Hitachi ZW 20 Wheel Loader Technical Manual (T4EJ-E-00) – PDF Download

Description

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

HITACHI ZW 20 WHEEL LOADER TECHNICAL MANUAL (T4EJ-E-00) – PDF DOWNLOAD:

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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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