一辆延安SX-2150型柴油牵引车,在未起动前,踩离合器时非常沉重,但离合器能分离开,离合器踏板能回到原位。当起动后不长时间,离合器踏板就开始慢慢下沉,直到碰到驾驶室底板,放松踏板后踏板不能回位,导致离合器不能结合,汽车无法行驶,有时只好靠另一个人用绳子拉着离合器踏板行驶 A Yan’an SX-2150 diesel tractor, before starting, stepped on the clutch is very heavy, but the clutch can be separated, the clutch pedal can be returned to its original position. Not long after the start, the clutch pedal began to slowly sink until it hit the cab floor, the pedal can not be released after the release of the pedal, resulting in the clutch can not be combined, the car can not drive, and sometimes had to rely on another person with a rope Clutch pedal travel