Broderson IC-400-3B, Operation And Maintenance Manual

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CAUTION
Keep hands out of Anti-Two-Block mechanism. Serious injury can result from moving
parts.
18. Avoid two-blocking.
A. Stop raising hoist line before downhaul or hook block strikes boom tip plates.
B. Pay out hoist line while extending boom.
C. Maintain clearance between downhaul weight or hook block and boom tip
while booming down.
D A N G E R
Two-blocking will abruptly stop boom lowering and boom swing, as well as hoist and
extend. If the boom is moving fast, this will cause the load to bounce or swing, which
could cause loss of control of load or tipping.
19.The amount of counterweight supplied with this crane should never be changed.
Unauthorized addition of counterweight in the field to increase lifting ability constitutes a
safety hazard.
20. Always keep crane boom at least 20 feet (6 m) away from any electric power lines of
unknown voltage. If voltage is known, use chart on side of turntable to determine
required clearance distance. When in doubt, contact local power authority.
21. If boom should accidentally contact a power line, keep ground personnel away from
crane. Stay in the crane until the power source is de-energized. Move the crane away
from electrical hazard if this does not cause new hazards. If it is absolutely necessary to
leave the crane,
jump
clear of the crane with both feet together. Hop away from the
crane keeping feet together. The ground surface may be energized.
22. Do not operate outside during thunderstorms. Avoid all lightning strike opportunities.
Consult local weather reports during inclement weather conditions.