September 2016 Service and Repair ManualHydraulic PumpsPart No. 1268548 Z-45/25 • Z-45/25J 617-2Drive PumpThe drive pump is a bi-directional variabledisplacement piston pump. The pump output iscontrolled by the electro-proportional controller,located on the pump. The only adjustment that canbe made to the pump is the neutral or nulladjustment. Any internal service to the pumpshould only be performed at an authorized EatonHydraulics center. Call Genie Service Departmentto locate your local authorized service center.How to Remove the Drive PumpComponent damage hazard. Thework area and surfaces wherethis procedure will be performedmust be clean and free of debristhat could get into the hydraulicsystem and cause severecomponent damage. Dealerservice is recommended.Note: 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 Disconnect the electrical connectors at theelectrical proportional controller located on thedrive pump.2 Locate the two hydraulic tank valves at thehydraulic tank through the access holeunderneath the turntable. Close the valves.Component damage hazard.The engine must not be startedwith the hydraulic tank shut-offvalves in the closed position orcomponent damage will occur. Ifthe tank valves are closed,remove the key from the keyswitch and tag the machine toinform personnel of thecondition.open closed3 Tag and disconnect and plug the hydraulichoses from the drive and lift/steer pumps. Capthe fittings on the pumps.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.4 Support the pump with a lifting device andremove the two drive pump mountingfasteners.
