Komatsu Utility SK714-5, Shop Manual

Page: 11 / 258

SK714-5 SK815-5 SK815-5 turbo
HOISTING INSTRUCTIONS
1. If a part cannot be smoothly removed from the ma-
chine by hoisting, the following checks should be
made:
• Check for removal of all bolts fastening the part
to the relative parts.
• Check for any part causing interference with
the part to be removed.
2. Wire ropes
1) Use adequate ropes depending on the weight of
parts to be hoisted, referring to the table below:
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.
Slinging near the edge of the hook may cause the
rope to slip off the hook during hoist
in g, and a se-
rious accident can result.
Hooks have maximum strength at the middle por-
tion.
3) Do not sling a heavy load with one rope alone, but
sling with two or more ropes symmetrically wound
on to the load.
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 cause dangerous accidents.
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 (kg) when hoisting is made with two ropes,
each of which is allowed to sling up to 1000 kg ver-
tically, at various handing 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 subjected to an ex-
cessive force as large as 4000 kg if they sling a 2000
kg load at a lifting angle of 150°.
Heavy parts (25 kg or more) must be lifted
with a hoist etc. In the Disassembly and Assem-
bly section, every part weighing 25 kg or more is
clearly indicated with the symbol
WIRE ROPES
(Standard «S» or «Z» twist ropes
without galvanizing)
Rope diameter (mm) Allowable load (tons)
10.0
11.2
12.5
14.0
16.0
18.0
20.0
22.4
30.0
40.0
50.0
60.0
1.0
1.4
1.6
2.2
2.8
3.6
4.4
5.6
10.0
18.0
28.0
40.0
HOISTING INSTRUCTIONS
00-7