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00 Index and foreword
Foreword, safety and general information
part. Do not work with any part still raised by the
hoist or crane.
• When removing a part which is under internal
pressure or under reaction force of a spring,
always leave 2 bolts in diagonal positions.
Loosen those 2 bolts gradually and alternately to
release the pressure, and then remove the part.
• When removing components, be careful not to
break or damage the electrical wiring. Damaged
wiring may cause a fire.
• When removing piping, stop the fuel or oil from
spilling out. If any fuel or oil drips onto the floor,
wipe it off immediately. Fuel or oil on the floor
can cause you to slip and can even cause fires.
• As a general rule, do not use gasoline to wash
parts. Do not use it to clean electrical parts, in
particular.
• Be sure to assemble all parts again in their
original places. Replace any damaged parts and
parts which must not be reused with new parts.
When installing hoses and wiring harnesses, be
sure that they will not be damaged by contact
with other parts when the machine is operated.
• When installing high pressure hoses and tubes,
make sure that they are not twisted. Damaged
hoses and tubes are dangerous, so be
extremely careful when installing hoses and
tubes for high pressure circuits. In addition,
check that connections of them are correct.
• When assembling or installing parts, always
tighten them to the specified torques. When
installing protective parts such as guards, or
parts which vibrate violently or rotate at high
speed, be particularly careful to check that they
are installed correctly.
• When aligning 2 holes, never insert your fingers
or hand. Be careful not to get your fingers
caught in a hole.
• When measuring hydraulic pressure, check that
the measuring tools are correctly installed.
• Take care when removing or installing the tracks
of track-type machines. Since the track shoe
may separate suddenly when you remove it,
never let anyone stand at either end of the track
shoe.
• If the engine is operated for a long time in a
closed place which is not ventilated well, you
may suffer from gas poisoning. Accordingly,
open the windows and doors to ventilate the
place well.
Precautions for slinging work and making
signals
• Only one appointed worker must make signals
and co-workers must communicate with each
other frequently. The appointed signaler must
make specified signals clearly at a place where
he is well seen from the operator's seat and
where he can see the working condition easily.
00-18
The signaler must always stand in front of the
load and guide the operator safely.
• Never stand under the load.
• Do not move a load over a person.
• Never stand on the load.
• Do not prevent the load from swinging or
falling down by holding it simply with the
hands.
• The sling workers and assistant workers
other than the guide must move to a place
where they are not caught between the load
and materials or equipment on the ground or
hit by the load even if the crane starts
abruptly.
• Check the slings before starting sling work.
• Keep putting on gloves during sling work. (Put
on leather gloves, if available.)
• Measure the weight of the load by the eye and
check its center of gravity.
• Use proper sling corresponding to the weight of
the load and method of slinging. If too thick wire
ropes are used to sling a light load, the load may
slip and fall.
• Do not sling a load with one wire rope alone. If it
is slung so, It may rotate and may slip out of the
rope. Install two or more wire ropes
symmetrically.
Slinging with one rope may cause turning
k
of the load during hoisting, untwisting of
the rope, or slipping of the rope from its
original slinging position on the load,
which can result in a dangerous accident.
• Hanging angle must be 60° or smaller as a rule.
• When hanging a heavy load (25 kg or heavier),
the hanging angle of the rope must be narrower
than that of the hook.
a When hoisting a load with 2 or more ropes,
the force subjected to each rope increases
with the hanging angle. The figure below
shows the variation of allowable load in kg
when hoisting is made with 2 ropes, each of
which is allowed to sling up to 9.8 kN {1,000
kg} vertically, at various hanging angles.
When the 2 ropes sling a load vertically, they
can sling up to 2,000 kg of total weight. This
weight is reduced to 1,000 kg when the 2
ropes make a hanging angle of 120°. If the 2
ropes sling a 2,000 kg load at a lifting angle
of 150° each rope is subjected to a force as
large as 39.2kN {4,000 kg}.
HB215LC-2
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