Case 650L Crawler Dozer Repair Manual

The Case 650L Tier 3 crawler dozer is part of the L-Series lineup, engineered for power, precision, and reliability in construction, grading, and utility applications. Built with a hydrostatic transmission, efficient Case diesel engine, and durable undercarriage, the 650L delivers smooth performance, excellent fuel economy, and operator comfort for long working hours.

Introduction
The 650L represents Case’s continued evolution in mid-size crawler dozers, offering operators a blend of horsepower, maneuverability, and rugged construction. With operating weights from 16,250 to 17,550 lb (depending on LT, WT, or LGP configuration), the machine is designed for versatility in a wide range of site conditions.

Distribution Systems
The dual-path hydrostatic drive provides independent power to each track, controlled by a single joystick. This system ensures smooth power distribution, effortless steering, and precise control, even under heavy loads or in tight working areas.

Power Production
The Case 650L is powered by the Case 445TA/EG7a 4.5 L 4-cylinder diesel engine, rated at 81 gross horsepower (74 net). The Tier 3 compliant engine delivers reliable torque, fuel efficiency, and reduced emissions while maintaining high productivity in demanding conditions.

Power Train
A hydrostatic PowerStat transmission ensures infinite variable speeds up to 5.5 mph, eliminating gear shifting and providing smooth power transfer. This allows operators to seamlessly switch between heavy pushing and fine grading tasks.

Travelling
The undercarriage is fitted with 27-inch track shoes on LGP versions and narrower shoes on LT and WT models. With approximately 84 inches of track on the ground and six rollers per side, the 650L maintains traction, flotation, and stability across varied terrain types.

Body and Structure
The machine’s heavy-duty frame and durable undercarriage components are built for long service life. A ROPS operator canopy provides protection, while ergonomic controls and clear visibility enhance comfort and safety during operation.

Tool Positioning
Blade movement is responsive and precise through joystick control. Power-angle-tilt (PAT) blades are standard, enabling operators to angle, tilt, and lift for efficient earthmoving, grading, and backfilling tasks.

Tools and Couplers
The 650L supports multiple blade configurations with a standard 10-ft PAT blade offering a 2.2 yd³ capacity. Rear-mounted attachments such as rippers and winches can also be fitted, extending versatility for land clearing and site preparation.

Electrical Schematic
The 12-volt electrical system, equipped with a 90-amp alternator, ensures reliable starting and supports work lights and auxiliary functions. The design emphasizes ease of service and field durability.

Hydraulic Schematic
The hydraulic system uses a variable-displacement piston pump delivering approximately 20–21 GPM at 3,025 psi. With a hydraulic capacity of 20 gallons, it provides smooth, powerful control of blades and attachments while maintaining cooling efficiency during long-duty cycles.

Key Highlights

• Engine: Case 445TA/EG7a 4.5 L 4-cyl diesel, 81 gross HP / 74 net HP
• Operating weight: 16,250 – 17,550 lb (LT/WT/LGP configurations)
• Fuel capacity: 41 gallons; Hydraulic capacity: 20 gallons
• Dual-path hydrostatic drive with single-lever joystick control
• Track shoes: 27 in on LGP with 84 in ground contact, 6 rollers/side
• Hydraulic output: ~20–21 GPM at 3,025 psi
• PAT blade: 10 ft wide, 2.2 yd³ capacity, ~33 in height
• 12-volt electrical system with 90-amp alternator
• ROPS canopy with ergonomic controls and excellent visibility
• Optional ripper and winch attachments for added versatility