Complete Operation and Test manual with Electrical Wiring Diagrams for John Deere 4WD Loader 304H, with technical information to maintain, diagnose, and service like professional mechanics.

John Deere 4WD Loader 304H Diagnostic 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.

TM1863 English - John Deere 304H 4WD Loader Technical Manual (Operation and Test).PDF
tm10198 French - Chargeuse 304H Fonctionnement et tests.pdf
ctm119 - POWERTECH 0.9, 1.1, 1.2, 1.3, 1.5, 1.6 &2.0 L and Yanmar 4TNE98 Diesel Engines
ctm3 English - John Deere Series 220 Diesel Engines CTM
ctm55 Italian - Motori Diesel Yanmar Serie 3TN e 4TN CTM

Total Pages: 789 pages
File Format: PDF (bookmarked, ToC, Searchable, Printable, high quality)
Language: English

MAIN SECTIONS
  Foreword
   General Information
      Safety Information
      General Specifications
      Torque Values
      Fuels and Lubricants
   Operational Checkout Procedure
      Operational Checkout Procedure
   Engine
      Theory of Operation
      Diagnostic Information
      Adjustments
      Tests
   Electrical System
      System Information
      System Diagrams
      Sub-System Diagnostics
      References
      Adjustments
   Power Train
      Theory Of Operation
      Diagnostic Information
      Adjustments
      Tests
   Hydraulic System
      Theory Of Operation
      Diagnostic Information
      Adjustments
      Test
   Heating and Air Conditioning
      Theory of Operation
      Diagnostic Information
      Adjustments
      Tests

TABLE OF CONTENTS
Section 9000: General Information...14
  Group 01: Safety Information...14
    Handle Fluids Safely—Avoid Fires...17
    Prevent Battery Explosions...18
    Prepare for Emergencies...19
    Prevent Acid Burns...20
    Handle Chemical Products Safely...22
    Avoid High-Pressure Fluids...23
    Park Machine Safely...24
    Support Machine Properly...25
    Wear Protective Clothing...26
    Work in Clean Area...27
    Service Machines Safely...28
    Work In Ventilated Area...29
    Illuminate Work Area Safely...30
    Replace Safety Signs...31
    Use Proper Lifting Equipment...32
    Remove Paint Before Welding or Heating...33
    Avoid Heating Near Pressurized Fluid Lines...34
    Keep ROPS Installed Properly...49
    Service Tires Safely...36
    Practice Safe Maintenance...37
    Use Proper Tools...39
    Decommissioning — Proper Recycling and Disposal of Fluids and Components...40
    Live With Safety...41
  Group 02: General Specifications...742
    304H Loader Specifications...742
    Drain and Refill Capacities...46
  Group 03: Torque Values...14
    Hardware Torque Specifications...742
    Keep ROPS Installed Properly...49
    Metric Bolt and Screw Torque Values...50
    Additional Metric Cap Screw Torque Values...52
    Service Recommendations For Metric 24° O-Ring Seal DIN 20078...54
    Service Recommendations For Non-Restricted Banjo (Adjustable) Fittings...56
    Service Recommendations For O-Ring Boss Fittings With Shoulder...59
    Service Recommendations for Metric Series Four Bolt Flange Fitting...62
    Service Recommendations For Inch Series Four Bolt Flange Fittings...64
  Group 04: Fuels and Lubricants...15
    Diesel Fuel...68
    Lubricity of Diesel Fuel...70
    Low Sulfur Diesel Fuel Conditioner...71
    Diesel Fuel Storage...72
    Fuel Tank...73
    Diesel Engine Oil — Non-Emissions Certified and Certified Tier 1 and Stage I...74
    Hydraulic System, Park Brake, and Differential Oil...76
    Service Brake Oil...77
    Grease...78
    Alternative and Synthetic Lubricants...79
    Lubricant Storage...80
    Mixing of Lubricants...81
Section 9005: Operational Checkout Procedure...82
  Group 10: Operational Checkout Procedure...82
    Operational Checkout Record Sheet—304H...86
    Complete Machine Operational Checkout...89
Section 9010: Engine...142
  Group 05: Theory of Operation...142
    Yanmar 3.3 L (4TNE98) Engine—Use CTM119...180
    Engine—Sectional View...145
    General Engine Description...147
  Group 15: Diagnostic Information...142
    Yanmar 3.3 L (4TNE98) Engine—Use CTM119...180
    Make Visual Inspection of Engine and Supporting Systems...150
    Diagnose Engine Malfunctions...152
  Group 20: Adjustments...142
    Yanmar 3.3 L (4TNE98) Engine—Use CTM119...180
    JT05801 Clamp-On Electronic Tachometer Installation...677
    Alternator and A/C Compressor Belts Tension Adjustment...168
    Slow and Fast Idle Adjustment...172
    Speed Control Linkage Adjustment...174
    Injection Pump Static Timing Adjustment...175
  Group 25: Tests...142
    Yanmar 3.3 L (4TNE98) Engine—Use CTM119...180
    JT05801 Clamp-On Electronic Tachometer Installation...677
    JT05800 Digital Thermometer Installation...678
    Air Intake System Leakage Test...183
    Fuel Line Leakage Test...184
    Engine Power Test Using Engine Pulldown...185
Section 9015: Electrical System...188
  Group 05: System Information...188
    Electrical System Visual Inspection...193
    Electrical Circuit Malfunctions...194
    High Resistance Circuit...196
    Open Circuit...198
    Grounded Circuit...200
    Shorted Circuit...202
    Sensor Circuit Shorted to Power...204
    Sensor Circuit Shorted to Itself...206
    Sensor Circuit Shorted to Ground...208
    Multimeter...210
    Seven Step Electrical Test Procedure...211
    Schematic, Wiring Diagram, and Component Location Information...213
    Reading a System Functional Schematic...214
    Reading a Wiring Diagram...216
    Reading a Component Location Diagram...218
    Reading a Connector End View Diagram...220
    Electrical Schematic Symbols...221
    Component Identification Table...223
    Fuse (Blade-Type) Color Codes...225
  Group 10: System Diagrams...188
    Fuse Specifications...742
    Main System Functional Schematics and Component Location Legend...230
    Main System Functional Schematic Section Legend...236
    Main System Functional Schematic...237
    Power And Battery Cables (W1) Component Location...240
    Loader/Rear Frame Harness (W2) Component Location...241
    Loader/Rear Frame Harness (W2) Connectors, Wire, And Pin Locations...242
    Cab Main Harness (W3) Component Location...244
    Cab Main Harness (W3) Connectors, Wire, And Pin Locations...246
    Front Console Harness (W4) Component Location...248
    Front Console Harness (W4) Connectors, Wire, And Pin Locations...249
    Side Console Harness (W5) Component Location...251
    Cab Rear Harness (W6) Component Location...252
    Cab Work Light Harness (W7) Component Location...253
    Cab Work Light Harness (W7) Connectors, Wire, And Pin Locations...254
    Optional Hydraulic Fourth Function Harness (W16) Component Location...255
    Blower And A/C Harness (Door Mounted) (W17) Component Location...256
    A/C Harness (Roof Mounted) (W18) Component Location...258
  Group 15: Sub-System Diagnostics...189
    Power Circuit Operational Information...260
    Power Circuit Theory Of Operation...261
    Power Circuit Functional Schematic...263
    Power Circuit Diagnostic Procedures...264
    Monitor Power, Alarm, And Mode Switch Circuits Operational Information...269
    Monitor Power, Alarm, And Mode Switch Circuits Theory Of Operation...270
    Monitor Power, Alarm, And Mode Switch Circuits Functional Schematic...271
    Monitor Power, Alarm, And Mode Switch Circuits Diagnostic Procedures...272
    Neutral Start Circuit Operational Information...276
    Neutral Start Circuit Theory Of Operation...277
    Neutral Start Circuit Functional Schematic...278
    Neutral Start Circuit Diagnostic Procedures...279
    Preheat And Start Release Circuits Operational Information...290
    Preheat And Start Release Circuits Theory Of Operation...291
    Preheat And Start Release Circuits Functional Schematic...292
    Preheat And Start Release Circuits Diagnostic Procedures...293
    Fuel Shut-Off Circuit Theory of Operation...299
    Fuel Shut-Off Circuit Functional Schematic...300
    Fuel Shut-Off Circuit Diagnostic Procedures...301
    Charging Circuit Operational Information...308
    Charging Circuit Theory Of Operation...309
    Charging Circuit Functional Schematic...310
    Charging Circuit Diagnostic Procedures...311
    Hydrostatic Transmission Control, Park Brake Release, And Backup Alarm Circuits Specifications...742
    Hydrostatic Transmission Control, Park Brake Release, And Backup Alarm Circuits Operational Information...315
    Hydrostatic Transmission Control, Park Brake Release, And Backup Alarm Circuits Theory Of Operation...316
    Hydrostatic Transmission Control, Park Brake Release, And Backup Alarm Circuits Functional Schematic...319
    Hydrostatic Transmission Control, Park Brake Release, And Backup Alarm Circuits Diagnostic Procedures...320
    Pilot, Boom Height Kickout, And Return-To-Dig Circuit Operational Information...362
    Pilot, Boom Height Kickout, And Return-To-Dig Circuit Theory Of Operation...363
    Pilot, Boom Height Kickout, And Return-To-Dig Circuit Functional Schematic...365
    Pilot, Boom Height Kickout, And Return-To-Dig Diagnostic Procedures...366
    Cooling Fan Drive Low/High Speed Circuit Operational Information...388
    Cooling Fan Drive Low/High Speed Circuit Theory Of Operation...389
    Cooling Fan Drive Low/High Speed Circuit Functional Schematic...390
    Fan Drive Low/High Speed Circuit Diagnostic Procedures...391
    Turn Lights And Flasher Circuit Operational Information...395
    Turn Lights And Flasher Circuit Theory Of Operation...396
    Turn Lights And Flasher Circuit Functional Schematic...397
    Turn Lights And Flasher Circuit Diagnostic Procedures...398
    Brake Lights Circuit Operational Information...411
    Brake Lights Circuit Theory Of Operation...412
    Brake Lights Circuit Functional Schematic...413
    Brake Lights Circuit Diagnostic Procedures...414
    Drive Lights, Marker Lights, And Tail Lights Circuits Operational Information...417
    Drive Lights, Marker Lights, And Tail Lights Circuits Theory Of Operation...418
    Drive Lights, Marker Lights, And Tail Lights Circuits Functional Schematic...419
    Drive Lights, Marker Lights, And Tail Lights Circuit Diagnostic Procedures...420
    Cab Work, Dome, And Beacon Lights Circuits Theory Of Operation...426
    Cab Work, Dome, And Beacon Lights Circuit Functional Schematic...427
    Cab Work, Dome, And Beacon Lights Circuits Diagnostic Procedures...428
    Radio And Accessories Circuit Theory Of Operation...433
    Radio And Accessories Circuit Functional Schematic...434
    Front Windshield Wiper And Horn Circuit Theory Of Operation...435
    Front Windshield Wiper And Horn Circuit Functional Schematic...436
    Front Windshield Wiper And Horn Circuit Diagnostic Procedures...437
    Rear Windshield Wiper Circuit Theory Of Operation...440
    Rear Windshield Wiper Circuit Functional Schematic...441
    Rear Windshield Wiper Circuit Diagnostic Procedures...442
    Heater Blower And Air Conditioning Circuit Operational Information...445
    Heater Blower And Air Conditioning Circuit Theory Of Operation...446
    Heater Blower And Air Conditioning Circuit Functional Schematic...448
    Heater Blower And Air Conditioning Circuit Diagnostic Procedures...449
    Hydraulic Fourth Function Circuit Operational Information...455
    Hydraulic Fourth Function Circuit Theory Of Operation...456
    Hydraulic Fourth Function Circuit Functional Schematic...457
    Hydraulic Fourth Function Circuit Diagnostic Procedures...458
  Group 20: References...191
    Alternators And Starting Motors—Use CTM119...462
    Battery Specifications...742
    Battery Operation...464
    Diagnose Battery Malfunctions...465
    Check Battery Electrolyte Level And Terminals...466
    Procedure For Testing Batteries...469
    Using Booster Batteries—12 Volt System...470
    Change Monitor Speed Display—Metric/English...472
    Monitor Service Codes...474
  Group 25: Adjustments...191
    Speed Sensor Adjustment...478
    Adjust Boom Height Kickout...479
    Adjust Return-To-Dig...481
Section 9020: Power Train...483
  Group 05: Theory Of Operation...483
    Power Train Description...487
    Drive Dampener...489
    Hydrostatic Transmission Operation—Neutral...491
    Hydrostatic Transmission—Forward (Low Speed)...494
    Hydrostatic Transmission—Forward (High Speed)...497
    Hydrostatic Transmission—Reverse (Low Speed)...500
    Hydrostatic Pump Operation...503
    Hydrostatic Pump Swashplate Operation...505
    Hydrostatic Pump Control Operation—Reverse (Engine Speed At Less Than Fast Idle)...507
    Hydrostatic Pump Control Operation—Forward (Engine Speed At Fast Idle)...510
    High Pressure Relief Valve Operation...513
    Hydrostatic Motor Operation—Neutral...515
    Hydrostatic Motor—Reverse (Low Speed)...517
    Hydrostatic Motor—Forward (High Speed)...519
    Inching Valve Operation...521
    Service And Park Brake Description...522
    Park Brake Release Solenoid Valve Operation...524
    Park Brake Operation...527
    Front And Rear Axle Differential Operation...529
    Final Drive Operation...530
    Gear Case Operation...532
  Group 15: Diagnostic Information...483
    Diagnose Hydrostatic Transmission Malfunctions...539
    Diagnose Differential And Axle Malfunctions...544
    Diagnose Driveline Malfunctions...546
    Diagnose Park Brake Malfunctions...547
    Diagnose Service Brake Malfunctions...549
    Hydraulic Circuit Symbols...664
    Power Train Component Location...551
    Service And Park Brake System Component Location...553
    Hydrostatic Transmission Schematic...555
    Service And Park Brake System Schematic...557
  Group 20: Adjustments...484
    JT05801 Clamp-On Electronic Tachometer Installation...677
    JT05800 Digital Thermometer Installation...678
    Hydrostatic Transmission Oil Warm-Up Procedure...581
    Hydrostatic Pump Servo Piston Neutral Adjustment...563
    Hydrostatic Motor Minimum Displacement Adjustment...565
    Brake/Inching Pedal Linkage Adjustment...567
    Park Brake Adjustment...572
    Hydrostatic Start-Up Procedure...574
    Hydraulic Oil Clean-Up Procedure Using Portable Filter Caddy...674
  Group 25: Tests...484
    JT05801 Clamp-On Electronic Tachometer Installation...677
    JT05800 Digital Thermometer Installation...678
    Hydrostatic Transmission Oil Warm-Up Procedure...581
    Before Performing Hydrostatic Transmission Tests...582
    Neutral Charge Relief Valve Pressure Test And Adjustment...583
    Hydrostatic Motor Begin Regulation Of Displacement Control Valve Test And Adjustment...586
    Hydrostatic Pump Begin Regulation Test And Adjustment...590
    Hydrostatic Pump Performance (Timing) Test And Adjustment...593
    High Pressure Relief Valve Test And Adjustment...598
    Hydrostatic Pump Pressure Override (POR) Valve Pressure Test And Adjustment...602
    Hydrostatic Pump Isolation Procedure...606
    Directional Control Valve Spool Leakage Test...611
    Hydrostatic Adjusting Screws (With Tamper-Proof Caps)...614
    Park Brake Release Pressure Test...616
Section 9025: Hydraulic System...618
  Group 05: Theory Of Operation...618
    Main Hydraulic System...623
    Main Hydraulic Pump...626
    Priority Valve...627
    Steering Circuit...630
    Steering Valve...632
    Steering Valve, Cylinder Relief Valve...634
    Loader Control Valve...635
    System And Circuit Relief Valves (With Anti-Cavitation)...637
    Pilot Control Valve...639
    Pilot Lockout Solenoid Valve Operation...641
    Cooling Fan Pump And Motor Circuit...644
  Group 15: Diagnostic Information...618
    Diagnose Hydraulic System Malfunctions...655
    Hydraulic Circuit Symbols...664
    Loader, Fan Drive and Fourth Function System Component Location...665
    Steering System Component Location...666
    Loader, Fan Drive, and Fourth Function System Schematic...668
    Steering System Schematic...670
  Group 20: Adjustments...618
    Hydraulic Oil Clean-Up Procedure Using Portable Filter Caddy...674
  Group 25: Test...618
    JT05801 Clamp-On Electronic Tachometer Installation...677
    JT05800 Digital Thermometer Installation...678
    Hydraulic Oil Warm-Up Procedure...679
    Boom Lock Installation...680
    Main Hydraulic Pump Flow Test...681
    Steering System Maximum Pressure Test...684
    Steering Valve Leakage Test...687
    Steering Cylinder Leakage Test...690
    Loader System Relief Valve Pressure Test...692
    Loader Circuit Relief Valve Pressure Test...695
    Loader Cylinder Drift Test...699
    Boom and Bucket Cylinder Leakage Test...701
    Pilot Control Valve Pressure Test...703
    Cooling Fan Motor RPM Test...708
    Cooling Fan System Pressure and Pump Flow Test...710
    Cycle Time Test...714
Section 9031: Heating and Air Conditioning...715
  Group 05: Theory of Operation...715
    Proper Refrigerant Handling...763
    R134a Refrigerant Cautions...764
    Refrigerant Theory of Operation...720
    Compressor Operation...722
    Condenser Operation...723
    Receiver-Dryer Operation...724
    Expansion Valve Operation...725
    Freeze Control Switch Operation...727
    Evaporator Coil Operation...728
    Heat Exchanger Operation...729
    Temperature Control, Blower Switch, and Air Conditioning Switch Operation (Door Mounted)...730
    Low/High Pressure Switch (Door Mounted)...732
  Group 15: Diagnostic Information...715
    Diagnose Air Conditioning System Malfunctions...735
    Diagnose Heater System Malfunctions...737
  Group 20: Adjustments...715
    Essential Tools...739
    Service Equipment and Tools...740
    Other Material...741
    Specifications...742
    R134a Refrigerant Cautions...764
    R134a Compressor Oil Charge Check...744
    R134a Compressor Oil Removal...745
    R134a Component Oil Charge...746
    Leak Testing...777
    Refrigerant Hoses and Tubing Inspection...765
    R134a Refrigerant Recovery, Recycling and Charging Station Installation Procedure...749
    Recover R134a System...751
    Evacuate R134a System...753
    Charge R134a System...755
    Air Conditioner System Cleaning Procedures...757
    Purge Air Conditioner System...758
    Flush Air Conditioner System...759
  Group 25: Tests...716
    Proper Refrigerant Handling...763
    R134a Refrigerant Cautions...764
    Refrigerant Hoses and Tubing Inspection...765
    R134a Air Conditioning System Test...766
    Operating Pressure Diagnostic Chart...769
    Low/High Pressure Switch Test...773
    Freeze Control Switch Test...776
    Leak Testing...777

John Deere 4WD Loader 304H Diagnostics Technical Manual (TM1863)