Terex Genie Z-45 XC Service And Repair Manual

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November 2020 Service and Repair ManualManifoldsPart No. 1268197GT Z®-45 XC™ • Z®-45 HF 758-9Valve CoilsHow to Test a CoilA properly functioning coil provides anelectromotive force which operates the solenoidvalve. Critical to normal operation is continuitywithin the coil that provides this force field.Electrocution/burn hazard.Contact with electrically chargedcircuits could result in death orserious injury. Remove all rings,watches and other jewelry.1 Tag and disconnect the wiring from the coil tobe 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 SpecificationProportional directional solenoid valve, 10VDC6 to 8Ω(schematic items BP, BU and BY)3 position 4 way directional valve, 10V DC 6 to 8Ω(schematic items BF, BM and CG)2 position 3 way solenoid valve, 10V DC 6 to 8Ω(schematic items CA, CC, AF, AG and AI)How to T est a Coil Di odeHow to Test a Coil DiodeProperly functioning coil diodes protect theelectrical circuit by suppressing voltage spikes.Voltage spikes naturally occur within a functioncircuit following the interruption of electrical currentto a coil. Faulty diodes can fail to protect theelectrical system, resulting in a tripped circuitbreaker or component damage.Electrocution/burn hazard.Contact with electrically chargedcircuits could result in death orserious injury. Remove all rings,watches and other jewelry.1 Test the coil for resistance. Refer to RepairProcedure, How to Test a Coil.2 Connect a 10Ω resistor to the negativeterminal of a known good 9V DC battery.Connect the other end of the resistor to aterminal on the coil.Resistor, 10ΩGenie part number 27287Note: The battery should read 9V DC or morewhen measured across the terminals.