Part No. 102916 S-100 • S-105 • S-120 • S-125 4 - 43June 2011 Section 4 • Repair ProceduresREV A4-3Boom Lift CylinderHow to Remove the BoomLift CylinderBodily injury hazard. Thisprocedure requires specific repairskills, lifting equipment and asuitable workshop. Attempting thisprocedure without these skills andtools could result in death orserious injury and significantcomponent damage. Dealerservice is strongly recommended.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 Hose and FittingTorque Specifications.1 Raise the boom until there is approximately4 feet / 1.2 m between the turntable and boomrest pad.2 Attach a lifting strap from an overhead crane orother suitable lifting device to the rod end of thethe boom lift cylinder.3 Attach an overhead 10 ton / 9071 kg crane tothe platform end of the boom for support. Do notlift the boom.4 Remove the boom storage area cover retainingfasteners. Remove the cover from the machine.5 Place support blocks under the boom liftcylinder.6 Remove the pin retaining fastener from theboom lift cylinder rod-end pivot pin. Use a softmetal drift to remove the pin. Protect thecylinder rod from damage.Crushing hazard. The boom liftcylinder may fall when the rod-endpivot pin is removed if the boom liftcylinder is not properly supportedby the overhead crane.Crushing hazard. The boom mayfall when the rod-end pivot pin isremoved if the boom is notproperly supported by theoverhead crane.7 Carefully raise the boom with the overheadcrane until the rod end of the boom lift cylindercan be removed.8 Carefully lower the rod end of the boom liftcylinder down onto the support blocks.9 Carefully raise the boom with the overheadcrane until the barrel end of the boom liftcylinder is accessible.10 Tag, disconnect and plug the boom lift 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.BOOM COMPONENTS
