| 摘要 |
The herein described system is used for mechanically extending and retracting a semi trailer's/chassis landing gear to support, raise or lower the trailer or chassis. Such system utilizes the existing apparatus minus the manual “crank” currently attached to the shaft which, in turn, is attached to the gear reduction box assembly. The manual crank is replaced with an “adapter” on the outboard shaft. This adapter is then attached as needed to a pneumatic, hydraulic, or electrically powered device to turn the shaft thereby mechanically moving the landing/leveling legs into the desired position. The pneumatic device is powered by a connection inherent to the system attached to the semi trailer or tractor's air brake line. The hydraulic device may be powered by an external hydraulic system. The electrical device may be DC battery powered or attached to an inverter in/or on the tractor.
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