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TROUBLESHOOTINGPossible Symptoms:• Pump will not cycle.• Pump cycles, but produces no flow.• Pump cycles, but flow rate isunsatisfactory.• Pump cycle seems unbalanced.• Pump cycle seems to produceexcessive vibration.What to Check: Excessive suction liftin system.Corrective Action: For lifts exceeding20 feet (6 meters), filling the pumpingchambers with liquid will prime thepump in most cases.What to Check: Excessive floodedsuction in system.Corrective Action: For floodedconditions exceeding 10 feet (3 meters)of liquid, install a back pressure device.What to Check: System head exceedsair supply pressure.Corrective Action: Increase theinlet air pressure to the pump. Mostdiaphragm pumps are designed for 1:1pressure ratio at zero flow.What to Check: Air supply pressure orvolume exceeds system head.Corrective Action: Decrease inletair pressure and volume to thepump as calculated on the publishedPERFORMANCE CURVE. Pump iscavitating the fluid by fast cycling.What to Check: Undersized suctionline.Corrective Action: Meet or exceedpump connection recommendationsshown on the DIMENSIONALDRAWING.What to Check: Restricted orundersized air line.Corrective Action: Install a largerair line and connection. Refer to airinlet recommendations shown in yourpump’s SERVICE MANUAL.What to Check: Check ESADS, theExternally Serviceable Air DistributionSystem of the pump.Corrective Action: Disassemble andinspect the main air distribution valve,pilot valve and pilot valve actuators.Refer to the parts drawing and air valvesection of the SERVICE MANUAL.Check for clogged discharge or closedvalve before reassembly.What to Check: Rigid pipe connectionsto pump.Corrective Action: Install flexibleconnectors and a surge suppressor.What to Check: Blocked air exhaustmuffler.Corrective Action: Remove mufflerscreen, clean or de-ice and reinstall.Refer to the Air Exhaust section of yourpump SERVICE MANUAL.What to Check: Pumped fluid in airexhaust muffler.Corrective Action: Disassemblepump chambers. Inspect for diaphragmrupture or loose diaphragm plateassembly. Refer to the DiaphragmReplacement section of your pumpSERVICE MANUAL.What to Check: Suction side airleakage or air in product.Corrective Action: Visually inspectall suction side gaskets and pipeconnections.What to Check: Obstructed checkvalve.Corrective Action: Disassemble thewet end of the pump and manuallydislodge obstruction in the check valvepocket. Refer to the Check Valvesection of the pump SERVICE MANUALfor disassembly instructions.What to Check: Worn or misalignedcheck valve or check valve seat.Corrective Action: Inspect checkvalves and seats for wear and properseating. Replace if necessary. Referto Check Valve section of the pumpSERVICE MANUAL for disassemblyinstructions.What to Check: Blocked suction line.Corrective Action: Remove or flushobstruction. Check and clear all suctionscreens and strainers.What to Check: Blocked dischargeline.Corrective Action: Check forobstruction or closed discharge linevalves.What to Check: Blocked pumpingchamber.Corrective Action: Disassembleand inspect the wetted chambersof the pump. Remove or flush anyobstructions. Refer to the pumpSERVICE MANUAL for disassemblyinstructions.What to Check: Entrained air or vaporlock in one or both pumping chambers.Corrective Action: Purge chambersthrough tapped chamber vent plugs.PURGING THE CHAMBERS OF AIRCAN BE DANGEROUS! Contact theWarren Rupp Technical Service Teambefore performing this procedure. Amodel with top-ported discharge willreduce or eliminate problems withentrained air.If your pump continues to performbelow your expectations, contact yourlocal Warren Rupp Distributor or factoryTechnical Service Team for a serviceevaluation.WARRANTYRefer to the enclosed Warren RuppWarranty Certificate.m07nmdl1sm-rev0513 Models M07 Non-Metallic Page 9