FOREWORD
HOISTING INSTRUCTIONS
WA500-3H
00-11
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 (kg) when hoisting 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°
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
