JET Tools JLP-150A-20SH User Manual - Page 12

Overload Protection, Point Hooks, Maintenance, Wear Limits, Load Chain Wear Limits

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Overload Protection Some models of the JLP Lever Hoist have overload protection in the form of a slip clutch (these are identified by "WO" in the model number). The slip clutch is effective between 1.25 to 1.55 times the rated hoist capacity. The slip clutch will allow the lever handle to rotate without lifting the load, if the load is too heavy for the hoist. The slip clutch has been pre-adjusted at the factory and should not require any adjustment by the user. If future adjustment or repair to the slip clutch should ever be needed, this must be done by qualified personnel. Point Hooks Point or "shipyard" hooks are available for your JET lever hoist, in 1-1/2 ton and 3 ton load sizes. They are available in both upper and lower hook styles. Point hooks are used in the metal and ship building industries, and are designed for positioning steel plate and fixtures before welding. 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. Wear Limits Load Chain Wear Limits Carefully inspect the entire load chain. As illustrated in Figure 12, measure five consecutive links with calipers to find the length, Compare the results with the table in Figure 12. 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. Hoist Capacity 1/4 ton 1/2 ton 3/4 ton 1-1/2 ton 3 ton 6 ton 5 Links Normal (mm) 2.36" 2.36" 3.54" 4.72" 5.91" 5.91" Figure 12 5 Links Limit Replace if ≥ 2.433" 2.433" 3.629" 4.838" 6.058" 6.058" Hook Wear Limits (Top and Bottom) Replace the hook when "A" in Figure 13 is wider than the "Throat Opening Limit" shown in the accompanying table. Never heat treat the hook or attach anything to the hook by welding. Capacity 1/4 ton 1/2 ton 3/4 ton 1-1/2 ton 3 ton 6 ton Standard Throat Opening (A) 1.40" 1.38" 1.46" 1.85" 2.46" 3.07" Figure 13 Throat Opening Limit (A) 1.47" 1.45" 1.54" 1.95" 2.59" 3.23" 12

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12
Overload Protection
Some models of the JLP Lever Hoist have
overload protection in the form of a slip clutch
(these are identified by “WO” in the model
number). The slip clutch is effective between 1.25
to 1.55 times the rated hoist capacity.
The slip clutch will allow the lever handle to rotate
without lifting the load, if the load is too heavy for
the hoist. The slip clutch has been pre-adjusted at
the factory and should not require any adjustment
by the user. If future adjustment or repair to the slip
clutch should ever be needed, this must be done
by qualified personnel.
Point Hooks
Point or “shipyard” hooks are available for your
JET lever hoist, in 1-1/2 ton and 3 ton load sizes.
They are available in both upper and lower hook
styles.
Point hooks are used in the metal and ship building
industries, and are designed for positioning steel
plate and fixtures before welding.
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.
Wear Limits
Load Chain Wear Limits
Carefully
inspect the entire
load chain. As
illustrated in Figure 12, measure five consecutive
links with calipers to find the length, Compare the
results with the table in Figure 12. 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.
Hoist
Capacity
5 Links Normal
(mm)
5 Links Limit
Replace if
≥
1/4 ton
2.36”
2.433”
1/2 ton
2.36”
2.433”
3/4 ton
3.54”
3.629”
1-1/2 ton
4.72”
4.838”
3 ton
5.91”
6.058”
6 ton
5.91”
6.058”
Figure 12
Hook Wear Limits (Top and Bottom)
Replace the hook when “A” in Figure 13 is wider
than the “Throat Opening Limit” shown in the
accompanying table.
Never
heat treat the hook or attach anything to the
hook by welding.
Capacity
Standard
Throat
Opening
(A)
Throat
Opening
Limit
(A)
1/4 ton
1.40”
1.47”
1/2 ton
1.38”
1.45”
3/4 ton
1.46”
1.54”
1-1/2 ton
1.85”
1.95”
3 ton
2.46”
2.59”
6 ton
3.07”
3.23”
Figure 13