Genie GTH-5519 Service And Repair Manual

Also see for GTH-5519: Maintenance manual Original instructions

Genie GTH-5519 Service And Repair Manual Manual pdf 56 page image

3-34 GTH-5519 Part No. 1272852September 2016Section 3 • Repair Procedures7-2Valve CoilsHow to Test a CoilA properly functioning coil provides anelectromagnetic force which operates thesolenoid valve. Critical to normal operation iscontinuity within the coil. Zero resistance or infiniteresistance indicates the coil has failed.Since coil resistance is sensitive to temperature,resistance values outside specification canproduce erratic operation. When coil resistancedecreases below specification, amperageincreases. As resistance rises above specification,voltage increases.While valves may operate when coil resistanceis outside specification, maintaining coils withinspecification will help ensure proper valve functionover a wide range of operating temperatures.WARNING Electrocution/burn hazard.Contact with electrically chargedcircuits could result in death orserious injury.Remove all rings, watches andother jewelry.Note: If the machine has been in operation, allowthe coil to cool at least 3 hours before performingthis test.1 Tag and disconnect the wiring from the coil tobe tested.2 Test the coil resistance using a multimeterset to resistance (). Refer to the Valve CoilResistance Specification table.Result: If the resistance is not within theadjusted specification, plus or minus 10%,replace the coil.Valve Coil ResistanceSpecifi cationNote: The following coil resistance specificationsare at an ambient temperature of 68°F / 20°C. Asvalve coil resistance is sensitive to changes inair temperature, the coil resistance will typicallyincrease or decrease by 4% for each 18°F / 20°Cthat your air temperature increases or decreasesfrom 68°F / 20°C.Description SpecificationSteering modes selector valve,3 position 4 way12V DC with diode5.6Mechanical gear speed Selectorvalve, 3 position 4 way12V DC with diode8.8Forward/Reverse Selector valve,3 position 4 way12V DC with diode8.8Outrigger Selector valve,2 position 4 way12V DC with diode8.8MANIFOLDS