Table 4-1.  Troubleshooting Cont’d. CAUSE OF TROUBLE CHECKING PROCEDURE CORRECTION B. Low water level Water delivery good on start up Throttle pump delivery in well but diminishes.  Pump capacity through restricting too great for well production. valve.  Lower pump Pump may be set in sand. setting if depth of well is adequate. C. Pump rotation Lower water delivery or low pres- Rotation can be correct- wrong sure may indicate pump operating ed by properly connecting in wrong direction. 10 3-wire units or by interchanging two leads of 30 units. D. Check valve stuck No water will be delivered if Valve must be reversed. or installed im- valve is installed with flow arrow properly in wrong direction. If drop pipe is screwed into the Cut off a portion of the pump check valve too deeply it threads on the drop pipe. may be jammed in the closed position. E. Leak in drop pipe Although water is being supplied Raise pipe, check for to tank the pump may not deli- leak and replace damaged ver sufficient pressure to shut section. off the system.  The "on" por- tion of the cycle increases. F. Pump screen Restricted flow may indicate a Clean screen and reset blocked clogged intake screen on pump. at less depth.  It may be Pump may be installed in mud or necessary to clean well. sand. G. Worn pump Symptoms of worn pump are simi- Pull pump and replace lar to those of drop pipe leak or worn impellers, casing low water level in well. Reduce or other close fitting pressure switch setting, if pump parts. shuts off worn parts may be at fault.  Sand is usually present in tank. H. Loose or broken No water will be delivered if coup- Check for damaged motor shaft ling between motor and pump shaft shafts if coupling is is loose or if a jammed pump has loose and replace worn caused the motor shaft to sheer or defective units. off. 4-15