Komatsu PC200LC-8 Shop Manual page 7

FOREWORD
12
HOISTING INSTRUCTIONS
Hoisting
WARNING! 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 sym-
bol.
●
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.
Wire Ropes
1. Use adequate ropes depending on the weight of parts to
be hoisted, referring to the table below:
Wire ropes
(Standard "Z" or "S" twist ropes without galvanizing)
Rope diameter
mm
10
11.2
12.5
14
16
18
20
22.4
30
40
50
60
★ 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
PC200LC-8
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3.
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4.
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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HOISTING INSTRUCTIONS
can result. Hooks have maximum strength at the middle
portion.
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 turning of the load dur-
ing hoisting, untwisting of the
rope, or slipping of the rope
from its original winding posi-
tion on the load, which can
result in a dangerous accident
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 (kg) when hoist-
ing is made with two ropes, each of which is allowed to
sling up to 1000 kg vertically, at various hanging angles.
When two ropes sling a load vertically, up to 2000 kg 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 if they sling a 2000 kg load at a
lifting angle of 150°.
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