FOREWORD HOISTING INSTRUCTIONS 12 HOISTING INSTRUCTIONS 00 HOISTING 00 . 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 indi- cated clearly with the symbol G 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 00 3. 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 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 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) 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 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° # 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. PC300LL-6 00-7 Rope diameter Allowable load mm kN tons 10 9.8 1.0 11.2 13.7 1.4 12.5 15.7 1.6 14 21.6 2.2 16 27.5 2.8 18 35.3 3.6 20 43.1 4.4 22.4 54.9 5.6 30 98.1 10.0 40 176.5 18.0 50 274.6 28.0 60 392.2 40.0