Document JNw3rw8Gpm0b0dBKqropo1gZB

HOISTING APPARATUS AND CONVEYORS addition, detailed weekly inspection of the entire crane is recommended Hooks should be tested by X-ray or simi lar means Under no circumstances should a hook be heated to reduce a permanent set, rather, the hook should be replaced A crane operator never should attempt to make repairs hunself but should report to his foreman any condition that might make the crane unsafe to operate Certain faults so detected may be so dangerous that the crane should be shut down at once and not operated until the faults are corrected Following is a list of unsafe conditions to be followed mainly by operators0 of over head traveling cranes (see next section). Bearings loose, worn Brakes shoe wear Bridge, alignment out of true (indicated by screeching or squealing wheels) Bumpers on bridge loose, missing, im proper placement Collector shoes or bars worn, pitted, loose, broken. Controllers faulty operation because of electrical or mechanical defects Couplings loose, wom Drum rough edges on cable grooves End stops on trolley loose, missing, im proper placement Footwalk condition Gears lack of lubrication or foreign ma terial in gear teeth (indicated by grinding or squealing). Guards bent, broken, lost Hoisbng cable broken strands Hook block chipped sheave wheels. Hooks straightening Lights (warning or signal) burned out, broken Limit stops functioning properly Lubrication overflowing on rails, dirty cups Mechanical parts (nvets, covers, etc ) loose Overload-relay, frequent tripping of power Rails (trolley or runway) broken, chipped, cracked Wheels worn (indicated by bumpy nding). Overhead traveling cranes An overhead traveling crane (Fig 18-7) may be operated either from a cage or from the floor. In the latter case, control devices may be either pendant pushbuttons or pul] Fig. 18-8. Operator controls 10-ton over head crane from shop floor Unit on his belt sends radio signals to a receiver in the crane cab, which in turn actuates con ventional magnetic controls of the crane. Courtesy Telemotive Division, Dyneseen Corp ropes The control handles should be clearly identified by signs and by shape or position so that the operator, without taking his eyes off the signalman, can tell by the "feel" which motion he is about to control. Like- 0 Adapted from a list furnished by Elec tric Controller and Manufacturing Company 18-11