Genie GR-12 Service Manual

Contents

Genie GR-12 Service Manual Manual pdf 79 page image

Section 4 • Repair ProceduresREV ANovember 2005Part No. 84700 GR-12 • GR-15 • GR-20 4 - 314 Turn the key switch to platform control and pullout the red Emergency Stop button to the onposition at both the ground and platformcontrols.5 Activate the function enable switch and pressand hold the steer thumb rocker switch to theright. Allow the wheels to completely turn to theright. Continue holding the switch whileobserving the pressure reading on the pressuregauge. Note the pressure. Refer to Section 2,Specifications.6 Press and hold the steer thumb rocker switch tothe left. Allow the wheels to completely turn tothe left. Continue holding the switch whileobserving the pressure reading on the pressuregauge.7 Turn the machine off. Hold the steer relief valvewith a wrench and remove the cap (schematicitem G).8 Adjust the internal hex socket. Turn it clockwiseto increase the pressure or counterclockwise todecrease the pressure.Component damage hazard. Donot adjust the relief valvepressures higher thanspecifications.9 Install the relief valve cap.10 Repeat steps 5 through 6 to confirm the reliefvalve pressure.FUNCTION MANIFOLD6-3Valve CoilsHow to Test a CoilA properly functioning coil provides anelectromotive force which operates the solenoidvalve. Critical to normal operation is continuitywithin the coil that providess this force field.Electrocution hazard. Contact withelectrically charged circuits couldresult in death or serious injury.Remove all rings, watches andother jewelry.1 Tag and disconnect the wire harness from thecoil to be tested.2 Test the coil resistance.Result: The resistance should be withinspecification, plus or minus 30%.Result: If the resistance is not withinspecification, plus or minus 30%, replace thecoil.Valve Coil Resistance SpecificationsDescription SpecificationSolenoid valve, 3 position 4 way 18 to 21Ω20V DC with diode (schematic items E)Solenoid valve, 3 position 4 way 25 to 28Ω20V DC with diode (schematic item F)Solenoid valve, 2 position 4 way 18 to 21Ω20V DC with diode (schematic item H)Solenoid valve, 2 position 2 way N.C. 7.5 to 10.5Ωwith manual override12V DC with diode (schematic item N)