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TM 10-4320-307-10
Table 3-1. Operator/Crew Troubleshooting (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
10.
PUMP FAILS TO PRIME
Step 1.
Check for loose connections causing air leaks.
If connections are loose, notify unit maintenance.
Step 2.
Check that engine speed is correct for the specific gravity of liquid being pumped. Refer to pump
performance data plate.
Adjust ENGINE/PUMP CONTROLLER knob until engine is running at correct speed (paragraph 2-
5).
Step 3.
Check for restrictions in flow through suction and discharge piping.
Perform the checks and services of Table 2-2, item 38. Notify unit maintenance of severely
damaged piping.
Step 4.
Check gasket in suction pipe.
Replace gasket if required.
Step 5.
Check for obstruction in suction pipe.
If there is an obstruction, remove.
Step 6.
Ensure pump is not air or vapor locked.
Vent pump casing using air vent valves.
Step 7.
Ensure engine is running at rated speed.
Adjust engine speed (paragraph 2-5).
Step 8.
Check for leaking seals.
If seals leak, notify unit maintenance.
11.
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 ENGINE/PUMP CONTROLLER knob until engine is running at correct speed (paragraph 2-
5).
Step 2.
Check that suction and discharge gate valves are fully open.
Open gate valves.
Step 3.
Check that suction pipe (intake) is properly connected to fluid supply.
If connection to liquid supply is leaking, tighten flange bolts and/or replace coupling gasket.
Step 4.
Check for damaged suction pipe.
If suction pipe is damaged, replace.
3-7
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