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东风4型机车联合调节器设计工作油冷却较困难，只能采取自然冷却。尤其在夏季，当柴油机长时间工作后，工作油的温度较高，在热机状态下再起机，由于起动电动机驱动柴油机的转速低（达到最低发火稳定转速时约为288r／min）。加之工作油的粘度下降（内燃机车专用调速器的油协议?
Dongfeng 4 locomotive joint regulator design work oil cooling more difficult, can only take natural cooling. Especially in the summer, when the diesel engine is working for a long time, the temperature of the working oil is high, and the engine restarts under the condition of the heat engine. Since the starting motor drives the diesel engine to rotate at a low speed (about 288 r / min when the minimum ignition steady speed is reached). Coupled with the decline in the viscosity of the working oil (diesel locomotive governor oil agreement?