Genie TZ-50 Servise Manual

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Genie TZ-50 Servise Manual Manual pdf 77 page image

REV A4 - 28 Genie TZ-50/30 Part No. 84577November 2004Section 4 • Repair ProceduresHydraulic Pump7-1Function PumpThe hydraulic pumps are attached to the motorwhich makes up the hydraulic power unit.How to Test the Hydraulic PumpWhen removing a hose assemblyor fitting, the fitting and/or hoseend must be torqued tospecification during installation.Refer to Section 2, Hydraulic Hoseand Fitting Torque Specifications.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.