Case 1850K Crawler Dozer Service Manual PDF

This workshop service manual covers the Case 1850K Crawler Dozer. It provides detailed technical information on the machine's major systems, including engine, transmission, final drives, brakes, steering, undercarriage, hydraulic equipment, and electrical systems. The manual explains system operation and includes service specifications, troubleshooting guidance, inspection procedures, and step-by-step repair instructions supported by technical diagrams and illustrations.

The procedures are intended for qualified service personnel performing maintenance, diagnostics, adjustments, component removal, disassembly, overhaul, and reassembly. Follow the manufacturer's instructions and observe all specified safety precautions and tightening torques.

Service and Repair Coverage

The manual includes general technical information, machine dimensions, operating weights, component weights, stability data, fluid specifications, troubleshooting guidance, and tightening torque tables. It also provides identification and technical data to support accurate servicing and repair work.

The engine section covers general specifications, Series C engine data, engine diagrams, engine mounting, and throttle linkage. The transmission section explains the torque converter and transmission operation, hydraulic diagrams, pressure testing, troubleshooting, gear-shifting controls, and repair procedures. Detailed instructions are provided for removing, disassembling, inspecting, overhauling, and reinstalling the torque converter and transmission components, including clutch assemblies, modulating valves, and pressure relief valves.

The final drive section covers component descriptions, exploded and sectional views, removal and disassembly procedures, bearing replacement, seal installation, assembly, and fitting specifications.

The brakes and steering section provides hydraulic circuit diagrams, component descriptions, diagnostic information, pressure testing, brake pedal adjustment, and valve testing procedures. It also covers repair and overhaul of the brake and steering differential, planetary components, brake assemblies, bevel gear set, and related bearing and gear adjustments.

The undercarriage section includes inspection and adjustment of track chains, track tensioner pressure settings, and repair procedures for track chains, idlers, support rollers, and bottom rollers. Technical specifications and wear limits are provided for the main undercarriage components.

The dozing equipment hydraulic system section explains hydraulic system operation, circuit diagrams, flow testing, and repair procedures. It covers the hydraulic oil reservoir, equipment hydraulic pump, control valve, blade installation, lifting and tilt cylinders, ripper cylinder, push arms, rods, and ripper linkage.

The electrical system section covers electrical safety, protection circuits, fuses, main switches, starting circuits, backup alarm, starter motor, instrument panel, monitor, sensors, display, buzzer, relays, diodes, connectors, and the complete electrical wiring diagram.

This manual is a technical reference for diagnosing faults, performing repairs, servicing individual components, and maintaining the Case 1850K Crawler Dozer.

Table of Contents: 

SECTION 0
GENERALITIES
TABLE OF CONTENTS
SAFETY RULES
TABLE OF TECHNICAL DATA
Table of fluids used
Main dimensions
Technical data tables
CONTROL DATA ON THE MACHINE
TABLE OF WEIGHTS
LIST OF WEIGHTS FOR MAIN SERVICE COMPONENTS
STABILITY
GENERAL INSTRUCTIONS
TROUBLESHOOTING
UNITS OF MEASURE
TABLE OF TIGHTENING TORQUES

SECTION 1
ENGINE
TABLE OF CONTENTS
1.1 GENERAL SPECIFICATIONS
1.2 SERIES "C" ENGINE DATA
1.3 DIAGRAMS OF SERIES "C" ENGINE
1.4 MOUNTING OF ENGINE ON FRAME
1.5 THROTTLE LINKAGE

SECTION 2
TRANSMISSION
TABLE OF CONTENTS
2.1 GENERAL DESCRIPTION
2.1.1 - Transmission torque converter hydraulic diagram
- Transmission housing/propeller shaft/torque converter
  2.2 TROUBLESHOOTING
  2.3 TESTS
  2.3.1 - Torque converter stall test
  2.3.2 - Delivery pressure test procedure
  2.3.3 - Transmission gearshifting electric control valve
  2.4 PROCEDURES FOR THE REPAIR OF THE TORQUE CONVERTER
  2.4.1 - Removal
  2.4.2 - Re-Installation
  2.4.3 - Disassembly
  2.4.4 - Reassembly
  2.5 PROCEDURES FOR THE REPAIR OF THE TRANSMISSION
  2.5.1 - Removal
  2.5.2 - Re-Installation
  2.5.3 - Disassembly
  2.5.4 - Overhaul of the forward speed clutch
  2.5.5 - Overhaul of the 3rd speed clutch
  2.5.6 - Overhaul of the reverse speed clutch
  2.5.7 - Modulating valves (disassembly/assembly)
  2.5.8 - Pressure relief valve (disassembly/assembly)
  2.6 SPECIFICATIONS AND DATA
  2.6.1 - General data
  2.6.2 - Tightening torques (Torque converter)
- Transmission housing
  2.6.3 - Transmission Data
- Transmission Clutch
- Transmission clutch discs
- 1st - 2nd - 3rd speed Transmission Clutch modulating valves
- Lube oil pressure relief valve
- Forward/reverse modulating valves
- Transmission pressure relief and torque converter safety valve
- Torque converter - transmission feeding pump
- Oil filters
  
SECTION 3
  FINAL DRIVES
  TABLE OF CONTENTS
  3.1 GENERAL DESCRIPTION
  3.1.1 Final drive (Exploded view and sectional view)
  3.2 REPAIR PROCEDURES
  3.2.1 Final drive (removal / disassembly)
  3.2.2 Pulling the housing cover
  3.2.3 Driven gear (bearing removal)
  3.2.4 Driving gear shaft (bearing removal)
  3.2.5 Description of installation of front seals (long life)
  3.2.6 Final drive (assembly)
  3.3 SPECIFICATIONS AND DATA
  3.3.1 Final drive shaft and bearing fittings

SECTION 4
BRAKES AND STEERING
TABLE OF CONTENTS
CHAPTER
SUBJECT
4.1 GENERAL DESCRIPTION
4.1.1 Brakes hydraulic diagram
4.1.2 Brake circuit main components
Brake powering pump
Brake powering valve block
Brake pedal valve
Brake oil filter
4.1.3 Steering hydraulic circuit diagram
4.1.4 Steering circuit main components
Hydraulic motor
Steering piloting valve block
4.2 TROUBLESHOOTING
4.2.1 Diagnosis on the display
4.3 TESTS
4.3.1 Circuit test pressures on diagnostics
4.3.2 Brake pedal adjustment
4.3.3 Test and setting of brake powering valve block
4.4 REPAIR PROCEDURES
4.4.1 Brake pedal valve (removal / disassembly)
4.4.2 Brake power pump
4.4.3 Brakes and steering differential
4.4.4 Removal (preliminary operations)
Removal of the ring gear
Disassembly of the planet carrier differential assembly
Disassembly of the sun gear
Disassembly of the brake assembly
Re-assembly of the brake drum assembly
Check and inspection of brake packs
Re-assembly of the sun gear
Re-assembly of the planet carrier assembly
Re-assembly and re-installation of the ring gear assembly
Re-installation of brake/steering differential group into the transmission housing
4.4.5 Bevel gear set (Removal/disassembly of pinion and bevel gear)
4.4.6 Procedure for the setting of the bevel pinion bearings pre-load
4.4.7 Procedure for the setting of the bevel gear crown
4.4.8 Re-installation of housing cover
4.5 SPECIFICATIONS AND DATA
4.5.1 Bevel gear reduction unit (general data/dimensions)
4.5.2 Brakes
4.5.3 Brake pedal valve

SECTION 5
UNDERCARRIAGE
TABLE OF CONTENTS
CHAPTER
SUBJECT
5.1 GENERAL DESCRIPTION
5.1.1 Generalities
5.1.2 Main components
5.2 TROUBLESHOOTING
5.3 INSPECTIONS
5.3.1 Inspection and adjustment of track chains
5.3.2 Setting of track tensioner pressure relief valve
5.4 REPAIR PROCEDURES
5.4.1 Track chain (removal / installation)
5.4.2 Replacing a damaged link and re-installation
5.4.3 Idler (removal / Re-installation / overhaul)
5.4.4 Track chain support rollers (removal / installation / overhaul)
5.4.5 Track chain bottom rollers (removal / installation / overhaul)
5.5 SPECIFICATIONS AND DATA
5.5.1 Idler
5.5.2 Sprockets
5.5.3 Track chains
5.5.4 Bottom rollers
5.5.5 Support rollers
5.5.6 Track tensioner device
5.5.7 Front cross-member pivots
5.5.8 Wear limits

SECTION 6
DOZING EQUIPMENT HYDRAULIC SYSTEM
TABLE OF CONTENTS
CHAPTER
SUBJECT
6.1 GENERAL DESCRIPTION
6.1.1 Operation of the hydraulic system
6.1.2 Diagram equipment hydraulic system diagram
6.2 TESTS
6.2.1 Use of the flow meter
6.2.2 Flow test in single circuits
6.3 REPAIR PROCEDURES
6.3.1 Hydraulic oil reservoir
6.3.2 Equipment hydraulic pump
6.3.3 Hydraulic control valve
6.3.4 Installation of blade
6.4 SPECIFICATIONS AND DATA
6.4.1 Hydraulic control valve
6.4.2 Hydraulic power pump
6.4.3 Blade lifting cylinder ball joint
6.4.4 Blade lifting control cylinder
6.4.5 Blade Tilt control cylinder (Bulldozer version)
6.4.6 Blade Tilt control cylinder (Angledozer version)
6.4.7 Ripper cylinder
6.4.8 Blade push arms and rods
6.4.9 Ripper linkage

SECTION 7
ELECTRICAL SYSTEM
TABLE OF CONTENTS
SUBJECT
Safety rules
Electrical diagram of protections tree
Fuses
Link fuses and cold starting fuse
Main switch
Engine starting switch
Back-up alarm
Starter motor
Instrument panel/monitor
Monitor senders
Display
Buzzer
Relays - diodes - diverter box group
Main connectors 19 - 21 - 23 ways
Electrical system diagram

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