Case 1650K Crawler Dozer Repair Manual

The Case 1650K crawler dozer, built in the mid-2000s, represents one of Case’s heavy-duty models designed for large-scale earthmoving, grading, and site-preparation projects. Featuring a Cummins six-cylinder turbocharged diesel engine, power-shift transmission, and advanced hydraulic system, the 1650K offers strong power, operator comfort, and rugged construction for demanding work environments.

Section 0 – Generalities
With an operating weight ranging from 33,780 lb (XLT) to 35,700 lb (LGP), the Case 1650K delivers exceptional pushing power and flotation. Its wide blade, robust undercarriage, and multiple configuration options make it a versatile crawler dozer capable of adapting to different terrains and applications.

Section 1 – Engine
The 1650K is powered by a Cummins 6BTAA-5.9, six-cylinder turbocharged diesel engine with a displacement of 360 cu in (5.9 L). Rated at 150 gross horsepower and 140 net horsepower at 2,200 rpm, it produces a maximum torque of 479 lb-ft at 1,300 rpm. The engine is built for durability, fuel efficiency, and high torque output under heavy loads.

Section 2 – Transmission
The power train features a 3-speed countershaft power-shift transmission with three forward and three reverse speeds. With maximum travel speeds of 6.8 mph forward and 8.1 mph reverse, the system provides smooth gear changes under load, allowing efficient operation in both dozing and travel applications.

Section 3 – Final Drives
Heavy-duty final drives are designed to withstand the stress of constant pushing and grading. Their rugged construction ensures long service life and reduced maintenance needs.

Section 4 – Brakes and Steering Differential
Hydraulic wet-disc brakes provide reliable stopping power with minimal maintenance. Differential steering delivers smooth, controlled turns with consistent power to both tracks, enhancing maneuverability in confined work areas.

Section 5 – Undercarriage
The undercarriage includes 48 shoes per side with 22-inch track shoes, supported by eight rollers and two carrier rollers. With 118 inches of track-on-ground, the system provides excellent flotation and stability. Ground pressures measure around 6 psi on the XLT configuration and 4.8 psi on the LGP version, making the machine effective in both firm and soft soils.

Section 6 – Dozer Equipment Hydraulic System
The 1650K is equipped with a load-sensing piston pump hydraulic system delivering approximately 32 GPM. The system ensures efficient power distribution for blade control, with a hydraulic fluid capacity of 16 gallons. The standard PAT (power-angle-tilt) blade offers a capacity of 4.0 yd³ on XLT models and 4.5 yd³ on LGP models, with widths up to 10.5 ft.

Section 7 – Electrical System
The machine is powered by a 24-volt electrical system with dual 12-volt batteries and a 70-amp alternator. This provides reliable starting power and supports lighting, diagnostics, and auxiliary functions for field operations.

Key Highlights

• Engine: Cummins 6BTAA-5.9, 6-cyl turbo diesel, 150 gross HP / 140 net HP
• Operating weight: 33,780 lb (XLT) – 35,700 lb (LGP)
• Max torque: 479 lb-ft @ 1,300 rpm
• Transmission: 3-speed power-shift, 3F / 3R; speeds up to 6.8 mph forward, 8.1 mph reverse
• Track system: 48 shoes/side, 22-in track shoes, 8 rollers, 2 carrier rollers
• Track-on-ground: 118 in; ground pressure ~6 psi (XLT), ~4.8 psi (LGP)
• Hydraulics: Load-sensing piston pump, ~32 GPM, 16-gal reservoir
• Blade: PAT blade, 4.0 – 4.5 yd³ capacity, widths up to 10.5 ft
• Fuel capacity: ~71 gallons
• Electrical: 24 V, dual 12 V batteries, 70-amp alternator