Genie Z-30/20N Service Manual
Also see for Z-30/20N: Maintenance manualMaintenance manualService manualService and repair manualService manual
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Contents
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4 - 4 Genie Z-30/20N Part No. 106373April 2005Section 4 • Repair ProceduresREV B2-1Platform Leveling Slave CylinderThe slave cylinder and the rotator pivot are thetwo primary supports for the platform. The slavecylinder keeps the platform level through theentire range of primary boom motion. It operates ina closed loop hydraulic circuit with the mastercylinder. The slave cylinder is equipped withcounterbalance valves to prevent platformmovement in the event of a hydraulic line failure.How to Remove the SlaveCylinderBefore cylinder removal isconsidered, bleed the slavecylinder to be sure there is noair in the closed loop hydrauliccircuit.When removing a hose assemblyor fitting, the O-ring on the fittingand/or hose end must be replacedand then torqued to specificationduring installation. Refer toSection 2,Hydraulic Hose andFitting Torque Specifications.1 Extend the boom until the slave cylinderbarrel-end pivot pin is accessible.2 Raise the boom slightly and place blocks underthe platform for support. Lower the boom untilthe platform is resting on the blocks.3 Tag and disconnect the hydraulic hoses to theslave cylinder at the union and connect themtogether with a connector. Cap the fittings onthe cylinder hoses.Bodily injury hazard. Sprayinghydraulic oil can penetrate andburn skin. Loosen hydraulicconnections very slowly to allowthe oil pressure to dissipategradually. Do not allow oil tosquirt or spray.4 Remove the external snap rings from therod-end pivot pin. Do not remove the pin.5 Remove the external snap rings from thebarrel-end pivot pin.6 Place a block of wood under the barrel of theslave cylinder for support.7 Use a soft metal drift to remove the rod-endpivot pin.Crushing hazard. The platformcould fall if not properly supported.8 Use a soft metal drift to remove the barrel-endpivot pin.9 Carefully pull the cylinder with hydraulic hosesout of the boom.Crushing hazard. The slavecylinder could fall if not properlysupported.How to Bleed the Slave Cylinder1 Raise the jib boom to a horizontal position.2 Move the platform level toggle switch up anddown through two platform leveling cycles toremove any air that might be in the system.Platform Components |
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