Part No. 102521 S-40 • S-45 4 - 9October 2013 Section 4 • Repair ProceduresPLATFORM COMPONENTS2-2Platform RotatorThe platform rotator is a hydraulically activatedhelical gear assembly used to rotate the platform160 degrees.How to Remove thePlatform RotatorComponent damage hazard. Markthe platform mounting weldmentand the rotator flange beforeremoving the platform mountingweldment. The platform mountingweldment must be replaced in theexact same position on the rotatorflange as it was before removal. Ifa 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 on the fitting and/or hose end must bereplaced and then torqued to specification duringinstallation. Refer to Section Two,Hydraulic Hoseand Fitting Torque Specifications.1 Remove the platform and platform support.S-40 Models:2 Tag, disconnect and plug the hydraulic hosesfrom the platform rotator. Cap the fittings on therotator.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.S-45 Models:3 Tag and disconnect the hydraulic hoses fromthe "V1" and "V2" ports on the counterbalancevalve manifold located on the platform rotatorand connect them together using a connector.Cap the fittings on the manifold.4 Support the platform leveling arms and platformmounting weldment with an appropriate liftingdevice, but do not apply any lifting pressure.All Models:5 Remove the six mounting bolts from theplatform mounting weldment. Remove thecenter bolt and slide the platform mountingweldment off of the platform rotator.Crushing hazard. The platformmounting weldment could becomeunbalanced and fall if it is notproperly supported.6 Support the platform rotator with an appropriatelifting device. Do not apply any lifting pressure.Property of American Airlines
