Service and Repair Manual September 2016Primary Boom Components32 Z®-45/25 Bi-Energy • Z®-45/25J Bi-Energy Part No. 1268546GT4-5Platform Leveling MasterCylinderThe master cylinder acts as a pump for the slavecylinder. It’s part of the closed circuit hydraulic loopthat keeps the platform level through the entirerange of boom motion. The master cylinder islocated at the base of the primary boom.How to Remove the PlatformLeveling Master CylinderNote: 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.1 Raise the secondary boom until both therod-end and barrel-end pivot pins on themaster cylinder are accessible.2 Tag, disconnect and plug the master cylinderhydraulic 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 tosquirt or spray.3 Attach overhead crane or similar lifting deviceto the master cylinder.4 Remove the pin retaining fasteners from themaster cylinder barrel-end pivot pin.5 Place a rod through the barrel-end pivot pinand twist to remove the pin.6 Remove the pin retaining fastener from therod-end pivot pin.7 Place a rod through the rod-end pivot pin andtwist to remove the pin.8 Remove the master cylinder from themachine.Crushing hazard. The mastercylinder could becomeunbalanced and fall if notproperly attached to theoverhead crane.
