一辆解放奥威CA4182P21K2车,采用RT—11509C变速器,累计行驶7500km,变速器出现无规律的断续异响,异响类似增压系统泄漏的哨声。在行驶过程中当故障出现时,无论是空档滑行或以任一档行驶,异响一直存在,此时如将变速器置于空档,让发动机怠速运转并踩下离合器踏板,异响消失。正常行驶过程中若 A liberation of Aowei CA4182P21K2 car, the use of RT-11509C transmission, a total mileage of 7500km, transmission irregular intermittent abnormal sound, abnormal noise is similar to the pressurized turboprop whistle. In the process of driving when the fault occurs, whether it is free-wheeling or driving in any gear, abnormal noise has always existed, this time as the transmission in neutral, let the engine idle and step on the clutch pedal, abnormal noise disappears. If normal driving process