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TM 5-4320-304-14
TM 08922A-14/1
Table 4-2. Organizational Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. PUMP MAKES EXCESSIVE NOISE
Step 1.
Check volute for foreign material.
With engine stopped and suction hose removed, inspect interior of suction
(intake) flange for foreign material or obstruction.
Excessive pump noise can indicate that pump
is running dry. This condition can cause serious
pump damage.
Step 2.
Check that suction hose is immersed in water or properly connected to container
from which water is being pumped. Water level in container shall be above
suction hose connection.
Relocate suction hose connection below surface of water.
Step 3.
Check suction hoses, connections, or parting surface of suction flange for leaks.
Check pipe plugs are not leaking.
Step 4.
Check that pump has been properly primed.
If necessary, prime the pump (para 2-4.b.).
Step 5.
Inspect check valve assembly for proper operation. Perform the checks and
services of table 4-1, item 2.
Replace check valve assembly (para 4-12).
Step 6.
Notify direct support maintenance.
7. PUMP OUTPUT LOW
Step 1.
Check that engine speed is properly adjusted.
Adjust throttle lever to increase engine speed (para 2-4.d.).
Step 2.
See Malfunction 6, steps 1 thru 5.
4-12
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