FOREWORD HOISTING INSTRUCTIONS HOISTING INSTRUCTIONS Slinging near the edge of the hook may cause the rope to slip off the hook during hoisting, and a seri- ous accident can result. Hooks have a maximum strength at the middle portion. HOISTING Heavy parts (25 kg or more) must be lifted with a hoist, etc. In the DISASSEM- BLY AND ASSEMBLY section, every part weighing 25 kg op mroe is indicated with the symbol If a part cannot be smootlhy 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 caus- ing interference with the part to be re- moved.
3) Do not sling a heavy load with one rope alone, but sling with two or more ropes symmetrically wound onto 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 result in a dangerous accident. WIRE ROPES 1) Use adequate ropes depending on the weight of parts to be hoisted, referring to the table below: 4) Do not sling a heavy load with ropes forming a wide hanging angle from the hook. When hoist- ing a load with two or more ropes, the force sub- jected to each rope will increase with the nahging 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 hang- ing 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 excessive force as large as 4000 kg if they sling a 2000 kg load at a lifting angle of 150°. s e p o r e ri W s e p o r tsi w t " S " r o " Z " d r a d n a t S ( g nizin a vla g t u o h ti w # 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. 00-7 Ropediameter(mm) Allowableload(tons) 10 11.2 12.5 14 16 18 20 22.4 30 40 50 60 1.0 1.4 1.6 2.2 2..8 3.6 4.4 5.6 10.0 18.0 28.0 40.0