TM 5-4320-200-13&P4-4. CENTRIFUGAL PUMP.The centrifugal pump is coupled to the gasoline engine or electric motor. The pump casehouses the impeller, wear plate, and seal and serves as a water chamber with suction and dischargeports. The volute, which bolts to the front of the pump case, completely encirles the impeller. A checkvalve prevents water backflow through the pump.4-4.1. Troubleshooting.- -Table 4-2 is used for organizational maintenance activity troubleshooting. This table is to beused in conduction with the preventive maintenance table contained in paragraph 2-2.Table 4-2. Maintenance Activity Troubleshooting.M A L F U N C T I ONTEST OR INSPECTIONCORRECTIVE ACTION1.PUMP FAILS TO PUMP TO RATED CAPACITY.Step 1- Check if check valve is defective.Replace check valve. (Refer to para 4-4.3)Step 2- Check if impeller is clogged or broken.Flush pump case or replace impeller. (Refer to para 4-4.2)Step 3- Check pump case for leaks, cracks, or damage.Repair or replace case. (Refer to para 4-4.2)Step 4- Check if packing seals are worn or defective.Replace packing seals. (Refer to para 4-4.2)Step 5- Check if clearance between wear plate and impeller is excessive,Install shims as required. (Refer to para 4-4.2)2. PUMP FAILS TO PRIME.Step 1- Check if check valve is defectiveReplace check valve. (Refer to para 4-4.3)Step 2- Check if suction flange is loose or defective,Tighten mounting nuts or replace suction flange. (Refer to para 4-4.3)Step 3- Check if packing seals are worn or defective.Replace impeller. (Refer to para 4-4.2)4-12Change 5
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