| 摘要 |
PROBLEM TO BE SOLVED: To provide a foot-operated travel operating tool with a simple/inexpensive composition having the same functions as a manual travel operating tool for easily carrying out complex operation, such as making a body move/travel while operating (maneuvering) a working machine attachment connected to the body, in a working vehicle such as a crawler tractor equipped with the manual travel operating tool coordinating with a two-pump/two-motor type hydrostatic continuously variable transmission for travelling. SOLUTION: The manual travel operating tool 8 coordinating with the travelling hydrostatic continuously variable transmission 21 is made to coordinate with discharge amount control valves V1, V2 of servo mechanisms S1, S2 for controlling cam plates of two hydraulic pumps 20L, 20R, and the foot-operated travel operating tools 32L, 32R are provided separately from the manual travel operating tool 8. The foot-operated travel operating tools 32L, 32R are made to operate in a cam plate control circuit of the servo mechanisms S1, S2 for controlling the cam plates to allow the travel operation by the foot-operated travel operating tools 32L, 32R. COPYRIGHT: (C)2009,JPO&INPIT
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