Case 1650M Crawler Dozer Repair Manual

The Case 1650M crawler dozer is part of Case’s advanced M-Series lineup, designed to deliver superior productivity, power, and operator comfort. Featuring a Tier 4 Final FPT 6.7 L diesel engine, hydrostatic dual-path drive, and advanced load-sensing hydraulics, the 1650M provides excellent pushing power, precise control, and fuel-efficient operation. With operating weights from 37,700 to 39,500 lb depending on configuration, it is ideally suited for heavy construction, land clearing, and site preparation tasks.

Introduction
The Case 1650M combines robust engineering with modern technology to provide high tractive effort and versatility. Available in XLT, WT, and LGP configurations, the machine adapts to a wide range of soil and job site conditions with optimized blade capacities and ground pressures.

Engine – 10
The 1650M is powered by an FPT 6.7 L six-cylinder turbocharged diesel engine producing 168 gross horsepower (150 net HP). With peak torque of approximately 627 lb-ft at 1,400 rpm, the engine offers the power and efficiency needed for sustained heavy dozing while meeting Tier 4 Final emissions standards.

Hydrostatic Drive – 29
The dual-path hydrostatic transmission provides infinite variable speed control and counter-rotation, allowing excellent maneuverability and precise grading. The system delivers smooth, continuous power to the tracks, with travel speeds reaching up to ~5.8 mph.

Brakes And Controls – 33
Dynamic hydrostatic braking is supported by hydraulic wet-disc brakes. Operator-friendly electro-hydraulic controls provide precision and reduce fatigue, enhancing productivity over long work shifts.

Hydraulic Systems – 35
The load-sensing hydraulic system features a variable-displacement piston pump capable of producing ~43 GPM at 3,000 psi. With a reservoir capacity of 23 gallons, the hydraulics deliver responsive blade and tool control under heavy workloads.

Tracks And Track Suspension – 48
The undercarriage includes eight bottom rollers and two carrier rollers per side, with 44–46 shoes per track. Shoe widths range from 22 to 30 inches, with ground pressures from 6.2 psi in XLT to ~4.9 psi in LGP variants, providing traction and flotation in varied conditions.

Cab Climate Control – 50
The ROPS/FOPS-certified cab provides excellent visibility, noise reduction, and operator comfort. Heating and optional air conditioning systems ensure all-season productivity, while ergonomic seat and controls improve operator efficiency.

Electrical Systems – 55
A 24-volt electrical system powered by dual 12V batteries and a 100-amp alternator provides reliable starting and supports auxiliary electrical needs, lighting, and diagnostics systems.

Dozer Blade And Arm – 86
The 1650M is equipped with heavy-duty six-way PAT blades, with heaped capacities ranging from 5.0 to 5.6 yd³ depending on configuration. Designed for versatility, the blade arms provide smooth, responsive control for grading, cutting, and spreading.

Tools – 89
Optional rear-mounted tools such as winches and rippers expand the 1650M’s capabilities for land clearing, site preparation, and utility work, making it a versatile addition to any fleet.

Platform, Cab, Bodywork, And Decals – 90
The cab and bodywork are ruggedly constructed with reinforced panels and easy service access. Case M-Series branding highlights its modern design and reliability.

Electrical Schematic
The service manual includes complete electrical schematics for diagnostics and repair of the 24V system.

Hydraulic Schematic
Detailed hydraulic schematics are also provided for accurate servicing of the hydrostatic drive and blade control systems.

Key Highlights

• Engine: FPT 6.7 L turbo diesel, 168 gross HP / 150 net HP, ~627 lb-ft torque
• Operating weight: 37,756 – 39,573 lb (XLT / LGP)
• Transmission: Hydrostatic dual-path drive, variable speed up to 5.8 mph
• Fuel capacity: 65 gallons; Hydraulic capacity: 23 gallons
• Hydraulic output: 43 GPM @ 3,000 psi
• Blade: Six-way PAT blade, 5.0 – 5.6 yd³ capacity
• Tracks: 8 bottom rollers, 2 carrier rollers, 22–30 in shoes
• Ground pressure: 6.2 psi (XLT) to ~4.9 psi (LGP)
• Electrical: 24V system, dual 12V batteries, 100A alternator
• ROPS/FOPS cab with optional HVAC for operator comfort
• Optional rear tools: rippers and winches