TM 10-4320-310-14Section IV. TROUBLESHOOTING4-9. TROUBLESHOOTINGa. Table 4-2 contains troubleshooting information for locating and correcting most of the operating troubles whichare the responsibility of unit maintenance. Each malfunction for an individual component, unit, or system is followed by alist of tests or inspections which will help you to determine probable causes and corrective actions to take. Perform thetests/inspections and corrective actions in the order listed.b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If amalfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.c. Only those functions within the scope of unit maintenance are listed. For troubleshooting procedures within thescope of operator maintenance, refer to table 3-1.4-10. SYMPTOM INDEXRefer to the Symptom Index below. Locate the malfunction which is the same, or most nearly the same, as the troubleyou are having with the centrifugal pump unit. The Symptom Index lists the first page of the troubleshooting informationfor that malfunction. Follow the steps one by one, and perform the corrective actions listed.Symptom IndexMalfunctionNumberDescriptionPage1Engine fails to crank4-72Engine cranks but fails to start4-73Engine runs unsteadily and power output is low4-94Dense smoke from exhaust after warm-up4-95Engine overheats4-96Pump makes excessive noise4-97Pump output low4-9Table 4-2. Unit Maintenance TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE FAILS TO CRANKCorrection of malfunction is beyond unit maintenance.Notify direct support maintenance.2. ENGINE CRANKS BUT FAILS TO STARTStep 1.Check that extra fuel button has been pulled out prior to starting.Pull out extra fuel button and attempt to start engine (para 2-4.c)Step 2.Check non-return valve for proper function4-7
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