During the maintenance or repairs of any vehicle or piece of equipment, the person(s) doing the work must first take steps to assure that no one will inadvertently attempt to operate it (i.e., tag-out, lock-out, disable power source, remove keys, etc.).
During the maintenance or repairs of a piece of equipment or truck which must be performed with apparatus in the opened, raised, or lifted position, the apparatus must be physically blocked, pinned, locked, or otherwise supported to prevent accidental lowering or closure of the apparatus.
Should it become necessary for a person performing repairs or maintenance on a piece of equipment or vehicle to leave even for a short time prior to completing the work, the steps in 3.12.2.a above must be applied.
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