Welding Repairs IMPORTANT When disconnecting or connecting connectors between ECU and engine, or connector between ECU and the machine, always disconnect the battery to prevent damage to ECU. If you do not follow this procedure, the ECU will be damaged and/or the engine will not operate properly. When performing welding repairs, perform welding in a properly equipped place. Repairs must be performed by a qualified welder. Welding operations, can create potential hazards, including generation of gas, fire, or electric shock. Never let an unqualified welder do welding. A qualified welder must do the following: To prevent battery explosion, turn battery disconnect switch to "OFF" position.
Disconnect the connector between ECU and machine, and the connector between ECU and engine. To prevent generation of gas, remove paint from location of the weld. If hydraulic equipment, piping or component ports close to them are heated, a flammable gas or mist could result in an explosion or fire. To prevent this, protect and insulate components from excessive heat. Do not weld on pipes or on tubes that contain flammable fluids. Do not flame cut pipes or tubes that contain flammable fluids. Before welding on pipes or tubes, or before flaming cut pipes or tubes, clean them thoroughly with a nonflammable solvent.
Make sure pressure inside pipes or tubes does not cause a rupture of the component parts. If heat is applied directly to rubber hoses or piping under pressure, they may suddenly break, so cover and insulate them with a fireproof covering. Wear protective clothing. Make sure there is good ventilation. Remove all flammable objects and make sure a fire extinguisher is available. DX225LC-3 Safety 1-56