REV BSection 4 • Repair ProceduresJune 2005Part No. 52075 TMZ-34/19 4 - 376-3Hydraulic PumpHow toTest the Hydraulic PumpWhen removing a hose assemblyor fitting, the O-ring on the fittingand/or hose end must be replacedand then torqued to specificationduring installation. Refer toSection 2, Hydraulic Hose andFitting Torque Specifications.Perform this procedure with themanual override knob turned fullycounterclockwise to the closedposition.1 Tag, disconnect and plug the hydraulic hosefrom the high pressure port at the top of themain function 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 a function enable button and any liftfunction button at the ground controls.Result: If the pressure gauge reads3000 psi / 207 bar, immediately stop. The pumpis good.Component damage hazard. If thepressure exceeds3000 psi / 207 bar, see 6-2, Howto Adjust the System Relief Valve.Result: If pressure fails to reach3000 psi / 207 bar, the internal relief valvesetting is incorrect OR the proportional valve isfaulty OR the pump is faulty and will need to beserviced or replaced.5 Remove the pressure gauge and reconnect thehydraulic hose.HYDRAULIC POWER UNIT800-610-4101ActionRental.com
