| 摘要 |
An upper boom compensation system for an aerial device having an articulating boom assembly. The lower boom is raised and lowered by a special double cylinder having two pistons and a common piston rod. A hydraulic circuit is arranged to transfer fluid between the lower boom cylinder and the upper boom cylinder in a manner to raise and lower the upper boom correspondingly to raising and lowering of the lower boom. The upper boom can also be controlled independently of the lower boom.
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