Service Manual April 2016Primary Boom Components74 Z-34/22 Bi-Energy Part No. 1392344-4Primary Boom ExtensionCylinderThe primary boom extension cylinder extends andretracts the primary boom extension tube. Theprimary boom extension cylinder is equipped withcounterbalance valves to prevent movement in theevent of a hydraulic line failure.How to R emove the Primary Boom Ex tensi on CylinderHow to Remove the PrimaryBoom Extension 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.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 Raise the primary boom to a horizontalposition. Then extend the boom approximately3 to 4 feet / 1 m until the extension cylinderrod-end pivot pins are accessible.2 Remove the external snap rings from theextension cylinder rod-end pivot pins. Use asoft metal drift to remove the pins.3 Remove the rear turntable cover.4 Raise the secondary boom until the mastercylinder rod-end pivot pin is accessible.5 Remove the drive speed limit switch from thepivot end of the primary boom. Do notdisconnect the wiring.6 Remove the pin retaining fasteners from themaster cylinder rod end pivot pin. Use a softmetal drift to remove the pin.7 Manually retract the master cylinder and pushit toward the platform end of the boom toobtain enough clearance for the extensioncylinder removal.8 Tag, disconnect and plug the extensioncylinder 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.9 Remove the pin retaining fasteners from theextension cylinder pivot pin. Use a soft metaldrift to remove the pin.
