SKU: 200-A1010-2012-W
Manufacturer: Spanco
This crane design allows for powered rotation add-on with all models. It also features the following:
Manufacturer's note: NOT designed for lifting, transporting or supporting humans in any way. Failure to follow specified load and mounting limits can end in serious bodily injury and/or property damage.
The bottom pivot bearing carries most of the weight from the crane and its load as the crane rotates (see the shaded gray areas in the accompanying drawing that represent the pivot bearing).
Because of the tremendous load bearing down on this pivot point, a special bronze thrust plate sits between the two pivot bearings, providing greater bearing life and smoother rotation of the crane (the bronze thrust plate is represented by the brown shaded layer in this cross section of the pivot bearing).
As seen from the top in this next drawing, the pivot bearing consists of a sturdy steel bearing core that fits snugly within the outer section of the bearing. Because of the great load this bearing is under, a grease fitting is provided to allow lubrication of the bearing (seen in this drawing and in drawing above) so that rotation is smooth and easy and so that there is minimum wear to the pivot bearing surfaces.
The pivot bearing at the top of the mast must resist side-to-side thrust as it rotates. For this reason, it is also a heavy duty bearing having very low tolerances for a snug yet smoothly rotating fit. From this drawing, you can see that the top pivot bearing lacks a bronze thrust washer or plate.
That is because there is no vertical pressure between the two outer sections of the pivot bearing, therefore, it does not need something to keep the two sections from wearing on one another.
This bearing does, however, have a grease fitting to allow lubrication of the bearing's internal surfaces.
In this final drawing we see the pivot bearing assembly as it appears from overhead. You will also note the mast pivot assembly which consists of the mast top plate that anchors to the pivot bearing assembly, providing a secure, safe connection between the pivot point and the mast.
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