Technical Manual Hitachi ZX10U-6 Excavator TAAA50-EN-01 (Preview)
TAAA50-EN-01
INTRODUCTION
To The Reader
Additional References
Manual Composition
Page Number
Trademark
Safety Alert Symbol and Headline Notations
Units Used
SYMBOL AND ABBREVIATION
Symbols and abbreviations
SAFETY
Recognize Safety Information
Understand Signal Words
Follow Safety Instructions
Prepare for Emergencies
Wear Appropriate Clothing
Protect Against Noise
Inspect Machine
General Precautions for the Cab
Use Handholds and Steps
Ensure Safety Before Rising from or Leaving Operator’s Seat
Fasten Your Seat Belt (Roll Bar Equipped Machines)
Move and Operate Machine Safely
Operate Only from Operator’s Seat
Jump Starting
Keep Riders off Machine
Precautions for Operations
Investigate Job Site Beforehand
Restriction of Attachment Installation
Provide Signals for Jobs Involving Multiple Machines
Confirm Direction of Machine to Be Driven
Drive Machine Safely
Avoid Injury from Rollaway Accidents
Avoid Injury from Back-Over and Swing Accidents
Keep People Clear from Working Area
Never Position the Bucket Over Anyone
Avoid Undercutting
Avoid Tipping
Never Undercut a High Bank
Dig with Caution
Operate with Caution
Avoid Power Lines
Precautions for Lightning
Lifting Application
Protect Against Flying Debris
Park Machine Safely
Handle Fluids Safely−Avoid Fires
Transport Safely
Performing Inspections and Maintenance Safely
Warn Others of Service Work
Support Machine Properly
Stay Clear of Moving Parts
Prevent Parts from Flying
Avoid Injury from Attachment Falling Accident
Prevent Burns
Replace Rubber Hoses Periodically
Avoid High-Pressure Fluids
Prevent Fires
Evacuating in Case of Fire
Beware of Exhaust Fumes
Precautions for Welding and Grinding
Avoid Heating Near Pressurized Fluid Lines
Avoid Applying Heat to Lines Containing Flammable Fluids
Remove Paint Before Welding or Heating
Beware of Asbestos and Silicon Dust and Other Contamination
Prevent Battery Explosions
Handle Chemical Products Safely
Dispose of Waste Properly
Never Ride Attachment
TOPS
Before Returning the Machine to the Customer
SECTION AND GROUP CONTENTS
CONTENTS
GENERAL
Specifications
ZX10U-6 Specifications (Up to Serial No. 021214 (Excluding Serial No. 021091))
Working Ranges of ZX10U-6 (Up to Serial No. 021214 (Excluding Serial No. 021091))
ZX10U-6 Specifications (Serial No. 021091, Serial No. 021215 and Up)
Working Ranges of ZX10U-6 (Serial No. 021091, Serial No. 021215 and Up)
Component Layout
Main Component
Electrical System (Overview)
Electrical System (Relays)
Electrical System (Monitor, Switches)
Engine
Swing Device
Travel Device
Control Valve
2-Spool Solenoid Valve Unit
Air Bleed Solenoid Valve
Port Layout of Control Valve (Main Circuit)
Port Layout of Control Valve (Pilot Circuit)
Floor Harness
Light Harness (Halogen)
Component Specifications
Specifications of Engine
Specifications of Engine Accessories
Specifications of Hydraulic Component
Specifications of Electrical Component
SYSTEM
Hydraulic System
Outline of Hydraulic System
Pilot Circuit of Hydraulic System
Operation Control Circuit
Travel Motor Displacement Angle Control Circuit
Air Bleeding Circuit
Main Circuit of Hydraulic System
Neutral Circuit
Relief Circuit
Single Operation Circuit
Combined Operation Circuit
Electrical System
Outline of Electrical System
Main Circuit of Electrical System
Electric Power Circuit (Key Switch: OFF)
Electric Power Circuit (Key Switch: ON)
Preheating Circuit (Key Switch: HEAT)
Starting Circuit (Key Switch: START)
Charging Circuit (Key Switch: ON)
Alternator Operation
Regulator Operation
Pilot Shut-Off Circuit (Key Switch: ON)
Engine Stop Circuit (Key Switch: OFF)
Lamp Unit Circuit
COMPONENT OPERATION
Pump device
Outline of Pump Device
Outline of Main Pump P1 and Main Pump P2
Outline of Pilot Pump
Swing Device
Outline of Swing Device
Outline of Swing Motor
Operation of Swing Motor
Outline of Valve Unit
Operation of Make-Up Valve
Control Valve
Outline of Control Valve
Components in Control Valve
Hydraulic Circuit of Control Valve
Outline of Main Relief Valve
Operation of Main Relief Valve
Outline of Overload Relief Valve
Relief Operation of Overload Relief Valve
Make-Up Operation of Overload Relief Valve
Operation of Make-Up Valve
Pilot Valve
Outline of Pilot Valve
Outline of Front Attachment/Swing Pilot Valve
Operation of Front Attachment/Swing Pilot Valve
When Front Attachment/Swing Pilot Valve in Neutral (Output Curve: A to B)
During Metering or Decompressing of Front Attachment/Swing Pilot Valve (Output Curve: C to D)
Travel Device
Outline of Travel Device
Outline of Travel Reduction Gear
Outline of Travel Motor
Operation of Travel Motor
Outline of Travel Brake Valve
Operation of Counterbalance Valve (During Travel)
Operation of Counterbalance Valve (When Descending a Slope)
Operation of Travel Mode Selector Valve (Slow Speed Operation)
Operation of Travel Mode Selector Valve (Fast Speed Operation)
Operation of Travel Mode Selector Valve (When Engine Stop)
Others (Upperstructure)
Outline of 2-Spool Solenoid Valve Unit
Operation of Pilot Shut-Off Solenoid Valve (Pilot Shut-Off Lever: LOCK Position)
Operation of Pilot Shut-Off Solenoid Valve (Pilot Shut-Off Lever: UNLOCK Position)
Operation of Travel Mode Selector Solenoid Valve (Slow Speed Position)
Operation of Travel Mode Selector Solenoid Valve (Fast Speed Position)
Operation of Pilot Relief Valve
Outline of Air Bleed Solenoid Valve
Operation of Air Bleed Solenoid Valve (Pilot Shut-Off Lever: UNLOCK Position)
Operation of Air Bleed Solenoid Valve (Pilot Shut-Off Lever: LOCK Position)
Others (Undercarriage)
Outline of Swing Bearing
Outline of Center Joint
Outline of Track Adjuster
OPERATIONAL PERFORMANCE TEST
Performance Test
Operational Performance Tests
Preparation for Performance Tests
Standard
Operational Performance Standard Table
Engine System Performance Standards
Travel System Performance Standards
Swing System Performance Standards
Front Attachment System Performance Standards
Lever System Performance Standards
Combined Operation System Performance Standards
Components System Performance Standards
Main Pump P1 and Main Pump P2 P-Q Diagram
Engine Test
Engine Speed
Machine Performance Test
Travel Speed
Track Revolution Speed
Mistrack Check
Travel Parking Leakage
Swing Speed
Swing Function Drift Check
Swing motor leakage
Maximum Swingable Slant Angle
Swing Bearing Play
Hydraulic Cylinder Cycle Time
Dig Function Drift Check
Control Lever Operating Force
Control Lever Stroke
Combined Operation of Boom Raise and Swing Function Check
Clearance of Front Attachment Connecting Part
Component Test
Primary Pilot Pressure
Secondary Pilot Pressure
Main Relief Set Pressure
Overload Relief Valve Set Pressure
Swing Motor Drainage
Travel Motor Drainage
Adjustment
Engine Control Lever Adjustment
TROUBLESHOOTING
Diagnosing Procedure
Introduction
Diagnosis Procedure
Electrical System Inspection
Precautions for Inspection and Maintenance
Instructions for Disconnecting Connectors
Instructions for Removing Relays
Fuse Inspection
Fuse Connection Destination
Slow Blow Fuse Inspection
Battery Voltage Check
Alternator Check
Continuity Check
Voltage Inspection Method
Voltage and Current Measurement of 5-Volt Circuit
Troubleshooting B
Troubleshooting B (Machine Diagnosis by Using Trouble Symptom) Procedure
Contents of Troubleshooting B
Identification Symbol of Troubleshooting B
E-1 Starter does not rotate.
E-2 Even if starter rotates, engine does not start.
E-3 Engine is difficult to start at low temperature (During cold weather or in cold districts, engine is difficult to start or does not start even if preheated.)
A-1 All actuator speeds are slow and power is weak. (Boom, Arm, Bucket, and Swing)
A-2 All actuators do not work. (Boom, arm, bucket and swing)
A-3 Actuator does not stop even if control lever is set to neutral. (Boom, arm, bucket and swing)
A-4 Actuator does not stop even if control lever is set to neutral. (Amount of drift is large)(Other than bucket,blade and side frame extend/retract)
F-1 All front attachment actuator power are weak.
F-2 Some cylinders are not operated or speeds are slow.
F-3 Front attachment drifts remarkably.
F-4 When boom raise or arm roll-out is operated, boom or arm starts to move after moving slightly down.
F-5 Boom swing is not operated or moves slowly.
S-1 Swing speed is slow or is not operated.
S-2 Swing drifts remarkably when swinging is stopped.
T-1 Machine does not travel, travels slowly, power is weak.
T-2 Fast travel can not be selected. Travel mode does not change from slow speed mode to fast speed mode.
T-3 Slow travel is not selected. Travel mode does not change from fast mode to slow mode.
T-4 One side travel is not operated or travel speed is slow. Machine mistracks.
BL-1 Blade is not operated or moves slowly.
SF-1 Side frame is not operated or moves slowly.
How to Lowering Boom When Emergency and When Engine Stops
Troubleshooting C
Troubleshooting C (Lamp Unit Diagnosis) Procedure
Contents of Troubleshooting C
The hour meter does not count.
Even when the engine overheats, the indicator does not light.
Even when coolant temperature is low, the indicator light.
Even when the engine oil pressure is insufficient, the indicator does not light.
Even when the engine runs, the indicator is not turned OFF.
Even when the engine runs, the alternator indicator is not turned OFF.
Even when charging is low, the alternator indicator does not light.
SERVICE MANUAL REVISION REQUEST FORM
The Attached Diagram List
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