Maintenance; Allowable Limits For Load Chain And Hooks; Load Chain; Hooks (Top And Bottom) - Jet JLH Series Operating Instructions And Parts Manual

Maintenance

The lever hoist should be stored in a clean, dry
environment. Clean and oil the hoist before
storage.
Hoists that are installed out-of-doors should be
covered or brought inside when not in use.
Periodically apply a light coat of 30 weight oil to
the load chain. Also lubricate the safety latches
and the bearings in the hooks.
Allowable Limits for Load
Chain and Hooks

Load Chain

Carefully inspect the entire load chain. As
illustrated in Figure 9, measure five consecutive
links with calipers to find the length, Compare
the results with the table in Figure 9. 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.

Hooks (Top and Bottom)

Replace the hook when the distance between
indicator points – "A" in Figures 10 and 11 – is
wider than the limits given in the table.
Never heat treat the hook or attach anything to
the hook by welding.
"A" Dimension
Hoist
Normal
Capacity
(mm)
9 ton 54.1
Figure 11
Capacity
Capacity
"A" Dimension
Replace if ≥
57
12
Hoist 5 Links Normal
(mm)
0.8 ton 79
1 ton 79
1.6 ton 100
2.5 ton 124
3.2 ton 141
6.3 ton 141
9 ton 141
Figure 9
"A" Dimension
Hoist
Normal
(mm)
0.8 ton 41.8
1 ton 49.9
1.6 ton 52.3
2.5 ton 59.9
3.2 ton 62.7
6.3 ton 84.6
Figure 10
5 Links Limit
Replace if ≥
81.3
81.3
102.9
127.
145.1
145.1
145.1
"A" Dimension
Replace if ≥
44
52.5
55
63
66
89