Genie GRC-12 Service Manual

Also see for Lift Guard GRC-12: Operator's manual supplement Operator's manual

Contents

Genie GRC-12 Service Manual Manual pdf 58 page image

Section 4 • Repair ProceduresREV ASeptember 20164 - 12 GRC Part No. 227123Hydraulic Pump3-1Function PumpThe hydraulic pump is attached to the motor whichmakes up the hydraulic power unit.How to Test the Hydraulic PumpNote: When removing a hose assembly or fitting,the fitting and/or hose end must be torqued tospecification during installation. Refer to Section 2,Hydraulic Hose and 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.There is no relief valve in thehydraulic pump and the pump canbe damaged if the pressure isallowed to exceed3200 psi / 221 bar. When testingthe pump, activate the pump inone second intervals until3200 psi / 221 bar is confirmed.Do not over-pressurize the 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.