September 2016 Service and Repair ManualBoom ComponentsPart No. 1268556 479 Use a soft metal drift to remove the pin.Crushing hazard. The extensioncylinder could becomeunbalanced and fall whenremoved from primary boomextension tube if not properlysupported.10 Attach a lifting strap from an overhead crane tothe extension cylinder.11 Working at the end of the extension boom tubeopposite the jib boom mount, support and slidethe extension cylinder out of the extensionboom tube.Crushing hazard. The extensioncylinder could becomeunbalanced and fall whenremoved from primary boomextension tube if not properlysupported.Note: During removal, the overhead crane strap willneed to be carefully adjusted for proper balancing.4-3Primary Boom Lift CylinderThe primary boom lift cylinder raises and lowers theprimary boom. The primary boom lift cylinder isequipped with a counterbalance valve to preventmovement in the event of a hydraulic line failure.How to Remove the PrimaryBoom Lift CylinderBodily injury hazard. Thisprocedure requires specific repairskills, lifting equipment and asuitable workshop. Attemptingthis procedure without these skillsand tools could result in death orserious injury and significantcomponent damage. Dealerservice is strongly recommended.Note: When removing a hose assembly or fitting,the O-ring (if equipped) on the fitting and/or hoseend must be replaced. All connections must betorqued to specification during installation. Refer toSpecifications, Hydraulic Hose and Fitting TorqueSpecifications.Note: Perform this procedure with the boom in thestowed position.1 Raise the primary boom to a horizontalposition.2 Raise the secondary boom until the primaryboom lift cylinder rod-end pivot pin is above thecounterweight.3 Attach a 5 ton / 5000 kg overhead crane to theplatform end of the primary boom. Support theboom. Do not apply any lifting pressure.4 Support both ends of the primary boom liftcylinder with a second overhead crane orsimilar lifting device.
