There are two cases of abnormal noise in the gearbox: one is abnormal noise in the neutral position; the other is abnormal noise when shifting while driving.
The reasons are as follows:
(1) The gear oil quantity is insufficient or the gear oil quality is too poor;
(2) The gear tooth surface is seriously worn, so that the meshing clearance is too large;
(3) Fatigue spalling or collapse of the gear teeth;
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(4) The intermediate shaft and the second shaft are excessively worn, or the splines in the spline shaft and the gear are worn seriously, the clearance is too large; the shaft is bent or the lock on the shaft is loose;
(5) The bearing is loose or the cage is damaged;
(6) Contact or rubbing of the non-working part of the fork;
(7) Instead of replacing the gears in pairs, the new gears are replaced individually.
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