00 Index and foreword SEN00056-01 q If the load is unstable or the wire rope or chains are twisted, lower the load and lift it up again. 13) If the hoist stops because of a power fail- ure, turn the power switch OFF. When turning on a switch which was turned OFF by the electric shock prevention earth leakage breaker, check that the devices related to that switch are not in operation state. 14) If you find an obstacle around the hoist, stop the operation. 15) After finishing the work, stop the hoist at the specified position and raise the hook to at least 2 m above the floor. Do not leave the sling installed to the hook. q Do not lift up the load slantingly.
13) When lifting down a load, observe the fol- lowing. q When lifting down a load, stop it tem- porarily at 30 cm above the floor, and then lower it slowly. q Check that the load is stable, and then remove the sling. q Remove kinks and dirt from the wire ropes and chains used for the sling work, and put them in the specified place. 7. Selecting wire ropes 1) Select adequate ropes depending on the weight of parts to be hoisted, referring to the table below. 5. Precautions for using mobile crane a Read the Operation and Maintenance Manual of the crane carefully in advance and operate the crane safely. Wire ropes (Standard “Z” twist ropes without galvanizing) (JIS G3525, No. 6, Type 6X37-A) 6.
Precautions for using overhead hoist crane k When raising a heavy part (heavier than 25 kg), use a hoist, etc. In Disas- sembly and assembly, the weight of a part heavier than 25 kg is indicated after the mark of 4 . 1) Before starting work, inspect the wire ropes, brake, clutch, controller, rails, over wind stop device, electric shock preven- tion earth leakage breaker, crane collision prevention device, and power application warning lamp, and check safety. 2) Observe the signs for sling work. 3) Operate the hoist at a safe place. 4) Check the direction indicator plates (east, west, south, and north) and the directions of the control buttons without fail. 5) Do not sling a load slantingly.
Do not move the crane while the slung load is swinging. 6) Do not raise or lower a load while the crane is moving longitudinally or laterally. 7) Do not drag a sling. 8) When lifting up a load, stop it just after it leaves the ground and check safety, and then lift it up. 9) Consider the travel route in advance and lift up a load to a safe height. 10) Place the control switch on a position where it will not be an obstacle to work and passage. 11) After operating the hoist, do not swing the control switch. 12) Remember the position of the main switch so that you can turn off the power immedi- ately in an emergency.
a The allowable load is one-sixth of the breaking strength of the rope used (Safety coefficient: 6). D65EX, PX, WX-15E0 5 Nominal diameter of rope Allowable load mm kN ton 10 8.8 0.9 12 12.7 1.3 14 17.3 1.7 16 22.6 2.3 18 28.6 2.9 20 35.3 3.6 25 55.3 5.6 30 79.6 8.1 40 141.6 14.4 50 221.6 22.6 60 318.3 32.4