1. Whether the rollers, intermediate shafts and bearings, oil cylinder pins and bearings, boom hinge shafts and bearings are worn or not.
2. All parts are filled with some lubricating oil to prolong the service life of the bearing.
3. The oil quality and oil level of the hydraulic oil. The lifting platform is raised throughout the whole process. At this position, the hydraulic ground should be 40-50 mm higher than the bottom of the box. If it is found that the hydraulic oil is dark, sticky or has foreign matter such as grit, it should be replaced in time (32# hydraulic oil).
