| 摘要 |
The invention relates to a hydraulic servo-system switchable to manual operation, which, in case of hydraulic installation failure, switches the transmission from the hydraulically assisted circuit to the manual operation circuit. According to the invention, the hydraulic servo-system switchable to the manual operation synchronously performs the functions of providing a fixed supporting point for the inlet lever (LI), short-circuiting the chambers (U1 and U2) of the power cylinder (CF) upon return travel, and locking the control lever (LC) in the neutral position, the system for switching to manual operation (SCM) being made as a unique assembly comprising a bushing (13) having a drawer (14), which is continued at one end by a piston (15) and a plug (16) and ends with a female thread accomodating a lug head (17), while the other end of the rod of drawer (14) is provided with a plug (18) and a cup (20) provided with a spring (19) therebetween, and closed with a cover (21).
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