| 摘要 |
PURPOSE:To continue speed change operation in an urgent time when the main clutch is cut off, by feeding the pressure oil of a hydraulic pump attached to the engine to a hydraulic control valve through converting an electromagnetic valve at the same time. CONSTITUTION:An electromagnetic valve S6 which is closed or opened linking to pressing of a main clutch pedal is furnished between a high pressure pump 43 fixed to the engine E and a hydraulic control valve V. The electromagnetic valve S6 is opened only in an urgent time when a main clutch 55 is cut off,and the pressure oil from an auxiliary hydraulic pump 53 is stopped. And then the pressure oil from the high pressure pump 43 is fed to the oil pressure control valve V and the speed change operation can be continued.
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