circuits. When working on trucks with any panels open, adhere to all regulations governing electrical and hydraulic maintenance. When performing maintenance procedures on or near batteries, take special care to protect yourself and your environment. The battery fluid in battery cells is a corrosive acid solution, which will burn if it comes into contact with bare skin or eyes. Never handle a naked flame or smoke a cigarette near batteries. Be careful with conductive tools near batteries, especially if any battery contacts are exposed. Always disconnect the battery from the truck before removing it. Do not attempt a maintenance procedure unless you have all the necessary tools and equipment required by the task. Use only spare parts approved by the manufacturer. Use only the correct fluids and lubricants. Refer to Section 3.9 Lubricant and fluid recommendations for the recommended lubricants and fluids. Use jacks of suitable design and sufficient capacity to lift the truck. Remember balance when lifting with a jack: position the jack so that the truck’s weight rests evenly on the supports and there is no risk of it overturning. Always secure the truck after lifting it with a jack. Do not work underneath a truck that is supported only by jacks. Always turn off the main power of the truck and release hydraulic pressure before opening any covers. If any cover is open, turn on the main power or use the hydraulic system only if it is necessary for accomplishing the maintenance task. Disconnect the main battery connector unless electrical power is required. Take extreme care when working near electrical components. Even if the main power is switched off, there may be considerable electrical charges in truck components, such as in the batteries and in power capacitors. Note that some components become hot during operation. Allow the truck to cool down after use before opening any covers. Especially the components of the electrical and the hydraulic system can heat up considerably during operation. When larger repairs are involved, for example, when welding, the battery should be disconnected or removed. When welding is necessary, remove any paint or other finishing over a radius
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