John Deere 844J 4WD Loader Operation & Test Service Manual (TM2306) PDF - MJODTM2306.zip
A full Operation and Test guide paired with Electrical Wiring Diagrams for the John Deere 844J 4WD Loader, containing shop-level details to service, troubleshoot, and overhaul the machine the way professional technicians do.
The Operation and Test service manual for the John Deere 844J 4WD Loader covers the following:
* 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