Genie S-65 XC Service And Repair Manual

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Contents

Genie S-65 XC Service And Repair Manual Manual pdf 101 page image

September 2018 Service and Repair ManualManifoldsPart No. 1288652GT S® -60 XC ™ • S® -65 XC ™ 91How to T est a Coil Di odeHow to Test a Coil DiodeGenie incorporates spike suppressing diodes in allof its directional valve coils except proportionalvalves and those coils with a metal case. Properlyfunctioning coil diodes protect the electrical circuitby suppressing voltage spikes. Voltage spikesnaturally occur within a function circuit following theinterruption of electrical current to a coil. Faultydiodes can fail to protect the electrical system,resulting in a tripped circuit breaker or componentdamage.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, How toTest 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 more whenmeasured across the terminals.1 multimeter2 9V DC battery3 10Ω resistor4 coilNote: Dotted lines in illustration indicate a reversedconnection as specified in step 6.3 Set a multimeter to read DC current.Note: The multimeter, when set to read DC current,should be capable of reading up to 800 mA.4 Connect the negative lead to the other terminalon the coil.Note: If testing a single-terminal coil, connect thenegative lead to the internal metallic ring at eitherend of the coil.5 Momentarily connect the positive lead from themultimeter to the positive terminal on the 9VDC battery. Note and record the currentreading.6 At the battery or coil terminals, reverse theconnections. Note and record the currentreading.Result: Both current readings are greater than0 mA and are different by a minimum of 20%.The coil is good.Result: If one or both of the current readingsare 0 mA, or if the two current readings do notdiffer by a minimum of 20%, the coil and/or itsinternal diode are faulty and the coil should bereplaced