REV BJune 2005Section 4 • Repair Procedures4 - 40 TMZ-50/30 Part No. 651628-1Function PumpThe TMZ-50/30 is equipped with one, two or fourhydraulic pumps, depending on how the machineis configured.Engine models: The hydraulic pump(s) areattached to the engine. Engine models with Driveoption are equipped with two pumps; Enginemodels without Drive are equipped with one.DC models: The hydraulic pump(s) are attachedto the DC motor assembly, located between thebattery packs. DC models with Drive option areequipped with two pumps; DC models withoutDrive are equipped with one.Bi-Fuel models: The hydraulic pumps areattached to both the engine and the hydraulicmotor assembly, located between the batterypacks. Bi-Fuel models with Drive option areequipped with four pumps; Bi-Fuel models withoutDrive are equipped with two.When 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.How to Test the Hydraulic PumpThis procedure will require twopeople.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 spray2 Connect a 0 to 5000 psi / 0 to 350 bar pressuregauge to the high pressure port on the pump.3 Gasoline engine models: Turn the manual fuelshutoff knob to the off position.Diesel engine models: Hold the manual fuelshutoff lever in the closed position.4 Turn the key switch to ground control and pullout the red Emergency Stop button to the onposition at both the ground and platformcontrols. Pull out the red Emergency Stopbutton to the on position at the drive controls (ifequipped).5 Engine models: Observe the pressure gaugewhile cranking the engine using the key switchat the engine.DC models: Observe the pressure gauge whileactivating any boom function from the groundcontrols.Result: If the pressure gauge reads3000 psi / 207 bar, immediately stop. The pumpis good.Result: If the pressure fails to reach3000 psi / 207 bar, the pump or the coupling isbad and will need to be serviced or replaced.Component damage hazard. Thehydraulic pump can be damaged ifthe pressure exceeds3000 psi / 207 bar.6 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 Pumps800-610-4101ActionRental.com
