Complete service Operation and Test manual with Electrical Wiring Diagrams for John Deere 344G and 444G 4WD Loader (SN. before 22913), with all the shop information to maintain, diagnose, and rebuild like professional mechanics.

John Deere 4WD Loader Model 344G and 444G workshop Diagnosis 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.

TM1557 - John Deere 4WD Loader Model 344G and 444G Technical Manual - Operation and Test.PDF
TM1557 - John Deere 4WD Loader Model 344G and 444G Technical Manual - Operation and Test.epub

Total Pages: 656 pages
File Format: PDF/EPUB/MOBI/AZW (PC/Mac/Android/Kindle/iPhone/iPad; bookmarked, ToC, Searchable, Printable)
Language: English

MAIN SECTIONS
  Foreword
   General Information
      Safety
      General Specifications
      Torque Values
      Fuels And Lubricants
   Operational Checkout Procedure
      Operational Checkout Procedure
   Engine
      Theory Of Operation
      System Operational Checks
      Diagnostic Information
      Adjustment
      Tests
   Electrical System
      System Information
      System Diagrams
      Sub-System Diagnostics
   Power Train
      Theory Of Operation
      System Operational Checks
      Diagnostic Information
      Adjustments
      Tests
   Hydraulic System
      Theory Of Operation
      System Operational Checks
      Diagnostic Information
      Adjustments
      Tests

tm1557 - 344g, 444g loader operation and test

Table of Contents

Foreword

Section 9000: General Information

Group 01: Safety

Handle Fluids Safely-Avoid Fires

Prevent Battery Explosions

Prepare for Emergencies

Prevent Acid Burns

Handle Chemical Products Safely

Avoid High-Pressure Fluids

Park Machine Safely

Support Machine Properly

Wear Protective Clothing

Work in Clean Area

Service Machines Safely

Work In Ventilated Area

Illuminate Work Area Safely

Replace Safety Signs

Use Proper Lifting Equipment

Remove Paint Before Welding or Heating

Avoid Heating Near Pressurized Fluid Lines

Keep ROPS Installed Properly

Service Tires Safely

Avoid Harmful Asbestos Dust

Practice Safe Maintenance

Use Proper Tools

Dispose of Waste Properly

Live With Safety

Group 02: General Specifications

344G Loader

344G Loader Operating Information

Loader Specifications-344G

Drain And Refill Capacity-344G

444G Loader

444G Loader Operating Information

Loader Specifications-444G

Drain And Refill Capacities-444G

Group 03: Torque Values

Hardware Torque Specifications

ROPS Torque Specifications

Metric Bolt and Cap Screw Torque Values

Additional Metric Cap Screw Torque Values

Unified Inch Bolt and Cap Screw Torque Values

Check Oil Lines And Fittings

Service Recommendations for 37° Flare and 30° Cone Seat Connectors

Service Recommendations for O-Ring Boss Fittings

Service Recommendations for Flat Face O-Ring Seal Fittings

Service Recommendations For Inch Series Four Bolt Flange Fittings

Service Recommendations for Metric Series Four Bolt Flange Fitting

Group 04: Fuels And Lubricants

Fuel Specifications

Low Sulfur Diesel Fuel Conditioner

Storing Fuel

Do Not Use Galvanized Containers

Fuel Tank

Engine Oil

Power Shift (HI-LO) Transmission And Brake System Oil

Hydraulic/Hydrostatic System Oil

Differential Oil

Grease

Alternative and Synthetic Lubricants

Lubricant Storage

Mixing of Lubricants

Engine Coolant

Section 9005: Operational Checkout Procedure

Group 10: Operational Checkout Procedure

Operational Checkout Record Sheet

Complete Machine Operational Checkout

Section 9010: Engine

Group 05: Theory Of Operation

4045 John Deere Engine-Use CTM8

Alternators And Starting Motors-Use CTM77

General Engine Description

Engine-Sectional View

Group 10: System Operational Checks

Engine Operational Checks

Group 15: Diagnostic Information

Diagnose Engine Malfunctions

Group 20: Adjustment

Fan Belt Tension Adjustment

Engine Speed Adjustment

Engine Speed Control Linkage Adjustment

Group 25: Tests

JT05801 Clamp-On Electronic Tachometer Reader Installation Procedure

JT05800 Digital Thermometer Installation

Air Filter Restriction Indicator Switch Test

Air Intake System Leakage Test

Radiator Air Flow Test

Engine Performance Test Using Engine Pulldown

Fuel Line Leakage Test

Section 9015: Electrical System

Group 05: System Information

Visually Inspect Electrical System

Electrical Circuit Malfunctions

High Resistance Circuit

Open Circuit

Grounded Circuit

Shorted Circuit

Multimeter

Seven Step Electrical Test Procedure

Wiring Diagram And Schematic Information

Reading A System Functional Schematic

Reading A Wiring Diagram

Electrical Schematic Symbols

Group 10: System Diagrams

Component Identification Table

Replacing Fuses

Fuse (Blade-Type) Color Codes

Fuse Specifications

Wiring And Schematic Diagrams Legend

System Functional Schematic Section Legend

System Functional Schematic

Front Console Harness (W5) Wiring Diagram

Front Console Harness (W5) Component Location

Side Console Harness (W6) Wiring Diagram

Side Console Harness (W6) Component Location

Rear Frame Harness (W7) Wiring Diagram

Rear Frame Harness (W7) Component Location

Engine Harness (W8) Wiring Diagram

Engine Harness (W8) Component Location

Cab Harness (W9) Wiring Diagram

Cab Harness (W9) Component Location

Front Frame/Center Pin Harness (W10) Wiring Diagram

Front Frame/Center Pin Harness (W10) Component Location

Group 15: Sub-System Diagnostics

Power Circuit Theory Of Operation

Power Circuit Schematic

Starting Circuit Theory Of Operation

Starting Circuit Schematic

Start Aid And Fuel Shut-Off Circuit Theory Of Operation

Start Aid And Fuel Shut-Off Schematic

Switch And Sender Specifications

Monitor Circuit Theory Of Operation

Monitor Circuit Schematic

Secondary Steering Circuit Theory Of Operation

Secondary Steering Circuit Schematic

Secondary Steering Circuit Diagnostic Procedures

Turn Signal/Flasher Circuits Theory Of Operation

Turn Signal/Flasher Circuit Schematic

Park Brake Switch Specification

Park Brake Circuit Theory Of Operation

Park Brake Circuit Schematic

FNR/Reverse Warning Circuits Theory Of Operation

FNR/Reverse Warning Circuit Schematic

Transmission Circuit Theory Of Operation

Transmission Circuit Schematic

Light/Dimmer/Radio Circuit Theory Of Operation

Light/Dimmer/Radio Circuit Schematic

Ride Control Circuit Theory Of Operation

Ride Control Circuit Schematic

Boom Kickout/Return-To-Dig Circuit Theory Of Operation

Boom Kickout/Return-To-Dig Circuit Schematic

Boom Kickout/Return-To-Dig Circuit Diagnostic Procedures

Boom Kickout/Return-To-Dig Circuit Diagnostic Procedures-Continued

Front Drive And Turn Light Circuit Theory Of Operation

Front Drive And Turn Light Circuit Schematic

Front And Rear Wiper/Washer Circuit Theory Of Operation

Front And Rear Wiper/Washer Circuit Schematic

Heater Blower Circuit Theory Of Operation

Heater Blower Circuit Schematic

Air Conditioner/Heater Circuit Theory Of Operation

Air Conditioner/Heater Circuit Schematic

License/Turn/Tail/Brake Light Circuit Theory Of Operation

License/Turn/Tail/Brake Light Circuit Schematic

Front And Rear Work Lights

Front And Rear Work Light Circuit Schematic

Diff Lock/Pin Disconnect/Dome Light Circuit Theory Of Operation

Diff Lock/Pin Disconnect/Dome Light Circuit Schematic

Horn Circuit Theory Of Operation

Horn Circuit Schematic

Section 9020: Power Train

Group 05: Theory Of Operation

Power Train Operation

Brake Circuit Operation

Brake Valve Operation

Brake Booster Operation-Brakes Applied

Transmission And Brake Pump

Transmission/Brake Filter Operation

Park Brake Operation

Transmission Pressure Regulating Valve And Lube Relief Valve

High-Low Transmission Components

High-Low Transmission-Low Range

High-Low Transmission-High Range

High-Low Transmission Control Valve

High-Low Transmission Hydraulic Circuit High Range Before Shift

High-Low Transmission Hydraulic Circuit Low Range After Shift

Transmission Low Range

Transmission High Range-Shift Initiated

Transmission High Range-Modulation Starting

Transmission High Range-Shift Completed

Hydrostatic Circuit Schematic

Hydrostatic Charge Pump Operation

Hydrostatic Charge Filter Operation

Hydrostatic Pump Operation

Control Pressure Starting Point Valve Operation

Control Pressure Regulating Valve And Regulating Orifice Operation

Forward, Neutral, And Reverse (FNR) Solenoid Valve Operation

Neutral Dump Solenoid Valve Operation

Neutral Dump Valve Operation

Neutral Dump Valve (Forward Or Reverse) Operation

Pressure Override Valve Operation-Valve Closed

Pressure Override Valve Operation-Valve Open

Inching Orifice Operation

Acceleration Check Valve And Orifice Operation

Hydrostatic Motor Operation

Flushing Valve And Motor Displacement Shuttle Valve Operation

Motor Displacement Control Valve (High Closed Loop Pressure) Operation

Motor Displacement Control Valve (Low Closed Loop Pressure) Operation

High Pressure Relief Valve Operation

Control Pressure Bypass Valve Operation

Differential Lock Operation

Differential Assembly Operation

Final Drive Operation

Group 10: System Operational Checks

Power Train Operational Checks

Group 15: Diagnostic Information

Diagnose Transmission Malfunctions

Diagnose Differential/Axle Malfunctions

Diagnose Drive Line Malfunctions

Diagnose Service Brake Malfunctions

Diagnose Park Brake Malfunctions

Brake And Hi/Low Transmission Schematic

Transmission/Brake/Differential Component Location

HST Schematic

HST Circuit (Forward At Low Speed-Low Load)

HST Transmission Component Location

Group 20: Adjustments

Park Brake Adjustment

Brake Pedal And Inching Pedal Linkage Adjustment

Brake Pad Inspection

Bleed Brake Hydraulic System

Front Axle Disconnect Cable Adjustment

Group 25: Tests

Hydrostatic (HST) Warm-Up Procedure

Complete System Test

HST Charge Pump Flow Test

Neutral Charge Relief And Operating Charge Orifice Tests

Control Pressure And Starting Point Valve Test

Pressure Override (POR) Valve Test

High Pressure Relief Valve Test

Motor Displacement Control Valve Test

Neutral Dump Valve Test

Control System Test

Volumetric Efficiency Test

HST Start-Up Procedure

HI-LO Transmission Warm-Up Procedure

Hi-Lo Transmission System Pressure, Element Leakage, And Modulation Tests

HI-LO Transmission Pump Flow Test

HI-LO Transmission Lubrication Pressure Test

Hi-Lo Transmission Cooler Bypass And Lube Relief Valve Test

Brake Booster Pressure Test

Differential Lock Pressure Test

Differential Lock Leakage Test

Section 9025: Hydraulic System

Group 05: Theory Of Operation

Steering And Loader Hydraulic System Operation

Steering Circuit Operation

Priority Valve Operation

Steering Valve Operation

Cylinder Operation

Secondary Steering System Operation-If Equipped

Secondary Steering Inlet Manifold Operation-If Equipped

Steering And Loader Pump Operation

Loader Control Valve Operation

Loader Control Valve Operation-Boom Section

Boom Height Kickout Detent Operation

Loader Control Valve Operation-Bucket Section

Bucket Section Return-To-Dig Detent Operation

Loader Control Valve Operation-Auxiliary Section

System And Circuit Relief Valve Operation

Hydraulic Oil Filter Operation

Group 10: System Operational Checks

Hydraulic Operational Checks

Group 15: Diagnostic Information

Diagnose Hydraulic System Malfunctions

Diagnose Steering System Malfunctions

Hydraulic Circuit Symbols

Steering And Loader Hydraulic Component Location

Hydraulic Circuit Schematic Diagram

Group 20: Adjustments

Hydraulic Oil Cleanup Procedure Using Portable Filter Caddy

Return-To-Dig Adjustment

Boom Height Kickout Adjustment

Group 25: Tests

JT05801 Clamp-On Electronic Tachometer Installation

JT05800 Digital Thermometer Installation

Hydraulic Oil Warm-Up Procedure

Loader System And Circuit Relief Valve Pressure Test

Hydraulic Pump Flow Test

Priority Valve Pressure Test-Maximum Steering System Pressure

DF1035 Isolator Test Plate

Steering System Leakage Test

Priority Valve Relief Cartridge Leakage Test

Priority Valve “LS” Port Flow Test

Steering Valve Leakage Test

Loader Cylinder Drift Test

Boom Cylinder Leakage Test

Bucket Cylinder Leakage Test

Secondary Steering Pump Relief Valve Pressure Test-If Equipped

Secondary Steering Manifold Block Primary Check Valve Leakage Test-If Equipped

Secondary Steering Manifold Block Secondary Check Valve Leakage Test-If Equipped

Cycle Time Test

Steering Stop Wear Check

John Deere 4WD Loader Model 344G and 444G Operation and Test Service Manual (TM1557)