When the outdoor elevator vibrate or tremble during operating, the reasons may be:
1. The hoists roller bolts looseness;
2. The meshing gap of the gear and rack of the elevator is too large.
3. The gap between the back wheel and the racks back is too large.
4. The gear and rack meshing is lack of lubricating oil.
The solutions of man and material lifts vibrating and trembling are as follows:
1. Fastening bolts;
2. readjust the gap;