ON A TRX420 FA (2013). The issue hit me suddenly. The gears were skipping from 2 to 4/5. Greased the reduction box. Now she decides its time to blow fuses. The fuse blows when we change gears in ESP moving up. How stiff should the shift control motor be. Should it be smooth or coarse. Please if anybody can give me advice where to start looking or what the issue is.