OM2041 9/11 Safety - Section 20 Page 20-15 WHEN REPAIRS ARE NECESSARY NOTE: Only qualified maintenance personnel who understand the systems being repaired should attempt repairs. 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, suspensions 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 possibly cause damage to components. Many components on the Komatsu truck are large and heavy.
Ensure that lifting equipment - hoists, slings, chains, and lifting eyes - are of adequate capacity to handle the lift. Do not work under a suspended load. Do not work under a raised body unless body safety cables, props or pins are in place to hold the body in up position. If the truck must be towed, use a rigid tow bar. Check the truck frame for a decal recommending special towing precautions. Also refer to Operating Instructions - Section 30, Towing. 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.
Drain, clean and ventilate fuel tanks and/or hydraulic tanks before making any welding repairs. When servicing any air conditioning system with refrigerant, wear a face shield and cold resistant gloves for protection against freezing. Follow all current regulations for handling and recycling refrigerants. Follow package directions carefully when using cleaning solvents. Any operating fluid, such as hydraulic oil, 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.
If an auxiliary battery assist is needed, refer to Jump Starting With Booster Cables or Jump Starting With Receptacles earlier in this section. Always disconnect the positive and negative battery cables of the vehicle before doing any welding on the unit. Failure to do so may seriously damage the battery and electrical equipment. Disconnect the battery charging alternator lead wire and isolate the electronic control components before making welding repairs. (It is not necessary to disconnect or remove any control circuit cards on electric drive dump trucks or any of the AID circuit control cards.) Relieve pressure in lines or hoses before making any disconnects.
After adjustments or repairs, replace all shields, screens and clamps. Only a qualified operator or maintenance personnel who are also qualified in truck operation should move the truck under its own power in the repair facility or during road testing after repairs are complete.