Hitachi ZW 20 Wheel Loader Technical Manual (T4EJ-E-00)
File Details:
Hitachi ZW 20 Wheel Loader Technical Manual (T4EJ-E-00)
- Manual Language:English
- Pages: 264
- Size: 4.22 MB
- Format:PDF
- Downloadable:Yes
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Description:
Hitachi ZW 20 Wheel Loader Technical Manual (T4EJ-E-00)
TO THE READER
• This manual is written for an experienced technician to provide technical information needed to maintain and repair this machine.
• Be sure to thoroughly read this manual for correct product information and service procedures.
• If you have any questions or comments, at if you found any errors regarding the contents of this manual, please contact using “Service Manual Revision Request Form” at the end of this manual.
ADDITIONAL REFERENCES
• Please refer to the other materials (operator’s manual, parts catalog, engine technical material and Hitachi training material etc.) in addition to this manual.
MANUAL COMPOSITION
• This manual consists the Technical Manual and the Workshop Manual.
• Information included in the Technical Manual:technical information needed for redelivery and delivery, operation and activation of all devices and systems, operational performance tests, and troubleshooting procedures.
• Information included in the Workshop Manual:technical information needed for maintenance and repair of the machine, tools and devices needed for maintenance and repair, maintenance standards, and removal/installation and assemble/ disassemble procedures.
Table Of Contents:
Hitachi ZW 20 Wheel Loader Technical Manual (T4EJ-E-00)
COVER......................................................... 1 INTRODUCTION.................................................. 3 SAFETY........................................................ 5 SECTION AND GROUPCONTENTS..................................... 37 SECTION 1 GENERAL............................................. 39 Group 1 Specification..................................... 41 Specifications........................................ 41 Group 2 Component Specifications.......................... 43 Engine................................................ 43 HST Pump.............................................. 44 Gear Pump............................................. 44 Orbitroll............................................. 45 Group 3 Component Layout.................................. 47 Main Component (Overview)............................. 47 Main Component (Power Line)........................... 49 Hydraulic System (Overview)........................... 50 Electrical System (Overview).......................... 51 Electrical System (Monitor Panel)..................... 53 Engine................................................ 54 HST Pump.............................................. 55 HST Motor............................................. 55 Reduction............................................. 56 Control Valve......................................... 57 SECTION 2 SYSTEM.............................................. 59 Group 1 Fuel System....................................... 61 Outline............................................... 61 Group 2 Hydraulic System.................................. 63 Outline............................................... 63 HST Circuit........................................... 64 HST Oil Filter........................................ 66 Brake Circuit......................................... 67 Steering Circuit...................................... 68 Main Circuit Diagram.................................. 70 Group 3 Electrical System................................. 73 Outline............................................... 73 Electrical Circuit Diagram............................ 74 Power Circuit......................................... 76 Electric Power Circuit (Key Switch: OFF).............. 76 Preheat Circuit (Key Switch: HEAT).................... 77 Preheat Circuit (Key Switch: START)................... 78 Charging Circuit...................................... 79 Starting Circuit...................................... 80 Stop Circuit.......................................... 80 Monitor Indicator Circuit............................. 81 Gauge Circuit......................................... 82 Travel Circuit........................................ 83 Parking Brake Circuit................................. 87 Light Circuit......................................... 90 Horn Circuit.......................................... 91 Auto Leveler Circuit.................................. 91 SECTION 3 COMPONENT OPERATION................................. 93 Group 1 HST Pump.......................................... 95 HST Circuit........................................... 95 HST Pump.............................................. 96 High-Pressure Relief Valve............................ 98 Low-Pressure Relief Valve.............................100 HST Pump Characteristic Curve.........................100 DA Control............................................101 Displacement Angle Return Force and Advance...........110 Inching Valve.........................................111 Automatic Transmission Function.......................112 Torque Control Function...............................112 Group 2 HST Motor.........................................113 HST Motor.............................................113 Constand Control (HA Control).........................114 Group 3 Axle..............................................121 Axle..................................................121 Differential Assembly.................................122 Final Drive Assembly..................................123 Group 4 Brake.............................................125 Service Brake.........................................125 Parking Brake.........................................128 Towing Machine Method (In Emergency)..................130 Wet Type Brake Assembly in Reduction Gear.............131 Master Cylinder.......................................132 Group 5 Orbitroll.........................................133 Power Steering (Orbitroll)............................133 Operation in Neutral..................................136 At Right Swing Operation..............................137 At Relief Valve Operation.............................138 Group 6 Control Valve.....................................139 Control Valve.........................................139 Operation.............................................140 Operation of Tilt Section.............................141 Operation of Lift Section and Spool...................144 Detent Operation......................................148 Relief Valve..........................................150 Anti-Void Valve.......................................152 Group 7 Main Pump.........................................153 Main Pump.............................................153 Return Filter.........................................154 SECTION 4 OPERATIONAL PERFORMANCE TEST........................155 Group 1 Introduction......................................157 Operational Performance Tests.........................157 Preparation for Performance Tests.....................158 Group 2 Standard..........................................159 Standard..............................................159 Group 3 Engine Test.......................................161 ACT. Eng Speed........................................161 Engine Compression Pressure...........................162 Valve Clearance.......................................164 Nozzle................................................166 Group 4 Wheel Loader Test.................................169 Travel Speed..........................................169 Service Brake Control Function........................171 Parking Brake Control Function........................172 Hydraulic Cylinder Cycle Time.........................174 Hydraulic Cylinder Drift Check........................176 Control Lever Operating Force.........................177 Control Lever Stroke..................................178 Main Relief Set Pressure..............................179 Steering Relief Pressure..............................180 DA Control Pressure in HST Pump.......................181 Low Relief Pressure in HST Pump.......................181 High Relief Pressure in HST Pump......................182 SECTION 5 TROUBLESHOOTING.....................................183 Group 1 Diagnosing Procedure..............................185 Introduction..........................................185 Diagnosing Procedure..................................186 Group 2 Failure List......................................189 Trouble Symptoms Regarding the Engine.................189 Trouble Symptoms Regarding the Vehicle Performance....190 Group 3 Engine............................................191 Group 4 Vehicle Performance...............................201 SERVICE MANUAL REVISION REQUEST FORM..........................263
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