Danfoss PVG 32 Service Manual

Also see for PVG 32: Technical information Service and parts manual Service manual Installation guide Installation guide

Contents

Danfoss PVG 32 Service Manual Manual pdf 17 page image

Cause Check Corrective actionCylinder/motor load too high forpressure settings of systemCheck load pressure at PVB-LS port Reduce load pressure if exceeds maximum pressure limitof the systemMaximum system pressure should be approx. 25Bar [365 PSI] above highest load pressureAdjust maximum system pressure if necessaryAdjust pump pressure compensator setting ifnecessaryCylinder/motor operates without remote controller being operatedCause Check Corrective actionSpool control tension rod loose Confirm torque on spool control tension rod Torque to 8 Nm [70 lbf•in]Electrical feedback transducer not inneutral positionCheck the feedback pin in the PVE. It should be loose Replace transducerRemote electrical controller neutralposition switch faultyDisconnect the connection at the PVE. It should come back toneutralRepair or replace faulty switch or wiring atremote controllerSticking pressure control valve in remotehydraulic controllerDisconnect the hydraulic signal line from valve Repair or replace faulty remote hydrauliccontrollerSticking main spool in valve section Remove manual, electrical, and hydraulic actuators from thevalve section. Remove main spool from valve section andinspected for damage. If no damage reinstall the main valvespool. Spool should move freely in the valve section bore.Replace the valve module and main spool ifany damage is found on the main spoolInternal fault in the PVE/PVEH/PVEM/PVEOPVEO check continuity. All other PVE, check LED (Red meansinternal error)Replace faulty PVE/PVEH/PVEM/PVEOContamination in the hydraulic oil Take oil samples to confirm Flush hydraulic system. Fill with cleanfiltered oil.Cylinder/motor responds slowly to remote electrical or hydraulic controller actuationCause Check Corrective actionInsufficient system pressure Install pressure gauge and record pressure If pressure is low adjust pressure setting to valvespecification or pump manufacturers specificationMain spool travel limited Check stops on manual lever controller end for properadjustment.Refer to Component troubleshooting section.Adjust the manual lever stops and torque the jam nuts to8 Nm [70 lbf•in] Do not exceed maximum torqueIncorrect signal voltage fromelectrical controllerCheck the signal voltage from the controller with avolt meterIf signal voltage is incorrect repair or replace electricalcontrollerIncorrect hydraulic pressure signalfrom remote hydraulic controllerCheck pressure from the remote hydraulic controller -25 Bar [360 PSI]If pressure is too low, repair or replace remote hydrauliccontroller per manufacturers instructions.Insufficient pilot oil - all sections Check pilot for contamination and correctlyassembled parts - 10-15 bar [145-218 psi] Electric - 25bar [360 psi] HydraulicReplace inlet module NOTE: Check with S-D TSTInsufficient LS pump stand bypressureCheck pilot PSI - 10-15 bar [145-218 psi] Electric - 25bar [360 psi] HydraulicAdjust or replace pumpFlow is not load independent PVLP check for cracksCheck LS pressure vs load pressureReplace valveErratic cylinder/motor response to electrical or hydraulic controller operationCause Check Corrective actionElectrical actuator faulty Check signal from controller to PVE Repair or replace PVEMain spool centering springdamagedCheck tension rod for correct torque or damage Torque to 8 Nm [70 lbf•in] or replaceService ManualPVG 32 Proportional Valve GroupSystem Troubleshooting© Danfoss | February 2017 11039167 | AX00000031en-US0301 | 17