Terex Genie GR-26J Service Manual

Also see for Genie GR-20J: Service manual Operator's manual

Section 4 • Repair ProceduresPart No. 227656GT GR™-20J • GR™-26J 4 - 11March 2022Illustration 2a mast head coverb mast head cover fastenersc mast headd jib boome proximity sensorf lift cylinderg mast head fastenersh lift cylinder fasteners4-1Mast AssemblyHow to Remove the MastAssemblyBodily 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 2,Hydraulic Hose andFitting Torque Specifications.Note: Perform this procedure with the machine ona firm, level surface that is free of obstructions, andthe machine in stowed position.1 Check the condition of the wear pads. Refer toMaintenance Procedure B-16,Inspect the MastWear Pads.2 Using Illustration 1 as a guide, create a safetysteel plate using the dimensions specified.3 Turn the key switch to off position and push inthe red Emergency Stop button to the offposition at both the ground and platformcontrols.4 Open and remove the turntable covers.5 Remove the fasteners securing the mast headcover to the mast. Set the fasteners to the side.6 Remove the mast head cover from the masthead.7 Tag and disconnect the proximity sensor. Laythe proximity sensor to the side.8 Tag, disconnect and plug the hydraulic hose atthe top of the lift cylinder. Remove the hoseconnector from the lift cylinder. Plug the liftcylinder.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.Mast ComponentsIllustration 1a safety steel platea300 mm10 mm130 mm50 mm25 mm85 mm2 x Ø18 mmacedgfbh