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If the 2nd boom is raised, the following movements are
locked:
• 1st boom down/up
• 2nd boom down
• extension boom out
If the 2nd boom is down, the following movements are
locked:
• 1st boom up
• 2nd boom up
• extension boom out
• 1st boom down (certain crane types and cases)
Lifting the load
Make sure that you always have the work in clear view. If you cannot see the load properly, you
could cause a fatal accident or serious damage.
Sling length
Always attach the load using the shortest possible sling.
The angle between the legs of the sling must not exceed
120°. The maximum working load, (usually known as the
working load limit (WLL) in standards) of a multi-legged
sling for general purposes, is calculated by multiplying the
WLL of a single leg by a mode factor (refer to the table).
Max angle to the vertical of any
sling leg (degrees)
Mode factor two
legged sling
Mode factor three and
four legged sling
0-45
1.4
2.1
45-60
1.0
1.5
If the angle between the legs of the sling is more than 90°, do not hang the slings directly on the
hook. Use a ring hanging from the hook to attach the sling.
Working close to the load
Always try to lift the load with the extension boom retracted,
however not completely. The crane then has the greatest
lifting capacity. Place the vehicle as close as possible to the
load.
>120º
Safety precautions and warnings
20
HIAB 410K PRO