There are two common situations in which automatic shifting occurs. One is that while driving, slightly raise the accelerator pedal, the gear jumps back to the neutral position; the other is that when the uphill load increases, the gear immediately jumps back to the neutral position. In this case, if you re-hang If the block is not hung up, it is easy to form a slope and a serious accident occurs.
The reasons are as follows:
(1) The spring of the fork spring is weakened or broken, so that the self-locking position fails;
(2) The fork locking screw is loose, the steel ball of the fork shaft positioning groove or the self-locking device is worn, and the shift lever cannot be reliably positioned;
(3) The effective stroke of the fork is small or the fork is bent and deformed, so that the gear meshing is not in place, and it is easy to disengage after being stressed;
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(4) The end face of the fork is seriously worn, the gap between the end face of the fork and the sliding gear ring groove is too large, and the sliding gear is easy to shift forward and backward and automatically disengage;
(5) The gear working surface is worn to be tapered, so that the gear meshing clearance is too large, and the axial thrust is easy to occur, so that the sliding gear is disengaged;
(6) The spline of the gear and the shaft wears, the keyway gap is too large, so that the gear swings in the transmission, and the sliding gear is easily separated from the meshing position;
(7) Bearing wear, loose bearing, bearing and shaft inner ring slip, bearing and box seat hole outer ring slip, the axial clearance is too large, the gear shaft is tilted and the gear shaft is displaced, resulting in gear Automatically disengages after the force.
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