7 - 26 Genie Z-45/22 Part No. 32960Service Manual - Second EditionSection 7 - Repair ProceduresSECONDARY BOOM COMPONENTSBodily 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.3 Remove the pin retainers from each secondarylift cylinder rod-end pivot pin.4 Place a rod through the rod-end pivot pin andtwist to remove the pin.a pivot pinb 10 to 12 inch (30cm) rod5 Loosen, but do not remove, the counterbalancevalve to fully retract the cylinder.The counterbalance valve ispre-set from the factory. Do notadjust this valve.6 Remove the pin retainer from the pivot pins atthe barrel-ends of each secondary lift cylinder.7 Place a rod through each barrel-end pivot pinand twist to remove the pins. Remove thesecondary lift cylinders from the machine.Crushing hazard. The secondarylift cylinders will fall when thebarrel-end pivot pins are removedif they are not properly supported.Prior to removing the secondarylift cylinder, mark the location ofthe hydraulic fitting with a specialinternal orifice. Be sure to installthe fitting into the same locationduring re-assembly.ab4-2Secondary Boom Lift CylindersThere are two boom lift cylinders incorporated inthe structure of the secondary boom assembly.These cylinders operate in parallel and requirehydraulic pressure to extend and retract. Eachsecondary boom lift cylinder is equipped with acounterbalance valves to prevent movement in theevent of a hydraulic line failure. A 1200 psi (83bar) relief valve for the down function is located onthe boom function manifold.How to Remove the SecondaryLift CylindersThis procedure requires specificrepair skills, lifting equipment anda suitable workshop. Attemptingthis procedure without these skillsand tools may result in death orserious injury and significantcomponent damage. Dealerservice is strongly recommended.1 Lower the secondary boom to full rest, thenraise the primary boom just above the drivelimit switch.a drive limit switch2 Disconnect and plug the hydraulic hose andsteel lines for each secondary lift cylinder.a800-610-4101ActionRental.com
