Crane under what circumstances replace the gear should be scrapped

   Check the overhead crane gear has the following defects, should be scrapped Replacement:

1 in the root of the hoisting mechanism of the first gear shaft wear more than 10% of the original thickness of the tooth,hoist gantry crane the rest of the shaft of the gear tooth wear more than the original thickness of the fox;
2 carts (car) the first shaft gear reducer operating agencies wear more than 15% of the original thickness of the tooth,steel crane the rest of the shaft of the gear tooth wear more than the original thickness;
3 open gear wear is greater than 30% of the original tooth thickness;
4 lifting red hot or molten metal, acid,bridge gantry crane explosives, flammable and toxic substances such as crane gear scrapped according to the above criteria accordingly halved;
5 due to the tooth surface and damage the gear pitting face area of ​​more than 30% depth of more than 10% of the tooth thickness;
6 there is a tooth root or a few at the fatigue crack or a broken tooth.