TM 10-4320-310-14Table 3-1. Operator Troubleshooting (Continued)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION10. PUMP FAILS TO PRIMEStep 1.Check for low engine speed.Move throttle control hand lever to left past the stop.Step 2.Check for air-locked pump.Vent the pump housing and fill with flammable liquid (para 2-4.b).Step 3.Check for leaks at the suction (intake) flange and gasket.Replace gasket.11. NOISY PUMP OPERATIONCAUTIONExcessive pump noise can Indicate that pump is running dry. Thiscondition can cause serious pump damage.Step 1.Check that suction hose is properly connected to container from which flammableliquids being pumped. Flammable liquid level in container shall be above suctionhose connection.Step 2.Check suction hose and coupling for foreign material.With engine stopped and suction hose removed, inspect interior of suction hoseand suction (intake) coupling for foreign material or obstruction.Step 3.Check suction hoses, connections, or suction coupling interface for leaks.Step 4.Check that pump has been properly primed.If necessary, prime the pump (para 2-4.b).Step 5.Notify unit maintenance.12. LOW DISCHARGE PRESSUREStep 1.Check for low engine speed.Move throttle control hand lever to left past the stop.Step 2Check suction (intake) line for leaking connections.Tighten loose connections.3-7
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