Your fault is that the driver does not start: the following are the reasons and troubleshooting methods

Oil pressure is too low: The pump is faulty, the oil pipeline is leaking, the cooler, filter or strainer is dirty,
                         the oil pressure balance valve or pressure reducing valve is defective
The oil level in the high-level fuel tank is too low: add enough oil
No power:
Seal oil pressure difference is too low: adjust control valve
Oil temperature too low: turn on the heater