... SYMPTOMS AND CAUSES OF FAILURE FOR POSITIVE DISPLACEMENT PUMPS Symptom Possible Cause Pump fails to discharge liquid. Noisy pump. 6 ,10 ,11 ,I 6 ,17 ,18 ,19 Pump wears rapidly. 11 ,12 ,13 ,16 ,20,23 ... 17 -1) . INCORRECT CORRECT Figure 17 -1 PUMP FMp PUMP E PUMP 238 Common Sense Failure Analysis Source of Problem Suggested CauselRemedy 8. 9. IO. 11 . 12 . 13 . 14 . 15 . 16 . 17 . ... per Second. 16 12 8 4 0 Minumum Submergence in Feet Figure 17 -12 - 243 Know and Understand Centrifugal Pumps ir" U Ficlure 14 -24 Install the pump back plate and seal chamber...