Case 750L, 850L Crawler Dozer Repair Manual

The Case 750L and 850L crawler dozers are part of Case’s L-Series lineup, designed for powerful earthmoving, grading, and site-preparation operations. Featuring turbocharged six-cylinder diesel engines, hydrostatic dual-path transmissions, and heavy-duty undercarriages, both models provide excellent productivity, operator comfort, and reliability in demanding job site conditions. With operating weights ranging from ~38,000 lb (750L) to ~44,000 lb (850L), these machines deliver a balance of maneuverability and pushing power across multiple applications.

Introduction
The 750L and 850L were engineered for performance and versatility, offering multiple configurations including XLT, LT, WT, and LGP versions. Their robust build, wide track options, and advanced blade designs make them ideal for construction, land clearing, and utility projects.

Distribution Systems – A
Both dozers are equipped with a Case/FPT six-cylinder turbocharged diesel engine with 6.7 L displacement. The 750L produces 150 gross horsepower (139 net) with ~480 lb-ft of torque, while the 850L delivers 185 gross horsepower (170 net) with ~520 lb-ft of torque. Engines are tuned for durability, torque rise, and fuel efficiency.

Power Production – B
A dual-path hydrostatic transmission provides infinite speed control, seamless power transfer, and smooth counter-rotation for enhanced maneuverability. This design allows precise control during fine grading and excellent pushing force during heavy dozing tasks.

Power Train – C
The hydrostatic power train delivers independent power to each track, ensuring excellent traction and smooth control. Travel speeds reach up to ~6 mph, supporting efficient site movement without sacrificing pushing power.

Travelling – D
The track system includes 7 bottom rollers and 2 carrier rollers per side, with track shoe widths ranging from 22 to 30 inches depending on configuration. Ground pressure ranges from ~6 psi in XLT models to ~4.5 psi in LGP versions, allowing effective performance across firm and soft ground conditions.

Body And Structure – E
Both models feature a reinforced mainframe and ROPS/FOPS-certified operator cab. The cab offers wide visibility, ergonomic controls, and optional HVAC systems for all-weather productivity.

Tool Positioning – G
The Case PAT (power-angle-tilt) blade provides superior control and versatility for dozing, grading, and backfilling tasks. The 750L blade capacity is approximately 4.0 yd³, while the 850L offers around 5.0 yd³, ensuring strong material handling productivity.

Working Arm – H
Heavy-duty blade lift and tilt arms, supported by load-sensing hydraulics, provide smooth, responsive control for demanding site work. Hydraulic output is ~37 GPM on the 750L and ~39 GPM on the 850L.

Tools And Couplers – J
Rear equipment options include rippers and winches, extending the machines’ versatility in site-prep and land-clearing applications.

Hydraulic Schematic
Both dozers use load-sensing piston pump systems with hydraulic fluid capacities of 22 gal (750L) and 23 gal (850L). System pressures reach ~2,830 psi, providing consistent blade response.

Electrical Schematic
A 24-volt electrical system with dual 12-volt batteries and a 65-amp alternator supports reliable starts, lighting, and auxiliary electrical needs in rugged field conditions.

Key Highlights

• Engine: Case/FPT 6.7 L turbo diesel, 150 HP gross (750L) / 185 HP gross (850L)
• Operating weight: ~38,000 lb (750L) / ~44,000 lb (850L)
• Transmission: Hydrostatic dual-path drive with infinite variable control
• Blade capacity: 750L ~4.0 yd³ / 850L ~5.0 yd³
• Fuel capacity: 65 gallons; Hydraulic capacity: 22–23 gallons
• Hydraulic output: 37 GPM (750L) / 39 GPM (850L)
• Tracks: 7 bottom rollers, 2 carrier rollers, shoe widths 22–30 in
• Ground pressure: ~6 psi (XLT) down to ~4.5 psi (LGP)
• Cab: ROPS/FOPS with optional HVAC for operator comfort
• Optional rear attachments: winch and rippers for expanded capability