Complete Operation and Test manual with Electrical Wiring Diagrams for John Deere 4WD Loader 844J, with workshop information to maintain, diagnose, and rebuild like professional mechanics.

John Deere 4WD Loader 844J workshop Operation and Test manual includes:
* Numbered table of contents easy to use so that you can find the information you need fast.
* Detailed sub-steps expand on repair procedure information
* Numbered instructions guide you through every repair procedure step by step.
* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.

TM2306 - John Deere 4WD Loader 844J Technical Manual (Operation and Test).PDF

Total Pages: 761 pages
File Format: PDF (bookmarked, ToC, Searchable, Printable, high quality)
Language: English

MAIN SECTIONS
Foreword
   General Information
      Safety Information
   Operational Checkout Procedure
      Operational Checkout Procedure
   Engine
      Theory Of Operation
      Diagnostic Information
      Tests
   Electrical System
      System Information
      System Diagrams
      Sub-System Diagnostics
      References
   Power Train
      Theory Of Operation
      Diagnostic Information
      Adjustments
      Tests
   Hydraulic System
      Theory Of Operation
      Diagnostic Information
      Adjustments
      Tests
   Heating And Air Conditioning System
      Theory Of Operation
      Diagnostic Information
      Tests
   Dealer Fabricated Tools 

tm2306 - 844J Loader

Table of Contents

Foreword

Section 9000: General Information

Group 01: Safety Information

Recognize Safety Information

Follow Safety Instructions

Operate Only If Qualified

Wear Protective Equipment

Avoid Unauthorized Machine Modifications

Add Cab Guarding For Special Uses

Inspect Machine

Stay Clear of Moving Parts

Avoid High-Pressure Oils

Beware of Exhaust Fumes

Prevent Fires

Prevent Battery Explosions

Handle Chemical Products Safely

Dispose of Waste Properly

Prepare for Emergencies

Use Steps and Handholds Correctly

Start Only From Operator's Seat

Use and Maintain Seat Belt

Prevent Unintended Machine Movement

Avoid Worksite Hazards

Use Special Care When Operating Loader

Keep Riders Off Machine

Avoid Backover Accidents

Avoid Machine Tip Over

Operating on Slopes

Operating or Traveling On Public Roads

Inspect and Maintain ROPS

Add and Operate Attachments Safely

Park And Prepare For Service Safely

Service Cooling System Safely

Remove Paint Before Welding or Heating

Make Welding Repairs Safely

Drive Metal Pins Safely

Section 9005: Operational Checkout Procedure

Group 10: Operational Checkout Procedure

Operational Checkout Procedure

Section 9010: Engine

Group 05: Theory Of Operation

POWERTECH POWERTECH is a trademark of Deere & Company 12.5L (6125) John Deere Engines

Fast Fill Fuel System Theory of Operation

Wait to Start / Start Inhibit Theory of Operation

Engine Air Heater Theory of Operation

Pilot Injection Theory Of Operation

Group 15: Diagnostic Information

POWERTECH POWERTECH is a trademark of Deere & Company 12.5L (6125) John Deere Engines

Diagnose Observable Machine Symptoms—Level 6 Electronic Fuel Systems With Lucas EUIs

Diagnose Fast Fill System Malfunctions

Cooling System Component Location

Fuel System Component Location

Group 25: Tests

Engine Speed Test

Intake Manifold Pressure Test—Turbocharger Boost

Section 9015: Electrical System

Group 05: System Information

Electrical Diagram Information (S.N. —165691)

Group 10: System Diagrams

Fuse and Relay Specifications

System Functional Schematic, Wiring Diagram and Component Location Master Legend

System Functional Schematic

JDLink™ System Functional Schematic—MIG/GTT

JDLink™ System Functional Schematic—MTG/SAT

Loader Frame Harness (W2) Component Location

Loader Frame Harness (W2) Wiring Diagram

Load Center Harness (W3) Component Location

Load Center Harness (W3) Wiring Diagram

Front Console Harness (W4) Component Location

Front Console Harness (W4) Wiring Diagram

Engine Frame Harness (W5) Component Location

Engine Frame Harness (W5) Wiring Diagram

Engine Harness (W6) Component Location

Engine Harness (W6) Wiring Diagram

Engine Air Heater Harness (W7) Component Location

Engine Air Heater Harness (W7) Wiring Diagram

Joystick Steering Harness (W8) Component Location

Joystick Steering Harness (W8) Wiring Diagram

Transmission Harness (W10) Component Location

Transmission Harness (W10) Wiring Diagram

Rear Frame Harness (W13) Component Location

Rear Frame Harness (W13) Wiring Diagram

Cab Roof Harness (W19) Component Location

Cab Roof Harness (W19) Wiring Diagram

Blower and A/C Harness (W20) Component Location

Blower and A/C Harness (W20) Wiring Diagram

JDLink™ System Harnesses Component Location—MIG/GTT

JDLink™ System Harnesses Component Location—MTG/SAT

JDLink™ System Wiring Diagrams—MIG/GTT

JDLink™ System Wiring Diagrams—MTG/SAT

Radio Harness (W34) Component Location

Radio Harness (W34) Wiring Diagram

Group 15: Sub-System Diagnostics

Starting and Charging Circuit Theory of Operation

Controller Area Network (CAN) Theory of Operation

Engine Control Unit (ECU) Circuit Theory of Operation

Flex Load Controller (FLC) Circuit Theory of Operation

Transmission Control Unit (TCU) Circuit Theory of Operation

CAN Monitor Unit (CMU) Circuit Theory of Operation

Group 20: References

Diagnostic Trouble Code Quick Reference

CAN Monitor Unit (CMU) Diagnostic Trouble Codes

Flex Load Controller (FLC) Diagnostic Trouble Codes

Sealed Switch Module (SSM) Diagnostic Trouble Codes

Transmission Control Unit (TCU) Diagnostic Trouble Codes

Engine Control Unit (ECU) Diagnostic Trouble Codes

Joystick Steering Valve (JSV) Diagnostic Trouble Codes

Joystick Steering Controller (JSC) Diagnostic Trouble Codes

Flex Load Controller (FLC) Fault Exceptions

JDLink™ System Identification

JDLink™ Connection Procedure

Alternator Test

Transmission Control Unit (TCU) Calibration

CAN Circuit Testing

Electrical Component Specifications

Transmission Control Valve Solenoid Check

Clutch Cut-Off Sensor Check and Adjustment

Boom Height Kickout and Return-to-Carry Adjustment

Return-To-Dig Adjustment

Sensor Circuitry Check

Transmission Speed Sensor Adjustment

Change Back-Up Alarm Volume

Remove and Install Pressure Switches

Reprogram CAN Monitor Unit (CMU)

Machine Option Reconfiguration

Replace (Push Type) METRI-PACK METRI-PACK is a trademark of Packard Electric Inc. Connectors

Replace (Pull Type) METRI-PACK METRI-PACK is a trademark of Packard Electric Inc. Connectors

Install METRI-PACK Metri-Pack is a trademark of Packard Electric. Contact

Replace DEUTSCH DEUTSCH is a trademark of the Deutsch Co. Connectors

Install DEUTSCH DEUTSCH is a trademark of the Deutsch Co. Contact

Replace WEATHER PACK WEATHER PACK is a trademark of Packard Electric. Connector

Install WEATHER PACK WEATHER PACK is a trademark of Packard Electric. Contact

Replace CINCH CINCH is a trademark of the Cinch Co. Connectors

Install CINCH CINCH is a trademark of the Cinch Co. Contact

Repair 32 and 48 Way CINCH CINCH is a trademark of the Cinch Co. Connectors

Remove Connector Body from Blade Terminals

Section 9020: Power Train

Group 05: Theory Of Operation

Power Train System Operation

Transmission Operation

Transmission Operation—First Gear Forward

Torque Converter Operation

Transmission Clutch Engagement and Solenoids Activated

Clutch Pack Operation

Transmission Clutch Modulation

Transmission Hydraulic System

Transmission Pump Operation

Transmission Control Valve Components

Thermal Bypass Valve Operation

Differential Operation—Conventional

Differential Operation—Limited Slip

Axle Planetary Gearcase, Service Brake and Axle Cooling Operation

Park Brake Operation

Group 15: Diagnostic Information

Diagnose Transmission Malfunctions

Diagnose Differential and Axle Malfunctions

Diagnose Service Brake Malfunctions

Diagnose Drive Line Malfunctions

Diagnose Park Brake Malfunctions

Transmission System Schematic—First Forward

Transmission Component Location

Power Train Component Location

Group 20: Adjustments

External Service Brake Inspection

Service Brake Bleeding Procedure

Group 25: Tests

Transmission Oil Warm-Up Procedure

Park Brake Pressure Test

Park Brake Drag Test

Transmission Pump Flow Test

Transmission System Pressure Test

Transmission Clutch Pressure Test

Transmission Element Leakage Test

Lube Pressure Test

Torque Converter Stall and Engine Pulldown Test

Torque Converter—In Pressure Test

Torque Converter—Out Pressure Test

Torque Converter Relief Pressure Test

Torque Converter—Out Flow Test

Transmission Oil Cooler Thermal Bypass Valve Temperature Test

Transmission Oil Cooler Thermal Bypass Valve Pressure Test

Transmission Oil Cooler Restriction Test

Axle Circulation Pump Temperature and Flow Test

Section 9025: Hydraulic System

Group 05: Theory Of Operation

Hydraulic System Overview

Hydraulic Pump Operation

Hydraulic System Manifold Operation

Steering Hydraulic System

Orbital Steering Valve Operation

Orbital Steering Priority Valve Operation

Orbital Steering Operation

Joystick Steering Valve

Joystick Steering Operation

Secondary Steering Operation

Loader Hydraulic System

Loader Control Valve Operation

Boom Section Operation

Loader Control Valve—Load Sense Circuit

Anticavitation Valve Operation

Pilot Control Lever Operation

Pilot Orifice Check Valve For Control Valve Sections

Service Brake Hydraulic System

Service Brake Valve

Service Brake Accumulator

Fan Pump Operation

Fan Operation

Hydraulic Return System

Return Filter Operation

Ride Control Operation

Pin Disconnect Operation

Group 15: Diagnostic Information

Hydraulic System Schematic—Neutral (S.N. —612883)

Hydraulic System Schematic—Neutral (S.N. 612884— )

Hydraulic System Component Location

Diagnose Hydraulic System Malfunctions

Group 20: Adjustments

Return-To-Dig Adjustment

Return-To-Carry and Boom Height Kickout Adjustment

Pilot Controller Adjustment—Two Lever Pilot

Ride Control Accumulator Discharge Procedure

Ride Control Accumulator Gas Charge Procedure—If Equipped

Ride Control Accumulator Draining Procedure

Group 25: Tests

Hydraulic Oil Warm-Up Procedure

Discharge Hydraulic System Pressure and Accumulators

JT02156A Digital Pressure and Temperature Analyzer Kit Installation

Pump 1 - Pump Displacement Control Valve Test

Pump 2 / Pump 3—Pump Displacement Control Valve Test

Pump 2 and Pump 3 Maximum Operating Pressure Test

Hydraulic Pump 1 Flow Test

Hydraulic Pump Flow Test—Pump 2 and Pump 3

Hydraulic Pump Case Drain Test—Pump 1 / Pump 2 / Pump 3

Loader System Relief Valve And Circuit Relief Valve Pressure Tests

Pressure Reducing Valve (Pilot Pressure) Test

Loader Cylinder Drift Test

Boom And Bucket Cylinder Leakage Test

Service Brake Valve Pressure Test

Service Brake Valve Leakage Test

Service Brake Accumulator Precharge Test

Service Brake Accumulator Inlet Check Valve Leakage Test

Boom Down Accumulator Precharge Test

Pilot Control Valve Pressure Test—Two Lever (Fingertip)

Pilot Control Valve Pressure Test—Single Lever

Priority Valve Performance Test

Orbital Steering Valve Leakage Test

Orbital Steering Valve Drift Test

Orbital Steering Cycle Time Test

Orbital Steering Priority Valve Port LS Flow Test

Joystick Steering Valve Pressure Test

Joystick / Orbital Steering Priority Test

Joystick Steering Circuit Relief Valve Test

Joystick Steering Cycle Time Test

Secondary Steering Manifold Leakage Test

Secondary Steering Function Valve Test

Secondary Steering Pressure Relief Valve Test

Fan Pump Displacement Control Valve Test

Fan Pump Flow Test

Fan Pump Case Drain Test

Fan Motor RPM Test

Hydraulic Oil Cooler Restriction Test

Pin Disconnect Pressure Test

Hydraulic Oil Filter Inspection Procedure

Section 9031: Heating And Air Conditioning System

Group 05: Theory Of Operation

Air Conditioning System Cycle Of Operation

Group 15: Diagnostic Information

Diagnose Air Conditioning System Malfunctions

Diagnose Heater System Malfunctions

Air Conditioner and Heater System Component Location

Group 25: Tests

Refrigerant Cautions and Proper Handling

Air Conditioner and Heater Operational Checks

Refrigerant Leak Test

Air Conditioner Compressor Clutch Test

Air Conditioner High/Low Pressure Switch Test

Air Conditioner Freeze Control Switch Test

R134a Air Conditioning System Test

Operating Pressure Diagnostic Chart

Section 9900: Dealer Fabricated Tools

Group 9900: Dealer Fabricated Tools

DFT1241—Service Brake Inspection Tool

John Deere 4WD Loader 844J Operation and Test Service Manual (TM2306)