REV BSection 4 • Repair Procedures June 20054 - 18 TMZ-34/19 Part No. 520754-2Lift CylindersThe primary boom lift cylinder raises and lowersthe primary boom. The primary boom lift cylinder isequipped with a bi-directional solenoid valve toprevent movement in the event of a hydraulic linefailure.How to Remove the PrimaryBoom Lift CylinderWhen removing a hose assemblyor fitting, the O-ring on the fittingand/or hose end must be replacedand then torqued to specificationduring installation. Refer toSection 2, Hydraulic Hose andFitting Torque Specifications.Perform this procedure on a firm,level surface.1 Tag, disconnect and plug the hydraulic hoseson the primary boom lift cylinder. Cap thefittings on the cylinder.Bodily 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.2 Tag and disconnect the wiring from the solenoidvalve on the cylinder.3 Support the primary boom lift cylinder with anoverhead crane or similar lifting device.4 Remove the pin retaining fastener from theprimary boom lift cylinder barrel-end pivot pin.a primary boom lift cylinder barrel-end pivot pinb primary boom lift cylinderc primary boom lift cylinder rod-end pivot pind primary boome secondary booma b dc e5 Using a soft metal drift, remove the primaryboom lift cylinder barrel-end pivot pin.Crushing hazard. The lift cylinderwill fall if not properly supported.6 Lower the cylinder onto the secondary boom.Component damage hazard. Thesolenoid valve on the lift cylindercan be damaged if allowed tocome in contact with the boom.7 Remove the pin retaining fastener from theprimary boom lift cylinder rod-end pivot pin.8 Using a soft metal drift, remove the primaryboom lift cylinder rod-end pivot pin.Crushing hazard. The lift cylinderwill fall if not properly supported.9 Carefully remove the cylinder from the machine.Crushing hazard. The lift cylindercould become unbalanced and fallif not properly supported whenremoved from the machine.Component damage hazard. Thesolenoid valve can be damaged.Use caution when removing thecylinder from the machine.BOOM COMPONENTS800-610-4101ActionRental.com
