Off-road forklifts, also known as 4WD off-road forklifts, multi-function off-road forklifts, field off-road forklifts, loading and unloading off-road forklifts, stacking off-road forklifts 4WD off-road forklifts fault diagnosis purpose ① Timely and correctly diagnose, prevent or fail, and provide necessary guidance on the operation of equipment, and improve the reliability, safety and effective operation of equipment sex, with a view to putting the fault Reduced to a low level ② Ensures that the equipment exerts great design capabilities. Formulate a reasonable inspection and maintenance system so as to fully exploit the potential of equipment under permissible conditions, extend the service life and service life, and reduce the use of equipment throughout the life cycle. ③ Provide data and information for equipment structural transformation, optimal design, rational manufacturing and production processes through detection, fault analysis, performance, etc. Overall, equipment fault diagnosis should not only ensure the safe and reliable operation of equipment, but also obtain greater economic and social benefits.