Komatsu WA470-6, WA480-6, WA470-6LC, WA480-6LC Loader Service Manual

Table of Contents

• Index and Foreword
• Specification
• Structure, functions and maintenance standard
• Standard Value Table
• Testing and Adjusting
• Troubleshooting
• Disassembly and Assembly
• Diagrams and Drawings

Self-check operation of emergency steering
– The emergency steering system automatically checks its operability 3 seconds after (on completion of machine monitor self-check) the starting switch is turned to “ON” position.
The self-check, however, is not performed in the following cases.

1) When the starting switch is set to the “START” position and the starting motor starts 2) When the engine is already in operation (when the engine speed of above 500 rpm is detected)
3) While the steering oil pressure is being sensed
4) When the automatic preheater operates
5) When an error related to the emergency steering is detected in the process of self-check by the machine monitor
6) In the case where engine run time after the previous self-check is shorter than 10 seconds (when the engine operation at 500 rpm for minimum 10 seconds has not been detected) q When self-check of the emergency steering is started, the emergency steering activation signal is output for up to a maximum of 3 seconds.

If the machine monitor detects the emergency steering operation pressure within 3 seconds, the machine monitor transmits the emergency steering operation sensing signal to the transmission controller through network. Receiving the signal, it ends self-check of the emergency steering.

If the machine monitor does not detect the emergency steering operation pressure within 3 seconds, the transmission controller is unable to recognize the emergency steering operation sensing signal from the machine monitor, and thus generates an error message.