4 - 20 S-60 • S-65 Part No. 77828July 2005Section 4 • Repair ProceduresREV B4-4Boom Extension CylinderThe primary boom extension cylinder is locatedinside the boom assembly and incorporates cablesand pulleys that are responsible for extending thenumber 3 boom tube. The primary boom extensioncylinder is equipped with counterbalance valves toprevent movement in the event of a hydraulic linefailure.How to Remove the BoomExtension CylinderBodily 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.When removing a hose assemblyor fitting, the O-ring on the fittingand/or hose end must be replacedand then torqued to specificationduring installation.Refer to Section 2,Hydraulic Hoseand Fitting Torque Specifications.Perform this procedure with theboom fully retracted.1 Raise the boom to a horizontal position.2 Remove the access covers from both sides ofthe boom at the pivot end.BOOM COMPONENTS3 Remove the boom end cover from the pivot endof the boom.4 Fully loosen the lock nuts on the extend cables.Do not remove the nuts.5 Loosen the retract cable nut at the platform endof the boom. Pull the cable rod from the supportand let it hang down.6 Remove the cable guard fasteners and removethe cable guard.a cable guardb retaining blockba
