22
Item Method Discard limit or criteria Action
Top and
Bottom
Hooks
Check the deformation of the
Hook neck visually.
• The neck should not be deformed or twisted
beyond the discard limit.
Replace the Top Hook
Set or the Bottom Hook
Complete Set.
Rotate Hook. • Should rotate smoothly. Replace the Top Hook
Set or the Bottom Hook
Complete Set.
Latch Move Latch for a few times.
• Should securely close the hook throat.
• Should move smoothly.
Replace Latch.
Load
Chain
Check abrasion visually and
using calipers.
• Check abrasion of Load Chain by measuring
the total length of 5 links of chain.
However, when the chain diameter is
excessively worn with visual check, replace
the Load Chain.
• For measuring control, measure the chain
diameter, referring to the limit value in the
above table.
Needle tip calipers are needed to measure
pitch length of 5 links and the wire diameter.
Replace the Bottom
Hook Complete Set.
Neck
Pitch length for 5 links
d
Do not use Hook without Latch.
Failure to do so may result in death or severe
injury.
Carefully check the position, especially where
the Load Chain engages with the Load Sheave.
NOTE
Rated
load (t)
Pitch length for 5 links (mm) Chain diameter (d)mm
Standard Limit
Nominal
diameter
Limit
0.25 45.5 46.8 3.2 2.9
0.5
60.5 62.3 4.3 3.9
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