To solve the problem wherein there is a danger that a vehicle is suddenly decelerated or accelerated when a hydraulic force to a clutch is lowered by generation of abnormality in a hydraulic clutch for operating output rotation of a continuously variable transmission or in an oil passage, to which the hydraulic clutch is connected, because the continuously variable transmission is set in the normal rotation output condition when electricity is turned off, in regard to the continuously variable transmission for smoothly changing the rotating speed of a crawler from normal rotation to reverse rotation by changing the crimping force of the hydraulic clutch with the simple operation for evenly changing the current-carrying quantity to a solenoid valve.
The oil passage, to which the hydraulic clutch is connected, is provided with a pressure sensor, and when the pressure sensor detects lowering of the pressure in the oil passage, an alarm lamp and a buzzer are operated, and wile electrical continuity quantity to the solenoid valve is increased to decelerate a vehicle in response to the progressing direction, or electrical continuity is immediately stopped to stop an engine.
UEJI HITOSHI
ISHIDA TOMOYUKI
FUJIWARA JUNICHI
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