September 2018 Service and Repair ManualTurntable Rotation ComponentsPart No. 1288652GT S® -60 XC ™ • S® -65 XC ™ 935 Remove the backlash pivot plate mountingbolts. Carefully remove the drive hub assemblyfrom the machine.Crushing hazard. The turntablecould rotate unexpectedly whenthe rotation drive hub assemblyis removed if the turntable is notsecured with the turntablerotation lock pin.Crushing hazard. The turntablerotation assembly could becomeunbalanced and fall whenremoved from the machine if notproperly supported by theoverhead crane.When installing the drive hub assembly:6 Install the drive hub. Torque the back lashpivot plate to specification. Refer toSpecifications, Machine TorqueSpecifications.7 Adjust turntable rotation gear backlash. Referto Repair Procedure, How to Adjust theTurntable Rotation Gear Backlash.How to Adj ust the Tur ntabl e R otati on Gear Bac klas hHow to Adjust the TurntableRotation Gear BacklashThe turntable rotation drive hub is mounted on anadjustable plate that controls the gap between therotation motor pinion gear and the turntable bearingring gear.Note: Perform this procedure with the boombetween the non-steer end tires and with themachine on a firm and level surface.1 Secure the turntable from rotating with theturntable rotation lock pin.Note: The turntable rotation lock pin is located nextto the boom rest pad.2 Loosen the backlash pivot plate mountingfasteners.1 backlash pivot plate2 adjustment bolt with lock nut3 backlash pivot plate mounting bolts
