Table of Contents

Main Body Section

Specifications

1. Main Data
2. Performance
3. Main Body Dimensions
4. Engine
5. Cooling System
6. Upper Side Work System
7. Operating Device
8. Swing Units
9. Travel Lower Body
10. Dozer Blade

Hydraulic Equipment

1. Hydraulic Device
2. Control Valve, Cylinder

Capacities, Filters

1. Coolant and Oil Capacities
2. Hydraulic Oil Filters
3. Fuel Filter

Overall View

1. Overall View (80)
2. Standard Arm (1.71 m)
3. Long Arm (2.12 m)

Work Range Diagram

1. Work Range Diagram (80)
1. Standard Arm (1.71 m)
2. Long Arm (2.12 m)

Optional Components

1. List of Optional Components

Major Equipment

1. Equipment Configuration
1. Overall
2. Operator’s Cab

Main Equipment Table

1. Lower Mechanism
2. Assembly Diagrams (with blade)

Lower Component

1. Travel Unit
2. Take-up Roller
3. Upper-roller
4. Lower-roller
5. Recoil Spring
6. Shoes

Upper Component

1. Swing Unit

Engine-related

1. Engine
2. Muffler
3. Air Cleaner (double element)
4. Radiator

Hydraulic Device

1. Hydraulic pump

Control-related

1. Control Valve
2. Solenoid Valve (4 stack)
3. Remote Control Valve (left/right, travel operations)
4. Remote Control Valve Characteristic Diagram
5. Center Joint

Backhoe Attachment

1. Cylinder
2. Attachments

Fuel Tank

Sump Tank

Hydraulic Section

Hydraulic Pump Operational Description

1. Configuration and Principle of Operation

Flow Control

1. Constant controlling of simultaneous output
2. Power-down control by discharge pressure of blade pump (blade shift)

Control Valve Operation

1. Operation with All Spools in Neutral
1. Main passage
2. Signal passage

Independent Operation

1. Travel spool switch-over (Figure 1)
2. Backup spool switch-over (Figure 2)
3. Swing spool switch-over (Figure 3)
4. Bucket spool switch-over (Figure 3)
5. Boom spool switch-over
6. Arm spool switch-over
7. Blade spool switch-over (Add-on) (Figure 9)
8. Boom Swing spool switch-over (Add-on) (Figure 9A)
9. Relief valve
10. Anti-drift valve (Boom section)

Combined Operations

1. Additional operation with travel (Figure 14)

Relief Valve

1. Main relief valve
2. Overload relief valve

Swing Unit Swing Motor

1. Functional and Operational Description
2. Swash Plate Motor
3. Parking Brake (for models equipped with parking brakes)
4. Principle of Relief Valve Operation
5. Makeup Valve
6. Reduction Gear (2-stage planetary gear)

Overview

1. Features
2. Operational Description

Travel Unit Travel Motor

1. External Dimensional Drawing
2. Basic Structure and Drawings
1. Basic structure of GM motor
2. Parts list
3. Operational Description
1. Reduction gear
2. Hydraulic drive section

Hydraulic Circuit Section

Port Locations

1. Hydraulic Pump
2. Control Valve

Control Valve

Pilot Hose Connection Diagrams

1. Pilot P & T Lines
2. Pilot Control Lines

Functional Description

1. List of Functions
2. Control Valve Configuration Table

Overview

Explanation of Hydraulic Circuit and Operations (standard model)

1. Travel Circuits
1. High-speed Travel Circuit
2. Low-speed Travel Circuit
3. Straight-travel Circuit (Boom-Up and Travel-Forward)
2. Swing Circuit
1. Swing Parking Circuit
2. Swing Override Throttle Circuit
3. Bucket Circuit
1. Bucket-Opening Circuit
4. Arm Circuits
1. Arm-in / Arm-out 2-speed Circuit
5. Boom Circuits
1. Boom Circuit 1: Boom-up 2-speed Circuit
2. Boom Circuit 2: Boom-down Load Holding Valve Circuit
6. Boom Swing Circuit
1. Boom Swing Circuit
7. Blade Circuits
1. Blade Circuits

Explanation of Hydraulic Circuit and Operations (option)

1. Backup Circuits
2. Breaker and Crusher Circuit (2-speed confluence crusher circuit)
3. Breaker and Crusher Circuit (breaker circuit)
4. Ultra Small Tail Swing Hydraulic Excavator
5. Backup Reciprocating Circuit (ultra small swing hydraulic excavator)
6. Secondary Backup Reciprocating Circuit (ultra small tail swing hydraulic excavator)

Electric Circuits Section

Operational Description

1. Monitor Display
1. Monitor switch panel
2. List of Functions
2. Engine Control
1. Engine start-up control
2. Engine Start-up Circuit
3. Monitor Output Control
4. Monitor Display Control

Electric Circuit Diagrams

1. Electric Circuit Diagram 1
2. Electric Circuit Diagram 2
3. Electric Circuit Diagram: Air Conditioner 1
4. Electric Circuit Diagram: Air Conditioner 2

Harness Diagrams

1. Upper Frame
1. Frame Wiring Main Harness
2. Inside Cab
1. Cab Wiring Main Harness

Wiring Diagrams

1. Electrical Components and Wiring for Upper Frame (frame)
2. Electrical Components and Wiring for Cab
3. Electrical Components and Wiring for Upper Frame (engine)
4. Electrical Components and Wiring for Upper Frame (battery)
5. Heater
6. Air Conditioner
1. Inside Frame
2. Inside Cab

Maintenance Section

Measuring / Adjusting Pressure

1. Measuring Pressure
1. Basic conditions
2. Pressure settings
3. Ports for measuring pressure
4. Preparation for Measuring Pressure
5. Measuring Pressure
2. Pressure adjustment
1. Pressure adjusting points
3. Bleeding Air

Attachments Dimensions

1. Attachment Installation Methods

Appendix

1. Unit Conversion Table
2. New Hydraulic Oil
1. Long-life hydraulic oil (IDEMITSU Daphne Super Hydro 46SX)
3. Compatibility
1. List of Common Features and Compatibility of Major Parts