Load And Wear Limits; Alloy Steel Chain; Hooks (Top And Bottom) - Jet S90 Series Operating Instructions And Parts Manual

9.0 Load and wear limits

9.1 Alloy steel chain

Carefully inspect entire load chain. As illustrated in
Figure 15, measure five consecutive links with
calipers to measure the length. Check every three
feet and especially where excessive wear is
indicated. Any load chain that shows noticeable
deformation or heat influence must be replaced
with a new one. Never extend load chain by
welding a second piece to the original.
Figure 15
5 Links Normal
Capacity
(mm)
0.5 ton 75
1 ton 90
1.5 ton 120
2 ton 120
3 ton 120
5 ton 150
10 ton 150
Table 2
5 Links Limit
Replace if:
77.3
92.6
123.4
123.4
123.4
154.3
154.3
12

9.2 Hooks (top and bottom)

See Figure 16.
Replace hook when "A" measurement is equal to
or greater than the "A" Limit in the table below.
Never heat treat the hook or attach anything to the
hook by welding.
Figure 16
Load
Capacity chain
column
0.5 ton 1
1 ton 1
1.5 ton 1
2 ton 1
3 ton 2
5 ton 2
10 ton 4
Table 3
A
B
"A" "A" "B"
Norm Limit Norm
1.36" 1.44" –
1.77" 1.88" –
1.86" 1.97" –
2.05" 2.17" –
2.45" 2.60" –
3.06" 3.24" –
– – 2.52"
"B"
Limit
–
–
–
–
–
–
2.67"