TM 5-4320-306-10
Table 3-1. Operator/Crew Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. PUMP FAILS TO DELIVER CAPACITY
Step 1. Check that engine speed is correct for the specific gravity of liquid being pumped. Refer to pump
performance data plate.
Adjust MANUAL THROTTLE CONTROL until engine is running at correct speed (para 2-6.g.).
Step 2. Check that suction and discharge gate valves are fully open.
Open gate valves.
Step 3. Check that suction hose (intake) is properly submerged or connected to liquid supply.
a. Submerge intake of suction hose.
b. If connection to liquid supply is leaking, notify organizational maintenance.
Step 4. Check for collapsed or damaged suction hose.
If suction hose is collapsed or damaged, notify organizational maintenance.
Step 5. Check the suction assembly components and connections for leaks. Check suction hose connection,
gate valve, spool, strainer, gaskets, and the connection between the strainer and pump assemblies.
Check that locking lever securely holds strainer in place.
a. Tighten hose connection.
b. Tighten strainer locking lever.
c. If any other leaks are found, notify organizational maintenance.
Step 6. Check for clogged suction strainer or suction hoses. Perform the checks and services of table 2-2, item
8, and clean away debris. Replace severely damaged or restricted hoses.
Clean debris from suction strainer and hose.
Step 7. Check for excessive suction lift.
Move centrifugal pump unit closer to source of liquid.
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