Service and Repair Manual July 2019Primary Boom Components48 S-40 XC • S-45 XC • S-40 TraX • S-45 TraX Part No. 1286829GT4-3Primary Boom Lift CylinderThe primary boom lift cylinder raises and lowersthe primary boom. The primary boom lift cylinder isequipped with a counterbalance valve to preventmovement in the event of a hydraulic line failure.How to Remove the PrimaryBoom Lift CylinderBodily injury hazard. Thisprocedure requires specific repairskills, lifting equipment and asuitable workshop. Attemptingthis procedure without these skillsand tools could result in death orserious injury and significantcomponent damage. Dealerservice is strongly recommended.1 Raise the primary boom to a horizontalposition.2 Place support blocks across the turntableunder the boom lift cylinder3 Attach a 5 ton / 5000 kg overhead crane to theprimary boom for support.4 Raise the primary boom with the overheadcrane slightly to take the pressure off theprimary boom lift cylinder pivot pins.5 Support the rod end and the barrel end of theprimary boom lift cylinder with a secondoverhead crane or similar lifting device.6 Tag, disconnect and plug the primary boom liftcylinder hydraulic hoses. Cap the fittings onthe cylinder.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.7 Remove the retaining fasteners from theprimary boom lift cylinder rod-end pivot pin.Use a soft metal drift to remove the pin. Lowerthe lift cylinder onto the blocks. Protect thecylinder rod from damage.Crushing hazard. The primaryboom will fall if not properlysupported when the primaryboom rod-end pivot pin isremoved.8 Remove the four mounting fasteners from thelift cylinder barrel-end pivot pin mountingplate.Crushing hazard. The primaryboom lift cylinder could becomeunbalanced and fall if notproperly supported by the liftingdevice.9 With the lift cylinder being supported by theoverhead crane, carefully pull the lift cylindertoward the platform to remove it from themachine.Crushing hazard. The lift cylindercould become unbalanced andfall if not properly supported andsecured to the lifting device.