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CROSBY TRENCH COVER HOIST RING

WARNING AND APPLICATION
INSTRUCTIONS

HR-500

Trench Cover Hoist
Ring Application / Assembly Instructions

  • Use trench cover hoist ring only with ferrous metal (steel, iron) workpiece. 
  • After determining the loads on each trench cover hoist ring, select the proper size using the Working Load Limit (WLL) ratings in Table 1 (see next page). For proper nut selection, reference trench cover nut welding guidelines (see next page). Nut thickness must equal workpiece thickness. 
  • For proper welding of nut, reference Nut Welding Guidelines on the following page. 
  • Always make sure the nut is free of dirt or contaminants before installation of the Trench Cover Hoist Ring. A clean out tool is available from Crosby. 
  • To install, spin base down flush with workpiece surface and tap one of the lugs on the base with a hammer to tighten; repeat procedure before each use. 
  • Never use spacers between the trench cover hoist ring base and workpiece surface. 
  • Always select proper load rated lifting device for use with trench cover hoist ring. 
  • Attach lifting device ensuring free fit to trench cover hoist ring bail (lifting ring) (Figure 1). 
  • Apply partial load and check proper rotation and alignment. There should be no interference between load (workpiece) and trench cover hoist ring bail (Figure 2). 
  • Always ensure free movement of bail. The bail should pivot 180 degrees and swivel 360 degrees (Figure 4).

 
     WARNING
  • Loads may slip and fall if proper pivot hoist ring assembly and lifting procedures are not used. 
  • A falling load may cause serious injury or death. 
  • Do not use with damaged slings or chain. For inspection criteria see ASME B 30.9. 
  • Use only genuine Crosby bolts as replacements. 
  • Read and understand these warnings and application instructions.

Trench Cover Hoist Ring
Inspection / Maintenance

  • Always inspect trench cover hoist ring parts before use. (Figure 3). Be sure threads on shank and receiving hole are clean, not damaged or worn, and fit properly. A thread gauge is available from Crosby. 
  • Never use trench cover hoist ring that shows signs of corrosion, wear or damage.
  • Never use trench cover hoist ring if bail is bent or elongated. 
  • Do not use parts showing cracks, nicks or gouges. 
  • Always make sure there are no spacers (washers) used between trench cover hoist ring body and the workpiece surface. Remove any spacers (washers) and retighten before use. 
  • Always be sure total workpiece surface is in contact with the trench cover hoist ring body mating surface.  
  • Drilled and tapped hole in the weld-in nut must be 90 degrees to load (workpiece) surface. A welding fixture is available from Crosby.
  • A visual periodic inspection of the nut to workpiece weld should be performed. Check the weld visually, or use a suitable NDE (Non-Destructive Examination) method if required.

Operating Safety 

  • Never exceed the capacity (WLL) of the trench cover hoist ring, see Table 1, next page. 
  • When using lifting slings of two or more legs, make sure the forces in the legs are calculated using the angle from the horizontal sling angle to the leg and select the proper size trench cover hoist ring.

Rev. 1