FOREWORD
HOISTING INSTRUCTIONS
WB142-5
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HOISTING INSTRUCTIONS
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HOISTING
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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 interference
with the part to be removed.
WIRE ROPES
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1.
Use adequate ropes depending on the weight of parts to
be hoisted, referring to the table below:
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The allowable load value is estimated to be 1/6 or 1/7 of
the breaking strength of the rope used.
2.
Sling wire ropes from the middle portion of the hook.
Slinging near the edge of the hook may cause the rope to
slip off the hook during hoisting, and a serious accident
can result. Hooks have maximum strength at the middle
portion.
3.
Do not sling a heavy load with one rope alone, but sling
with two or more ropes symmetrically wound on to the
load.
4.
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 table below
shows the variation of allowable load when hoisting
with two ropes, each of which is allowed to sling up to
1000 kg (2205 lb) vertically, at various hanging angles.
When two ropes sling a load vertically, up to 2000 kg
(4409 lb) of total weight can be suspended. This weight
becomes 1000 kg when two ropes make a 120° hanging
angle. On the other hand, two ropes are subject to an
excessive force as large as 4000 kg (8818 lb) if they
sling a 2000 kg (4409 lb) load at a lifting angle of 150°.
WARNING!
Heavy parts (25 kg (55 lb) or
more) must be lifted with a
hoist, crane, etc. Every part
weighing 25 kg (55 lb) or
more is indicated clearly with
this symbol.
Wire ropes
(Standard “Z” or “S” twist ropes without galvanizing)
Rope diameter
Allowable load
mm (in)
kN
tons
10 (0.39)
9.8
1.0
11.2 (0.44)
13.7
1.4
12.5 (0.49)
15.7
1.6
14 (0.55)
21.6
2.2
16 (0.63)
27.5
2.8
18 (0.71)
35.3
3.6
20 (0.79)
43.1
4.4
22.4 (0.88)
54.9
5.6
30 (1.18)
98.1
10.0
40 (1.57)
176.5
18.0
50 (1.97)
274.6
28.0
60 (2.36)
392.2
40.0
WARNING!
Slinging with one rope may
cause turning of the load during
hoisting, untwisting of the rope,
or slipping of the rope from its
original winding position on the
load, which can result in a dan-
gerous accident.
