Safety - Section 20 8/11 OM2041 Page 20-16 WHEN REPAIRS ARE NECESSARY 1. Only qualified maintenance personnel who under- stand the systems being repaired must attempt repairs. 9. If a truck is to be towed for any reason, use a rigid tow bar. Check the truck cab for decals for special towing precautions. (Also refer to the Operation and Maintenance Manual, Operating Instructions - Towing.) 2. Many components on the Komatsu truck are large and heavy. Ensure that lifting equipment - hoists, slings, chains, lifting eyes - are of adequate capacity to handle the lift. 10. Drain, clean and ventilate fuel tanks and/or hydraulic tanks before making any welding repairs. 3.
DO NOT stand under a suspended load. DO NOT work under raised body unless body safety cables, props, or pins are in place to hold the body in up position. 4. DO NOT repair or service the truck while the engine is running, except when adjustments can only be made under such conditions. Keep a safe distance from moving parts. Any operating fluid, such as hydraulic oil or brake fluid escaping under pressure, can have sufficient force to enter a person's body by penetrating the skin. Serious injury and possibly death may result if proper medical treatment by a physician familiar with this injury is not received immediately. 5.
When servicing any air conditioning system with refrigerant, wear a face shield and cold resistant gloves for protection against freezing. Ensure all current regulations for handling and recycling refrigerants are followed. 11. Relieve pressure in lines or hoses before making any disconnects. 6. Follow package directions carefully when using cleaning solvents. 12. After adjustments or repairs, replace all shields, screens and clamps. 7. If an auxiliary battery assist is needed, refer to Jump Starting With Booster Cables or Jump Start- ing With Receptacles earlier in this section. 13. Working near tires can be dangerous. Use extreme caution when working around tires. 8.
Before performing any welding on the truck, always turn the battery disconnect switches to the OFF position and disconnect the alternator posi- tive cable. Failure to do so may seriously damage the battery and electrical equipment. It is not nec- essary to disconnect or remove any control circuit cards on electric drive dump trucks. Always fasten the welding machine ground (-) lead to the piece being welded; the grounding clamp must be attached as near as possible to the weld area. Never allow welding current to pass through ball bearings, roller bearings, sus- pensions, or hydraulic cylinders. Always avoid laying welding cables over or near the vehicle electrical harnesses.
Welding voltage could be induced into the electrical harness and cause damage to components. DO NOT stand in front of a rim and locking ring when inflating a tire mounted on the machine. Observers must not be permitted in the area. DO NOT weld or apply heat to the rim assembly with the tire mounted on the rim. Resulting gases inside the tire may ignite, causing explosion of the tire and rim. 14. Only a qualified operator or experienced mainte- nance personnel who are also qualified in opera- tion can move the truck under its own power in the repair facility or during road testing after repairs are complete.