... drum drive hook unit up or down. Lifting height H = 6m, when Crane capacity <10t, we should use a elastic coupling to ... rope guide would prevent steel wire rope mess aroundWhen H ≥ 9m, crane ≤ 10t; H ≥ 6m, weight ≥ 12.5t, we should add an intermediate ... and a rigid coupling.When H ≥ 9m, from the weight ≤ 10t; H ≥ 6m, when equipped with a crane ≥ 12.5t, we should add ...