4 - 30 Genie Z-60/34 Part No. 75861November 2003Section 4 • Repair ProceduresREV ASECONDARY BOOM COMPONENTS49 Attach a 5 ton / 5,000 kg overhead crane to themid-pivot.50 Remove the pin retaining fasteners from thelower secondary boom pivot pin at themid-pivot. Use a soft metal drift to remove thepin, then remove the mid-pivot from themachine.Crushing hazard. The mid-pivotcould become unbalanced and fallwhen removed from the machine ifnot properly supported by theoverhead crane.51 Remove the hose and cable covers from thelower secondary boom.52 Attach a 5 ton / 5,000 kg overhead crane to thecenter point of the lower secondary boom.53 Remove the pin retaining fasteners from thelower secondary boom pivot pin at the turntablepivot. Use a soft metal drift to remove the pin,then remove the lower secondary boom fromthe machine.Crushing hazard. The lowersecondary boom could becomeunbalanced and fall whenremoved from the machine if notproperly supported by theoverhead crane.5-2Secondary Boom Lift CylinderThe secondary boom lift cylinder raises andlowers the secondary boom. The secondaryboom lift cylinder is equipped with counterbalancevalves to prevent movement in the event of ahydraulic line failure.How to Remove theSecondary Boom Lift CylinderBodily injury hazard. Thisprocedure requires specific repairskills, lifting equipment and asuitable workshop. Attempting thisprocedure without these skills andtools could result in death orserious injury and significantcomponent damage.When removing a hose assemblyor fitting, the O-ring on the fittingand/or hose end must be replacedand then torqued to specificationduring installation.Refer to Section Two, HydraulicHose and Fitting TorqueSpecifications.1 Attach a lifting strap from an overhead crane tothe lug on the rod end of the secondary boomlift cylinder.
