straddle semi electric stackers drive wheel speed reduction or drive motor serious overload is mainly because the battery voltage is too low or the pile head contact resistance is too large, cleaning the pile head can reduce the resistance, the battery voltage is low need to replace the new battery; commutator piece Caused by intercrystalline short circuit between the chip will cause this failure; cause this failure due to improper adjustment of the motor brake with the brake motor and drive head gear box and the lack of lubrication or bearing base block, the motor armature short circuit. To solve these problems: Clean the commutator, adjust the brake clearance, check the cleaning and re-fill the oil, remove the card group now and replace the motor.