47
CAUTIONS ABOUT HIGH TEMPERATURE OIL WHEN OPERATING CRANE
When hydraulic oil temperature exceeds 80 °C, high pressure
hoses and seals can be damaged by heat, and it may cause
burning to skin from oil spray.
If temperature of hydraulic oil exceeds 80 °C, stop the
operation and wait until the oil cools down.
Hook raising/lowering operation at high lift or continuous
crane operation with the accelerator pedal depressed will
increase the hydraulic oil temperature. Take special care
during such operation.
CAUTIONS WHEN OPERATING WINCH
• Do not allow persons to enter the area below the hoisted
load.
• When hoisting a load, always stop once at the “takeoff”
position where the hoisted load leaves the ground. Check
subjects such as load stability and load force, then hoist up
the load.
• Do not pull laterally, pull toward you or hoist diagonally.
Such attempt may cause the crane to trip or get damaged.
• Overwinding of the hook block may result in collision with
the boom, snipping the wire ropes and causing the hook
block and load to fall and may lead to serious accidents.
Take care not to overwind the hook block.
• Be careful to prevent the wire rope and/or hoisted load from
contacting an obstacle such as a tree or steel when hoisting
a load.
If caught by an obstacle, do not forcibly wind up the hoist
load, but untangle the caught part before winding up.
• Do not use the winch drum wire that is wound up irregularly.
If wound up irregularly, not only the wire rope gets damage
and shortens the lifetime, but it may snip and causes serious
accidents.
Observe the following precautions to avoid wire rope from
winding up irregularly.
• Do not let the hook block touch the ground.
• When lowering the hook block for long distance for
underground works, be sure to leave more than 3 turns of
the wire rope on the winch drum.
• If the wire rope is twisted and causes the hook block to turn,
fully eliminate the twist before work.
See “OPERATION 5.2 CORRETIVE ACTIONS AGAINST
TWISTED WIRE ROPE”.
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