MAINTENANCE BASICS 22.7 ELECTRICAL SYSTEM Do not remove or modify electrical components installed in the machine. Only install Komatsu Utility Corporation approved electrical components. When cleaning the machine or during heavy rainfall, pay attention that water does not get into the electrical sys- tem. If the wiring is wet or the insulation damaged, insulation faults will occur in the electrical system leading to dan- gerous malfunctions of the machine. When working in coastal areas, clean the system very thoroughly to avoid corrosion. Do not connect an external power source to fuses, the start switch, or the battery relay. Maintenance of the electrical system comprises:
1 - Checking the tension of the generator belt, 2 - Checking the generator belt for damage and wear, and 3 - Checking the acid level in the battery. 22.7.1 FUSES Parts of the electrical system may be damaged, if you replace fuses with the ignition switched on! Turn the start switch to switching position '0' (OFF), before starting to replace fuses. Fuses with wrong amperages may cause fires due to electrical faults or may immediately blow again! Only replace defective fuses with fuses of the same rating. The fuses protect the electrical system. Replace defective, corroded, or loose fuses. The fuses are located under the cover.
To access the fuses, remove the screws fixing the cover and remove the cover. Then remove the cover caps of the fuse boxes. 22.7.2 FUSE ASSIGNMENT 132 1 S tarter, stop magnet, socket 10A Solenoid valves gear unit 10A 2 In side lighting, radio 10A Direction indicator, horn 10A 3 H azard flasher 10A Instrument lighting 10A W 4 fr indscreen wiper and windscreen washer ont and rear 20A Working light 20A B 5 w rake light, reversing warning system, arning beacon 10A Side lamp left, lamp registration number 10A 6 F an, ventilation, heating 20A Side lamp right 10A 7 H eated rear windscreen 20A High beam 10A T 8 m ank sensor, solenoid valves high speed- otor, ALS (option) 10A Low beam 10A