Genie TZ-50 Service Manual

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Contents

Genie TZ-50 Service Manual Manual pdf 84 page image

4 - 28 Genie TZ-50 Part No. 824982September 2014Section 4 • Repair Procedures7-1Function PumpThe hydraulic pumps are attached to the motorwhich makes up the hydraulic power unit.How to Test the Hydraulic PumpNote: 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. Referto Section 2,Hydraulic Hose and Fitting TorqueSpecifications.1 Tag, disconnect and plug the high pressurehydraulic hose from the hydraulic pump.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.2 Connect a 0 to 5000 psi / 0 to 350 bar pressuregauge to the high pressure port on the pump.3 Turn the key switch to ground control and pullout the red Emergency Stop button to the onposition at both the ground and platformcontrols.4 Activate the platform up function from theground controls.Result: If the pressure gauge reads3200 psi / 221 bar, immediately stop. The pumpis good.Result: If pressure fails to reach3200 psi / 221 bar, the pump is bad and willneed to be serviced or replaced.Component damage hazard. Thereis no relief valve in the hydraulicpump and the pump can bedamaged if the pressure is allowedto exceed 3200 psi / 221 bar.When testing the pump, activatethe pump in one second intervalsuntil 3200 psi / 221 bar isconfirmed. Do not over-pressurizethe pump.5 Remove the pressure gauge and reconnect thehydraulic hose. Torque to specification.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.Hydraulic Pump