Danfoss Series 45 Service Manual

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Excessive noise and/or vibrationItem Description ActionCheck fluid level in reservoir. Insufficient hydraulic fluid causes cavitation. Fill the reservoir to proper level.Check for air in system. Air in system causes noisy, erratic control. Purge air and tighten fittings. Check inlet forleaks.Check pump inlet pressure/vacuum. Improper inlet conditions cause erratic behaviorand low output flow.Correct pump inlet pressure/vacuum conditions.Refer to the Hydraulic Parameters topic.Inspect shaft couplings. A loose or incorrect shaft coupling causesexcessive noise and/or vibration.Repair or replace coupling and ensure thatcorrect coupling is used.Check shaft alignment. Misaligned shafts create excessive noise and/orvibration.Correct shaft misalignment.Hydraulic fluid viscosity above acceptable limits. Hydraulic fluid viscosity above acceptable limitsor low fluid temperature will not allow the pumpto fill or control to operate properly.Allow system to warm up before operating, oruse fluid with the appropriate viscosity grade forexpected operating temperatures. See HydraulicFluids and Lubricants Technical InformationManual, 520L0463.Actuator response is sluggishItem Description ActionCheck external system relief valve setting. Low external relief valve setting slows downsystem.Adjust external relief valve setting followingmanufacturer’s recommendations. External reliefsetting must be above PC setting to operateproperly.Check PC and LS control setting. Low PC setting prevents the pump fromachieving full stroke. Low LS setting limits outputflow.Adjust PC and LS setting. Refer to theAdjustments chapter.Check LS control signal pressures. Incorrect LS signal will not allow pump tooperate correctly.Inspect system to ensure that proper LS signaltransmit to pump.Internal system leaks. Worn internal parts don’t allow the pump tooperate properly.Refer to Authorized Service Center for requiredrepair.Hydraulic fluid viscosity above acceptable limits. Hydraulic fluid viscosity above acceptable limitsor low fluid temperature will not allow the pumpto fill or control to operate properly.Allow system to warm up before operation or suefluid with the appropriate viscosity grade forexpected operating temperatures. See HydraulicFluids and Lubricants Technical InformationManual, 520L0463.Check external system valving. Malfunctioning valving may not allow system torespond properly.Repair or replace system valving as required.Check pump case pressure. High case pressure causes the system to besluggish.Correct case drain line restrictions.Check pump inlet pressure/vacuum. High inlet vacuum causes low output flow. Correct inlet pressure conditions.System operating hotItem Description ActionCheck fluid level in reservoir. Insufficient volume of hydraulic fluid will notmeet cooling demands of system.Fill reservoir to proper level. Verify proper size ofreservoir.Inspect heat exchanger. Check air flow and inputair temperature for the heat exchanger.Insufficient air flow, high input air temperature,or undersized heat exchanges will not meetcooling demands of the system.Clean, repair, or replace heat exchanger asrequired. Verify proper size of heat exchanger.Service ManualSeries 45 E Frame Open Circuit PumpsTroubleshooting© Danfoss | September 2016 AX00000024en-US0401 | 21