(1) The clutch is not fully retracted (2) The shift lock rod is too long (3) The shift lever drive shaft is severely worn (4) the engagement end surface and toothed end surface are worn or damaged
(1) Troubleshooting using the clutch troubleshooting method (2) Reduce the length of the shift lock rod accordingly shortens the length of the speed change blocking rod (3) Replacing the speed range lever (4) Replacement or repair