| 摘要 |
PURPOSE: A hydraulic circuit of lift is provided to prevent operation defect due to foreign matter deposition based on reduction of fixing places corresponding to hydraulic component by simplifying a passage formed inside of a valve block controlling supply of actuating oil and to reduce processing process of valve block. CONSTITUTION: Part of actuating oil discharged from a hydraulic tank caused by driving of a hydraulic pump during motor (10) driving passes through a valve block. A landing of four column type is lifted and at the same time, actuating oil is fed to a pair of secondary hydraulic cylinders(13,14) each for driving a two-step jack fixed on the landing to be foldable for enabling inspecting and repairing a vehicle tire and wheel alignment. An electric signal is fed to an opposed side of valve springs(16a,17a) of secondary switching valves(16,17) arranged at actuating oil drain holes(25,26) communicated in parallel via communication holes. The actuating oil discharged from a hydraulic pump(11) drives the two-step jack.
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