Advertisement
FOREWORD
HOISTING INSTRUCTIONS
Hoisting
★ If a part cannot be smoothly removed from the machine
by hoisting, the following checks should be made.
1.
Check for removal of all bolts fastening the part to the
relative parts.
2.
Check for existence of another part causing interface
with the part to be removed.
Making Signs
1.
Only one appointed worker must make signs and
coworkers
must
communicate
frequently.
2.
The appointed sign maker must make specified signs
clearly at a place where he is well seen from the
operator's seat and where he can see the working
condition easily.
3.
The sign maker must always stand in front of the load
and guide the operator safely.
•
Do not stand under the load.
•
Do not step on the load.
Precautions
Precautions for Sling Work
1.
Check the slings before starting sling work.
2.
Wear gloves during sling work. Use leather gloves, if
available.
3.
Measure the weight of the load visually and check its
center of gravity.
4.
Use a proper sling according to the weight of the load
and method of slinging. If the wire ropes you use are too
thick when slinging a light load, the load may slip and
fall.
WA250-6
5.
00
00
6.
with
each
other
00
00
7.
8.
HOISTING INSTRUCTIONS
Do not sling a heavy load with one rope alone, but sling
with two or more ropes symmetrically wound on to the
load.
WARNING! Slinging with one rope may
cause the load to turn during
hoisting, the rope to untwist,
or the rope to slip from its
original winding position on
the load, which can result in a
dangerous accident.
Limit the hanging angle to 60°, as a rule.
•
Do not sling a heavy load with ropes forming a
wide hanging angle from the hook. When hoisting a
load with two or more ropes, the force subjected to
each rope will increase with the hanging angles.
•
The following table shows the variation of
allowable load in kN (kg) when hoisting is made
with two ropes, each of which is allowed to sling up
to 9.8 kN (1,000 kg) vertically, at various hanging
angles.
•
When two ropes sling a load vertically, up to
19.6 kN (2,000 kg) of total weight can be
suspended. This weight is reduced to 9.8 kN
(1,000 kg) when two ropes make a 120° hanging
angle. On the other hand, two ropes are subject to
an excessive force as large as 39.2 kN (4,000 kg) if
they sling a 19.6 kN (2,000 kg) load at a lifting
angle of 150°.
When installing wire ropes to an angular load, apply
pads to protect the wire ropes. If the load is slippery,
apply proper material to prevent the wire rope from
slipping.
Use the specified eyebolts and fix wire ropes, chains,
etc. to them with shackles, etc.
00
00-7 ➁
Advertisement
