Hello greetings ..
you have to make a routine rvision, (visual) to verify that it does not find loose screws, or loose pieces, with the help of a lamp fix at the time of acting the pedal that the necklace slips without problems, many of the noises are probably proven by dirt that results in the pieces, if you fail to see something abnormal, the following is to demolish the transmission and see Clutch (Disco and Collarin press) also the guide where the项链滑动是否改变了变形。
我希望找到你。