while the boom is under load (fig. 12-15, view A). TheTo check the accuracy of the boom angleboom angle on lattice boom cranes is the angle betweenindicator, place a 3-foot builders level on thethe center line of the boom (from the boom butt pins tocenter boom section and raise or lower the boomthe boom tip sheave) and the horizontal while the boomuntil the level indicates the boom is levelis under load (fig. 12-15, view B).(fig. 12-16). At this point the boom angle indicatorFigure 12-15.—Boom angle configurations.Figure 12-16.-Check accuracy of boom angle indicator.12-8
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business