| 摘要 |
PURPOSE:To enable to prevent shortage of lubricating oil in an auxiliary pressure oil pump and adhesion of an oil pump controlling hydraulic valve, by interchanging operation of a service pressure oil pump and the auxiliary pressure oil pump automatically. CONSTITUTION:By feeding current to a solenoid of an electromagnetic switch 88Q-B, a solenoid of a keep relay 88Q-X is energized and a contact (b) of the keep relay 88Q-X is closed. Resultantly, current is passed to a solenoid of an electromagnetic switch 88Q-A and a three-phase contact of the electromagnetic switch 88Q-A is closed, so that a motor 88M-A for driving a pressure oil pump 803-A is started. Thus, the pressure oil pump 803-A is set into operation and pressure oil is supplied to a pressure oil tank. Therefore, it is enabled to prevent shortage of lubricating oil in an auxiliary pressure oil pump and adhesion of a pressure oil pump controlling hydraulic valve. |
