Komatsu WA500-7 Wheel Loader Repair Manual

Serial Number:
A94001 and up
10001 and up
Manuals: Shop Manual
Index and Foreword
Specification
Structure, functions and maintenance standard
Standard Value Table
Testing and Adjusting
Troubleshooting
Disassembly and Assembly
Maintenance Standard
Appendix
Diagrams and Drawings
Index
Backup lamp and brake lamp
1. From battery relay
2. Fuse box 1
3. Brake lamp switch
4. Brake lamp relay
5. Brake lamp (L.H.)
6. Brake lamp (R.H.)
Operation (WA500-G7B0-044-K-00-A)
When the brake pedal is depressed, the brake lamp switch contacts close and a current flows into the
brake lamp relay coil to close the relay contacts, and then the following circuit is formed and the right and
left brake lamps light up; Fuse → brake lamp relay terminal 3 o terminal 5 o right and left brake lamps o
ground.
When the brake pedal is released, the contacts of the brake lamp switch contacts open and the brake
lamp relay contacts open to turn the brake lamps OFF.
The current flows into the brake lamp circuit when the battery relay operates, thus the brake lamps do not
light up while the starting switch is in the OFF position.