A small four-wheel tractor, after adjusting the clutch clearance and pedal free travel, the clutch can sometimes be separated, sometimes cannot be separated, and there is a phenomenon of continuous break and disconnection of the lever. After disengaging the clutch, it was found that there were severe wear pits on the three lugs on the pressure plate and on both sides of the three grooves on the inner wall of the driven pulley. Therefore, when the clutch is engaged, under the action of the clutch spring, the lug on the platen is sometimes held firmly in the pit. When the clutch pedal is depressed at this time, the pressure plate will not move, the clutch cannot be disengaged, and the separation lever is easily broken.
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