lift hoist oil spill occurred in the use of reason analysis

lift hoist has been widely used in various high-altitude operations, some customers will be reflected in the course of the lift hoist oil spill situation occurs, what causes it? Remedial measures, what does?
First, the  lift hoist  caused by the frequent use of the aging
1, the ring after long-term use, friction and wear will make it lose sealing performance, or aging rubber and other materials to make seals completely damaged, as well as due to wear between the shaft and the sleeve, so that the gap between the bore axis increases, causing leakage .
2, tubing use plastic pipes, pipe joints use plastic joints, after long-term use of the future, there will be material aging, resulting in tubing and fittings rupture, causing oil leakage.
Second, the lift hoist did not go through rigorous scientific design
1, there is no reasonable oil return path, so back to the oil spill caused by poor equipment.
2, casting box, the quality does not comply, appear blisters, pores, cracks, loose tissue and other defects, but not in time, the device during use, these defects is often the root cause of oil spill equipment.
3, due to a combination of housing and cover surface machining, flatness tolerance and surface roughness serious too coarse, or residual stress caused by excessive deformation, so that combination of surface fitting is not tight, loose or damaged fasteners phenomenon, often can cause leakage.
4, the seal has not been rigorous checks, or improper seal dimensions, matched with the seal caused by the irrational structure of the device leakage occurs.
5, the seal or the conditions of use are incompatible, resulting in equipment leakage.
Three, unauthorized access or improper maintenance
lift hoists problems, should be promptly requested professional maintenance staff are not allowed to repair, but can not continue to operate if a problem occurs, prevention efforts should be prepared in advance.
Summary: lift hoist at work, as a whole, any part of the problem, will result in an unsafe risk, so it is vitally important to do preventive work in advance, so the problem should be timely  Hoist equipment   to find professionals to help solve.