitted with a four-speed full power-shift transmission offering four forward and four reverse speeds. Travel speeds reach about 5 mph forward and 7 mph reverse, ensuring flexibility for both production work and job site mobility.

70 – Brakes
Hydraulic wet-disc brakes deliver consistent and durable stopping power. A parking brake provides added safety when the machines are idle or during transport.

80 – Hydraulic System
Both models employ an open-center hydraulic system with an 18-gallon fluid capacity. The hydraulics deliver smooth, responsive performance for the 1450B’s 3.5 yd³ blade or the 1455B’s 3.0–3.5 yd³ bucket capacity, supporting efficient material handling and earthmoving.

90 – Mounted Equipment
The 1450B is typically equipped with a straight or six-way PAT blade, while the 1455B uses a loader bucket for excavation and loading work. Optional rear-mounted attachments such as rippers and winches extend their versatility for land clearing, site prep, and construction applications.

Key Highlights

• Production years: 1977 – 1985 (1450B), 1979 – 1985 (1455B)
• Engine: Case A504BDT, 6-cyl turbo diesel, 504 cu in (8.3 L), ~152 gross HP / 140 net HP
• Operating weight: ~29,000 lb (1450B); ~32,000 lb (1455B)
• Fuel capacity: 65 gallons; Hydraulic capacity: 18 gallons
• Transmission: 4-speed full power-shift, 4F / 4R
• Travel speeds: ~5 mph forward, ~7 mph reverse
• 1450B blade capacity: ~3.5 yd³; 1455B bucket capacity: 3.0–3.5 yd³
• Track system: 24-in shoes, 36 shoes per side, 6 rollers + 1 carrier roller
• Brakes: Hydraulic wet-disc with parking brake
• Electrical: 12-volt system with alternator
• Operator station: ROPS canopy standard, optional enclosed cab