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 68 page image

4 - 18 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N Part No. 139378June 2011Section 4 • Repair ProceduresREV APRIMARY BOOM COMPONENTS4-3Primary Boom Lift CylinderThe primary boom lift cylinder raises and lowersthe primary boom. The primary boom lift cylinder isequipped with counterbalance valves 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. 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 secondary boom enough to accessthe primary boom lift cylinder barrel-endpivot pin.2 Raise the primary boom enough to access theprimary boom lift cylinder rod-end pivot pin.3 Support the primary boom lift cylinder with asuitable lifting device. Place a block of woodacross the upper secondary boom to supportthe cylinder when the rod-end pin is removed.4 Attach an overhead crane to the primary boomat the platform end for support. Raise theprimary boom using the overhead crane justenough to relieve the pressure on the primaryboom lift cylinder rod-end pivot pin.5 Remove the counterweight cover fasteners.Remove the counterweight cover from themachine.6 Place a block of wood between thecounterweight plate on the leveling link and thecross member of the upper secondary boom.Carefully lower the secondary boom onto theblock.Crushing hazard. Keep handsaway from the block and allmoving parts when lowering thesecondary boom onto the block.7 Remove the pin retaining fasteners from theprimary boom lift cylinder rod-end pivot pin. Usea soft metal drift to remove the pin.Crushing hazard. The primaryboom lift cylinder may fall if notproperly supported when therod-end pivot pin is removed.8 Lower the rod end of the cylinder onto theblocks that were placed on the uppersecondary boom.9 Remove the pin retaining fastener from theground control side upper secondary levelinglink pivot pin at the upper pivot (same side ofmachine as the primary boom lift cylinderbarrel-end pivot pin retainer).10 Place a rod through the upper secondaryleveling link pivot pin at the upper pivot andtwist to remove the pin.