Case 850D, 855D Crawler Service Manual PDF

This Service Manual covers the Case 850D and 855D Crawler models. It provides detailed technical information for servicing, maintaining, troubleshooting, and repairing the crawler and its major systems. The manual includes service specifications, torque information, maintenance and lubrication, engine and fuel-system procedures, electrical systems and wiring diagrams, track systems, power train, brakes, hydraulics, and mounted equipment.

The service procedures in this manual are intended for qualified technicians. Always follow the manufacturer's safety guidelines and service recommendations, and use the required tools and approved procedures when performing maintenance or repairs.

General Service Information

The manual provides general service information, including safety rules, service procedures, torque specifications, maintenance and lubrication requirements, and general and detailed engine specifications.

The engine section covers engine removal and installation, engine accessories, stall tests, cylinder head and valve train, cylinder block, pistons, rods, camshaft, crankshaft, lubrication and cooling systems, turbocharger service, and turbocharger failure analysis.

The fuel system section includes fuel lines, fuel tank and engine controls, fuel filters, fuel system service, and the Bosch fuel injection pump, drive gear, and timing procedures.

The electrical section provides removal and installation procedures for electrical components, electrical system specifications and troubleshooting, wiring diagrams, gauges, batteries, starter and starter solenoid, and Delco-Remy alternator information.

The track section covers inspection and servicing of track system components, Case lubricated track, standard track and track frames, idlers, track adjusters, recoil housing, sprockets, carrier rollers, and track rollers.

The power train section provides detailed information on the transmission and torque converter, including troubleshooting, charging pump, control and modulator valves, torque converter removal and installation, transmission, final drive, transmission controls, and drive shaft.

The brake section covers brake pedals, master cylinder removal and installation, brake adjustment, bleeding procedures, and brake system service.

The hydraulic section includes hydraulic diagrams, troubleshooting and pressure checks, hydraulic system cleaning, Rexroth and Vickers hydraulic pumps, equipment control valves, cylinders, backhoe and stabilizer control valves, and related removal and installation procedures.

The mounted equipment section covers air-conditioning troubleshooting and service, loader, dozer blade, ripper, ROPS cab and canopy, operator's seat and seat belt, suspension seat, backhoe, and winch. The manual also includes wiring diagrams and hydraulic schematics for dozer and loader systems.

Table of Contents

GENERAL
Safety Rules, Service Manual Introduction, and Torque Specifications
Maintenance and Lubrication
General Engine Specifications
Detailed Engine Specifications

ENGINES
Engine and Radiator Removal and Installation
Engine Accessories (Air Cleaner, Ether Injection System, Muffler, Turbocharger, and Torque Converter)
Engine Stall Tests
Cylinder Head and Valve Train
Cylinder Block, Pistons, Rods, Camshaft, Main Bearings, Oil Seals, Flywheel and Crankshaft
Lubrication System
Cooling System
Turbocharger
Turbocharger Failure Analysis

FUEL SYSTEM
Fuel Lines, Fuel Tank, and Engine Controls
Fuel System and Filters
Bosch Fuel Injection Pump, Drive Gear, and Timing
Fuel Filters

ELECTRICAL
Removal and Installation of Electrical Components
Electrical System Specifications and Troubleshooting
Wiring Diagrams
Gauges
Batteries
Starter and Starter Solenoid
Delco-Remy Alternator
45 Amp Alternator A186124
45 Amp Alternator A187916

TRACK
Inspection of Track System Components
Case Lubricated Track
Standard Track and Track Frame
Idler, Track Adjuster, and Recoil Housing
Sprocket
Carrier Roller
Track Rollers

POWER TRAIN
Transmission/Torque Converter Diagram and Troubleshooting
Charging Pump
Transmission Control Valve
Modulator Valve
Removal and Installation of Torque Converter
Torque Converter
Transmission
Final Drive
Transmission Controls
Drive Shaft

BRAKES
Brake Pedals, Removal and Installation of Master Cylinder, Adjustment and Removing Air From Brake System
Master Cylinder
Brake

HYDRAULICS
Hydraulic Diagrams, Troubleshooting and Pressure Checks
Cleaning the Hydraulic System
Rexroth Hydraulic Pump
Vickers Hydraulic Pump
Equipment Control Valve
Cylinders
Backhoe Control Valve
Removal and Installation of Stabilizer Control Valve
Stabilizer Control Valve

MOUNTED EQUIPMENT
Air Conditioning Troubleshooting
Air Conditioning System
Loader
Blade on Dozer Models
Ripper
ROPS Cab and Canopy
Operator's Seat and Seat Belt
Suspension Seat
Backhoe
Winch

CONTENTS OF POCKET
Wiring Diagram
Hydraulic Schematic for Dozer
Hydraulic Schematic for Loader

Digital PDF Delivery

After your purchase is confirmed, the manual will be sent electronically to the email address provided with your order. Delivery usually takes approximately 1–10 minutes. Please double-check your email address at checkout and look in your spam or junk folder if you do not receive the message.

Printable PDF Manual and Support

The manual is provided in a printable PDF format, allowing you to easily print service procedures, specifications, diagrams, troubleshooting information, and repair instructions whenever needed for workshop use.

If you have any questions regarding the manual or your order, customer support is available to assist you. Assistance is provided both before and after your purchase.