April 2018 Service and Repair ManualPlatform ComponentsPart No. 1279835GT ZX®-135/70 312-3Platform RotatorThe platform rotator is a hydraulically activatedhelical gear assembly used to rotate the platform160 degrees.How to Remove the PlatformRotatorComponent damage hazard.Mark the platform mountingweldment and the rotator flangebefore removing the platformmounting weldment. Theplatform mounting weldmentmust be replaced in the exactsame position on the rotatorflange as it was before removal.If a new rotator is installed or therotator is disassembled, properalignment can be achieved byrotating the rotator all the way tothe left and then installing theplatform mounting weldment allthe way in the left position.Note: 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 Remove the platform. Refer to RepairProcedure, How to Remove the Platform.2 Tag and disconnect the electrical connectorfrom the platform angle sensor.3 Remove the platform angle sensor retainingfasteners. Remove the platform angle sensorfrom the platform rotator.Component damage hazard. Theplatform angle sensor is a verysensitive instrument. It can bedamaged internally if is droppedor sustains any physical shock,even if the damage is not visible.4 Tag, disconnect and plug the hydraulic hosesfrom the platform rotator manifold. Cap thefittings on the manifold.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.5 Tag, disconnect and plug the hydraulic hosesfrom the platform manifold. Cap the fittings onthe manifold.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.6 Remove the power to platform electrical outletbox bracket mounting fasteners. Do notdisconnect the wiring.
