| 摘要 |
PROBLEM TO BE SOLVED: To realize a condition of oil which is suitable for use early by turning off all electrical signals to a plurality of solenoid operation pressure adjusting valves which are engaged in the control of a transmission and operating these valves sequentially when oil in the transmission is cold when a machine is driven. SOLUTION: When it is judged that a shift lever 24 is at a parking position based on a position detection signal of the shift lever in a controller 28, operation conditions of oil used in a transmission (temperature, viscosity, etc.) are detected by an oil operation condition sensor 30, and an indication lamp 35 is lit if the operation conditions of the oil are below predetermined operation values. Moreover, all electrical signals to solenoid operation pressure adjusting valves 40A to 40H engaged in the control of a plurality of clutches 38A to 38H of the transmission are turned off. After that, the pressure adjusting valves 40A to 40H are sequentially operated based on the operation conditions of the oil and a predetermined period of time to return a system to normal operation after the indication lamp 35 is lit. |
