Inspect hook and its components before each use and periodically as follows:

• inspect for wear: discard if worn more than 10% of the original dimension at any location

• inspect for distortion: discard if throat opening is more than 10% of original opening or hook latch does not dose properly

• inspect for twisting and bending: discard if bent or twisted more than 10° from the plane of unbent hook

• inspect for cracks and excessive corrosion: discard hooks that display these conditions

• inspect for proper operation and engagement of hook latch and closure of hook opening; also check hook, nut, and screw for security; replace latch as necessary and correct noted deficiencies before using hook

• use only original replacement parts

• the support wall must be flat, without surface defects, of suitable material (C max 0,40%) and thick enough to guarantee a good support (see table)

• electrodes must not be wet

• use electrodes as follow or equivalent
  
  

• welding surfaces shall be cleaned thoroughly of rust, paint, mil-scale, oil, grease, prior to welding

• preheat required to 200 -300°C, maintain throughout entire process

• welding operation shall be carried out continuously

• welding surfaces shall be air cooled after welding; the join shall not be cooled by water; use non-forced air cooling

• there shall be no cracks or porosity on the weld after welding is complete

• make at least two superimposed beads of welding to guarantee correct penetration

• check that the thickness of the welding bead is adequate for the load to be applied (see table)

• welding operation shall be carried out by a qualified welder