When an ISUZU aerial work platform truck 's lifting platform fails to lift, the cause is usually related to the hydraulic system. The following analysis outlines common hydraulic problems and their potential solutions.
The main cause of lifting failure is hydraulic circuit blockage. This occurs when hydraulic oil cannot flow properly into the cylinders due to blockage in the lines. Blockages typically occur in valves such as check valves, directional control valves, or regulating valves. Possible causes include contaminated hydraulic oil containing solid particles, which can cause valves to stick or become blocked; mechanical failures preventing valves from opening; or electrical faults in solenoid valves or control valves.
Another common problem is insufficient hydraulic system pressure. Low pressure can be caused by a damaged or improperly set safety valve, especially after maintenance if not properly readjusted. Internal or external leaks in the hydraulic system, such as leaks in pipes or cylinders, can also cause a pressure drop. When the pressure is too low, the platform cannot lift, especially under load.
