Chain And Hooks - Tiger TR7 Instruction Manual

4.

Chain and Hooks

The hooks and load chains are made of special alloy-steels and are precisely heat -treated. Never weld or heat-treat them
again.
Load Chain
The load chains are exceptionally long -wearing, but wear is unavoidable and certain conditions will cause wear and corrosion
that will lessen the strength . Insp ect the load chain for sufficient lubrication , mechanical damage and check for external
defects, deformations, superficial cracks, wear and corrosion marks.
Round steel section chains must be replaced when the original nominal thickness ´d´ on the chain l ink with the worst wear
has been reduced by more than 10% or when the chain has elongated to a value greater than the discard levels shown in the
tables below. There are two alternative tables for either measuring the chain over 21 links or measuring the c hain over 7
pitches . Chain should be clean, free of twists and pulled taut before measuring.
Measuring the diameter of the chain
d =
m
Replace the chain if d
Measuring over 21 links
Capacity (tonnes)
0.5/1.0
1.5/3.0t twin
2.0/5.0
Measuring over 7 pitches
Capacity (tonnes)
0.5/1.0
1.5/3.0t twin
2.0/5.0
Unit 1, eld Industrial Estate,
Willowburn Avenue,
ALNWICK, NE66 2DG
Email: info@ gerli ing.com
d + d
1 2
2
0.9 × d, where d is the normal diameter of the chain wire .
m
Discard if Diameter of
Diameter of Chain
Wire dØ (mm)
Chain Wire dØ (mm)
6.3 5.7
7.1 6.4
8.0 7.2
Discard if Diameter of
Diameter of Chain
Wire dØ (mm)
Chain Wire dØ (mm)
6.3 5.7
7.1 6.4
8.0 7.2
Discard if 21 links
Dimensions of Chain
(mm) (dØ x P)
(mm)
6.3 × 19 421 .6
7.1 × 21 467 .4
8 × 24 533 .4
Dimensions of Chain
Discard if L (mm)
(mm) (dØ x P)
6.3 × 19 137.0
7.1 × 21 151.5
8 × 24 173.5
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