Technical manual
Table Of Contents
- ZW180_TO4GD-E-00
- INTRODUCTION
- SECTION AND GROUP CONTENTS
- SECTION 1 GENERAL
- SECTION 2 SYSTEM
- Group 1 Control System
- Group 2 ECM System
- Group 3 Hydraulic System
- Group 4 Electrical System
- Outline
- Main Circuit
- Electric Power Circuit
- Indicator Light Check Circuit
- Accessory Circuit
- Preheat Circuit
- Starting Circuit
- Charging Circuit
- Serge Voltage Prevention Circuit
- Engine Stop Circuit
- Lamplight Circuit
- Head Light Circuit
- Turn Signal Circuit
- Brake Light Circuit
- Hazard Light Circuit
- Horn Circuit
- Reverse Light/Buzzer Circuit
- Parking Brake Circuit
- Emergency Steering Check Circuit (Optional)
- SECTION 3 COMPONENT OPERATION
- Group 1 Pump Device
- Group 2 Control Valve
- Group 3 Hydraulic Fan Motor
- Group 4 Steering Pilot Valve
- Group 5 Steering Valve
- Group 6 Pilot Valve
- Outline (Standard Lever Type Pilot Valve for Front Attachment)
- Operation
- Electromagnetic Detent
- Outline (Joystick Type Pilot Valve for Front Attachment)
- Operation
- Electromagnetic Detent
- Outline (Two-Derectional Lever Type Pilot Valve for Additional Circuit) (Optional)
- Operation
- Outline (Joystick Type Pilot Valve for Additional Circuit) (Optional)
- Operation
- Group 7 Charging Block
- Group 8 Ride Control Valve
- Group 9 Drive Unit
- Group 10 Axle
- Group 11 Brake Valve
- Group 12 Others
- SERVICE MANUAL REVISION REQUEST FORM
COMPONENT OPERATION / Brake Valve
T3-11-4
OPERATION
Not in Operation of Brake
1. When the brake valve is not operated, ports (BR1,
BR2) are connected to tank port (T) as spring (9)
returns spools (7, 8) to the non-operating position.
2. As ports (M1, M2) and brake ports (BR1, BR2) are
blocked by spools (7, 8), pressure oil in the
service brake accumulator is retained.
T4GB-03-11-004
T
M2
M1
BR1
BR2
7
8
9