Part of the Case Repair Manuals.
This is the complete factory service manual for the Case 850D and 855D crawler dozers, 1422 pages from the diesel engine through the dozer blade, ripper, and winch. It is the same book a Case dealer technician works from, with removal and installation steps, engine and hydraulic specifications, torque values, electrical and hydraulic schematics, undercarriage and final drive service, and troubleshooting for the torque converter power shift drivetrain, so you can diagnose a fault and do the repair yourself.
What's Inside This Case 850D, 855D Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Safety Rules, Service Manual Introduction, Standard Torque Specifications, General and Detailed Engine Specifications, Maintenance and Lubrication | |
| Engine | Engine and Radiator Removal and Installation, Engine Accessories, Ether Injection, Stall Tests, Cylinder Head and Valve Train, Cylinder Block 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 Injectors | |
| Electrical | Electrical Component Removal and Installation, Specifications and Troubleshooting, Electrical Schematics, Instruments and Gauges, Batteries, Starter and Solenoid, Alternator | |
| Undercarriage | Inspection of Track System Components, Case Lubricated Track, Standard Track and Track Frame, Idler, Track Adjuster and Recoil Housing, Track Rollers, Sprocket | |
| Power Train | Transmission and Torque Converter Diagram and Troubleshooting, Charging Pump, Transmission Control Valve, Transmission, Final Drive, Transmission Controls | |
| Brakes | Steering Clutch and Brake Service, Removal and Installation, Adjustment and Troubleshooting | |
| Hydraulics | Hydraulic Diagrams, Troubleshooting and Pressure Checks, Cleaning the Hydraulic System, Rexroth and Vickers Hydraulic Pumps, Control Valves, Cylinders | |
| Mounted Equipment | Loader, Dozer Blade, Ripper, Winch, Air Conditioning, ROPS Cab and Canopy, Operators Seat and Seat Belts, Hydraulic Schematics for Dozer and Loader |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel tank capacity | 144 litres (38 US gallons) | |
| Engine crankcase oil capacity | 15.2 litres (16 US quarts) | |
| Hydraulic reservoir capacity | 45 litres (12 US gallons) | |
| Engine options | 6-590 naturally aspirated, 6T-590 turbocharged, 6TA-590 turbo aftercooled diesel |
Case 850D, 855D Common Problems This Manual Covers
Vibration, grinding, or gear damage traced to the final drive
These crawlers are known for final drive dowel pin and shock absorber failure that shows up as vibration and noise. Pull and inspect the final drive per the Power Train section, replace the dowel pin and shock absorber, and check the gears for damage before the failure spreads through the drive.
Manual Section: Power TrainSudden loss of tracking power or the machine stops unexpectedly
This crawler uses a torque converter and power shift transmission, so check transmission oil level, charging pump output, and the transmission control valve pressures using the Power Train pressure checks. Confirm the torque converter and final drives before condemning the transmission itself.
Manual Section: Power TrainGrinding noise or fast wear from the crawler undercarriage
Set track tension with the track adjuster and recoil housing to the manual specification, since a mis adjusted track chews through bushings and sprockets. Inspect the idler, track rollers, sprocket, and track bushings for wear and service the Case lubricated track as the Undercarriage section describes.
Manual Section: UndercarriageDozer blade or loader is slow, weak, or drifts down
Run the hydraulic pressure checks in the Hydraulics section and compare to the system specifications. Inspect the Rexroth or Vickers pump and the control valves for internal leakage, and check the lift cylinders for bypassing seals before replacing a major component.
Manual Section: HydraulicsTurbo diesel runs hot, smokes, or lacks power
Check the air cleaner and the turbocharger first, since a leak or restriction chokes the engine. Confirm the cooling system thermostat, water pump, and clean radiator and oil cooler cores, and review the Turbocharger Failure Analysis section before replacing the turbo on the 6T-590 or 6TA-590 engine.
Manual Section: EngineFrequently Asked Questions
What does this Case 850D and 855D service manual cover?
It is the full factory repair manual for the 850D and 855D crawler dozers, 1422 pages covering the 6-590, 6T-590, and 6TA-590 diesel engines, fuel and electrical systems, the undercarriage and tracks, the torque converter and power shift transmission, steering clutches and brakes, hydraulics, and the loader, dozer blade, ripper, and winch attachments with specifications, schematics, and troubleshooting.
Does it cover both the 850D and the 855D?
Yes. The manual carries the general and detailed engine specifications and the service procedures for both machines, including the engine, fuel injection, undercarriage, power train, and hydraulic sections that apply to the 850D and 855D.
Does it include the final drive and undercarriage repairs?
Yes, and those are the sections owners reach for most. The manual details the final drive service that addresses the known dowel pin and shock absorber failures, plus track, idler, roller, sprocket, and track adjuster service in the Undercarriage section.
What engine is in the 850D and 855D and is this the genuine factory manual?
They run the Case 590 series six cylinder diesel, offered as the 6-590 naturally aspirated, 6T-590 turbocharged, and 6TA-590 turbo aftercooled. This is the Case factory service manual in searchable, printable PDF that downloads instantly after purchase.
What format is this Case 850D, 855D manual in?
Immediate download of the complete 1422-page searchable Service Manual (746 MB). Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this Case 850D, 855D manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this Case 850D, 855D manual include hydraulic schematics?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Case 850D, 855D.
