# [Troubleshooting Guide for Ineffective Pumping of Second hand Drag Pump](http://en.cstygcjx.com/newsDetail/406.html "Troubleshooting Guide for Ineffective Pumping of Second hand Drag Pump") ‌**摘要：**‌After a period of use, second-hand concrete pumps may occasionally experience a decrease in pumping pressure and a slower pumping speed. Most of these problems are not serious malfunctions, and can be quickly located and resolved through system troubleshooting, avoiding unnecessary maintenance expenses and downtime losses. ‌**标签：**‌ ‌**作者：**‌ ‌**来源：**‌ ‌**浏览量：**‌18 ‌**发布时间：**‌2026-06-11 17:01:21 ‌**扩展信息：**‌外链- ‌**图片：**‌https://overseas-web.bj.bcebos.com/tygcjx/upload_files/2026/06/17/d44a966874994cfc85e1b3b7ec488902.jpg ‌**详细内容：**‌Afterusingasecond-handconcretetrailerpumpforaperiodoftime,theremayoccasionallybeadecreaseinpumpingpressureandaslowerpumpingspeed.Mostoftheseproblemsarenotseriousmalfunctions,andcanbequicklylocatedandresolvedthroughsystemtroubleshooting,avoidingunnecessarymaintenanceexpensesanddowntimelosses.Phenomenondescription:Theequipmentstartsnormally,butwhenpumpingconcrete,thereisanoticeablefeelingofweakness,inconsistentdischarge,andevenpipeblockage.Step1:Checkthegapbetweentheeyeglassplateandthecuttingring.Thisisthemostcommoncauseofmalfunction.Theeyeglassplateandcuttingringarevulnerableparts,andincreasingthegapafterwearcanleadtoconcretebackflowandpressureleakage.Judgmentmethod:ObservewhetherthereismortarsprayingattheswingarmoftheSpipeinthepumpingstate.Thenormalgapshouldbecontrolledwithin1-2mm.Ifitexceeds3mm,itisrecommendedtoreplaceit.Duringtheremanufacturingprocess,ConcreteYuMachinerywillreplacealloriginalpartswithbrandnewones,whichcaneffectivelyavoidsuchproblems.Step2:Checktheoutputpressureofthemainoilpump.Connectthepressuregaugetotestwhetherthesystempressurehasreachedtheratedvalue.Ifthepressureislowbutthereisnoabnormalnoisefromtheoilpump,itmaybeduetoacloggedhydraulicoilfilteroroilemulsification.Replacethehydraulicoilandfilter.Ifthereisobviousabnormalnoiseorseverepressurefluctuationintheoilpump,themainoilpumpneedstobedisassembledandinspected.Step3:Checktheconveyingcylinderandpiston.Wearofthechromeplatinglayerontheconveyingcylinderoragingofthepistonsealingringcanalsocausepressureleakage.Youcanopenthedischargeporttoobservewhetherthereisalargeamountofmortarenteringthewatertanktodetermine.WangMaqiang,whohas15yearsofafter-salesexperienceatSanyHeavyIndustry,suggeststhatafterreceivingsecond-handequipment,itisrecommendedtoreplacethehydraulicoilandfilterelementwithin200workinghours,andregularlychecktheclearancebetweentheeyeglassplates.Keepinggoodmaintenancerecordsonadailybasiscannotonlyreducethefailurerate,butalsoincreasethevalueofequipmentwhenitistransferredinthefuture.IsthedeviceexperiencingdifficultmalfunctionsConcreteTongYuMachineryprovideslifelongonlinetechnicalguidanceandprofessionalengineersprovideonlineanswers.Ifyouneedon-sitemaintenanceorremanufacturingservices,pleasefeelfreetoconsultatanytime.