April 2017 Service and Repair ManualBoom ComponentsPart No. 1272854 GTH-844 291-4Boom Extension CylinderHow to Remove the ExtensionCylinderNote: 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 boom to a horizontal position.2 Tag, disconnect and plug the hydraulic hosesat the boom extension cylinder manifold. Capthe fittings.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.Component damage hazard.Hoses can be damaged if theyare kinked or pinched.3 Remove the access covers on the number1 boom and remove the bolts holding theextend cylinder support at the fork end of themachine.4 At the pivot end of the machine, remove theretainer plates securing the extension cylinderto the number 2 and number 3 tubes and liftthe extension cylinder out of the supportsockets.5 Support the extension cylinder with a suitablelifting device and remove from the boomassembly.Note: During removal, the overhead crane strap willneed to be adjusted for proper balancing.1-5Fork Level CylinderHow to Remove the Fork LevelCylinderNote: 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 Remove the lifting fork frame. Refer to RepairProcedure, How to Remove the Lifting ForkFrame.2 Remove the fastener securing the fork levelcylinder rod-end pivot pin to the fork framemount.3 Use a soft metal drift to remove the pivot pin.4 Attach a lifting strap from an overhead crane tothe barrel end of the fork level cylinder.Support the cylinder. Do not apply any liftingpressure.
