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Section 1 Maintenance
SCC1000C Crawler Crane — Maintenance Manual
12. Never attempt to pull chain slings from under loads forcefully or let the load roll on the sling.
13. Chain slings shall be handled gently and carefully. It is prohibited to ing, drop, or drag chain slings on
the oor to avoid any deformation, supercial or internal damage.
14. Chain sling inspection criteria
1) Permissible wear of chain slings shall not exceed 10% of the chain link bar diameter or the thickness
of any attachment, any chain with wear greater than that value must be withdrawn from service.
2) Discard chain slings when torsion of master link exceeds 10 degree measured from the untwisted
plane of master link.
3) Chain slings must be removed from service when cracks, bends, or twists appear in any part of the
chain sling, and when chain links get stuck and cannot hinge freely with adjacent links and such a
problem cannot be rectied.
4) Permanent stretch of chains and single links shall not exceed 5% of the original dimension (See Fig.
TY0222).
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15. Hook removal criteria
1) Cracks.
2) Hazardous cross-sectional wear or corrosion
reach 5% of the original dimension.
3) The torsion angle of hook body exceeds 10
degrees.
4) Hook bent opening increases by 10% of the
nominal dimension (See Fig. TY0223).
16. It is prohibited to repair or re-process (including
welding, heating, heat treatment, and surface
chemical treatment by chemical methods) the
riggings.
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