Genie Z-30/20N Service Manual

Also see for Z-30/20N: Maintenance manual Maintenance manual Service manual Service and repair manual Service manual

Contents

Genie Z-30/20N Service Manual Manual pdf 69 page image

Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N 4 - 19June 2011 Section 4 • Repair ProceduresREV A11 Swing the leveling link up out of the way andsecure it from moving.12 Tag, disconnect and plug the primary boom liftcylinder hydraulic hoses. Cap the fittings on thecylinder.Bodily injury hazard. Sprayinghydraulic oil can penetrate andburn skin. Loosen hydraulicconnections very slowly to allowthe oil pressure to dissipategradually. Do not allow oil to squirtor spray.13 Support the barrel end of the primary boom liftcylinder with straps or ropes to restrict it fromswinging freely.14 Remove the pin retaining fastener from theprimary boom lift cylinder barrel-end pivot pin.Do not remove the pivot pin.15 Place a rod through the barrel-end pivot pin andtwist to remove the pin.Crushing hazard. The primaryboom lift cylinder may fall whenthe barrel-end pivot pin is removedif not properly supported.16 Attach an overhead crane or similar liftingdevice to the lug on the rod-end of the primaryboom lift cylinder. Carefully loosen the strapsand allow the primary boom lift cylinder toslowly swing down.17 Carefully remove the cylinder from the machine.Crushing hazard. The primaryboom lift cylinder will fall if notproperly supported when it isremoved from the machine.PRIMARY BOOM COMPONENTS4-4Extension CylinderThe extension cylinder extends and retracts theprimary boom extension tube. The extensioncylinder is equipped with counterbalance valves toprevent movement in the event of a hydraulic linefailure.How to Remove theExtension 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. Dealerservice is strongly recommended.Note: When removing a hose assembly or fitting,the O-ring on the fitting and/or hose end must bereplaced and then torqued to specification duringinstallation. Refer to Section 2,Hydraulic Hose andFitting Torque Specifications.1 Raise the primary boom to the horizontalposition. Extend the boom 3 to 4 feet / 1 m untilthe extension cylinder rod-end pivot pins areaccessible.2 Remove the external snap rings from theextension cylinder rod-end pivot pins. Use asoft metal drift to remove the pins.3 Remove the counterweight cover fasteners.Remove the counterweight cover from themachine.4 Raise the secondary boom until the mastercylinder rod-end pivot pin is accessible.