Section 4 • Repair Procedures4 - 62 S-80 • S-85 • S-80X Part No. 122985February 2012FUEL AND HYDRAULIC TANKS9-2Hydraulic TankThe primary functions of the hydraulic tank are tocool, clean and de-aerate the hydraulic fluid duringoperation. The tank utilizes internal suctionstrainers for the pump supply hoses and has anexternal return filter equipped with a filter conditionindicator.How to Remove theHydraulic TankComponent damage hazard.The work area and surfaceswhere this procedure will beperformed must be clean andfree of debris that could getinto the hydraulic system.Note: When removing a hose assembly or fitting,the O-ring (if equipped) on the fitting and/or thehose end must be replaced. All connections mustbe torqued to specification during installation.Refer to Section 2,Hydraulic Hose and FittingTorque Specifications.1 Remove the fuel tank. See 9-1,How to Removethe Fuel Tank.2 Close the two hydraulic tank valves located atthe hydraulic tank (if equipped).Component damage hazard. Theengine must not be started withthe hydraulic tank shutoff valves inthe CLOSED position or componentdamage will occur. If the tankvalves are closed, remove the keyfrom the key switch and tag themachine to inform personnel of thecondition.3 Remove the drain plug from the hydraulic tankand completely drain the tank into a suitablecontainer. Refer to Section 2,Specifications.4 Tag, disconnect and plug the two suction hosesthat are attached to the hydraulic tank.5 Tag and disconnect and plug the hose from thereturn filter. Cap the fitting on the return filterhousing.6 Tag and disconnect and plug the supply hosefor the auxiliary power unit. Cap the fitting onthe hydraulic tank.open closed
