TM 5-3810-306-10CAUTIONUnless lifting within On Rubbercapacities, outrigger beams must befully extended with jack cylindersextended to provide maximum levelingof crane. Remove all weight from tiresbefore lifting on outriggers.8.Use sight level bubble indicator to ensure crane islevel.NOTEYou can also use the load line todetermine the levelness of the crane. Itshould always lie in the center of theboom. Check at two points 90 degreesapart.WARNINGThe importance of properly leveling acrane cannot beoverstressed. A craneonly slightly out-of-level can quicklyencounter a tipping condition.9.After crane has been set-up, make a dry run beforemaking the first lift. Become familiar with all factorspeculiar to job site. Know what moves to makeBEFORE attaching first load.USING YOUR LOAD CHART (REFER TO APPENDIXF.)NOTEOne of the most important tools of everycrane is the load chart found in thecrane operator’s cab. It containsinformation which must be thoroughlyunderstood.The load chart contains a 360 degree on- outriggerscapacity chart and an on-rubber capacity chart.The capacity charts are divided into capacities limited bystructural strength and capacities limited by stability. Thisis shown by the bold lines across the chart. Capacitiesabove the line are limited by structural strength andcapacities below the line are limited by crane stability.The chart shows the radius of the load in a column at theleft. The radius is the distance between the centerline ofrotation of the crane and the center of gravity of the load.Various boom lengths are listed across the top, rangingfrom fully retracted to fully extended. The boom angle (indegrees) required for the given lift is shown inparentheses below the maximum total weight which canbe lifted. Note that the boom lengths in between theincrements shown should always be treated as if theboom was extended to the next longer length. Forexample, if the load chart has capacities for 50-foot and55-foot boom lengths and the actual length of the boomin use is 52 feet, then the maximum capacity will belisted under the 55 foot boom length because the boomis beyond 50 feet in length.Another important section of the load chart is the rangediagram. The range diagram shows the tip height at eachboom length, angle and radius. If the you know theradius required for a specific lift and the tip height youcan calculate the required boom length and angleneeded for the lift. Check the capacity chart for thespecific boom length and radius to find out if the crane iscapable of performing the lift safely. If the boom lengthand angle are known, the radius can be determined fromthe range diagram.2-41
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