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Foreword
Hoisting instructions
Hoisting
k
Heavy parts (25 kg or more) must be lifted
with a hoist, etc. In the Disassembly and
assembly section, every part weighing 25
kg or more is indicated clearly with the
4
symbol
•
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
1) Use adequate ropes depending on the
weight of parts to be hoisted, referring to the
table below:
(Standard "Z" or "S" twist ropes
without galvanizing)
Rope diameter
mm
10
11.5
12.5
14
16
18
20
22.4
30
40
50
60
a The allowable load value is estimated to be
one-sixth or one-seventh of the breaking
strength of the rope used.
2) Sling wire ropes from the middle portion of
the hook.
Wire ropes
Allowable load
kN
tons
9.8
1.0
13.7
1.4
15.7
1.6
21.6
2.2
27.5
2.8
35.3
3.6
43.1
4.4
54.9
5.6
98.1
10.0
176.5
18.0
274.6
28.0
392.2
40.0
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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 mid-
dle portion.
100%
88%
79%
3) Do not sling a heavy load with one rope
alone, but sling with two or more ropes
symmetrically wound onto the load.
k
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 dangerous
accident.
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
kN {kg} when hoisting is made with two
ropes, each of which is allowed to sling up
to 9.8 kN {1000 kg} vertically, at various
hanging angles.
When two ropes sling a load vertically, up to
19.6 kN {2000 kg} of total weight can be
suspended. This weight becomes 9.8 kN
{1000 kg} when two ropes make a 120?
hanging angle. On the other hand, two
ropes are subjected to an excessive force
as large as 39.2 kN {4000 kg} if they sling a
19.6 kN {2000 kg} load at a lifting angle of
150°.
Hoisting instructions
71%
41%
SAD00479
00-7
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