Hydraulic lifting platform weakness is mainly because the torque converter hydraulic oil, insufficient and improper backpressure regulator. At this point you should check the torque converter oil quality (whether misuse hydraulic

　　transmission oil), dosage, check the torque pressure regulators, back pressure valve and set pressure value.

　　Hydraulic lifting platform powershift failure mainly because fast return valves, valves, power shift valve, valve appears stuck, internal leakage and oil pollution. Everyone should check valve stuck causes and accordingly exclude or replace hydraulic oil filter, check the cooler is faulty, check the hydraulic oil quality brands.