Section III - TROUBLESHOOTING

Section III - TROUBLESHOOTING

3-7. GENERAL - This section provides information useful in diagnosing and correcting unsatisfactory operation or

failure of the centrifugal pump and its components. Each trouble symptom stated is followed by a list of probable causes,

with the possible remedy listed opposite.

NOTE: Refer to TM 5-2805-259-14 for engine troubleshooting instructions.

3-8.

PUMP ASSEMBLY FAILS TO START

Probable Cause

Possible Remedy

Battery weak or dead

Service & recharge or replace battery

(para. 3-13. C)

Engine defective

Refer to DM1 5-2805-259-14

Impeller frozen

Clean or replace impeller (para. 4-2 & 4-3.E)

Impeller clogged or Jammed

Disassemble & clean (para. 4-2)

3-9.

PUMP ASSEMBLY FAILS TO PRIME OR FAILS TO DELIVER CAPACITY

Probable Cause

Possible Remedy

No initial prime charge

Prime pump (para. 2-8)

Check valve defective

Replace check valve (para. 4-4)

Leak in lines or connections

Tighten or replace hose or piping

Suction line or strainer clogged

Clean suction line and strainer

Liner of suction hose collapsed

Replace suction hose

Suction lift too high

Move pump closer to water source level

Discharge head to high

Reduce total head

Engine speed too low

Increase engine speed (TM 5-2805-259-14)

Leakage through shaft seal

Replace shaft seal (para. 4-3)

Improper impeller clearance

Adjust impeller clearance (para. 4-3)

Impeller broken, damaged, or worn

Replace impeller (para. 4-2 & 4-3. E)

3-10. NOISY PUMP OPERATION

Probable Cause

Possible Remedy

Clogged suction strainer

Remove and clean strainer

Vortex Move suction line further into water source

Impeller loose, broken, or damaged

Tighten or replace impeller (para. 4-2 &

4-3. E)

Intermediate bearing defective

Replace bearing (para. 4-3)

3-11. PUMP ASSEMBLY LEAKS

Probable Cause

Possible Remedy

Suction or discharge connections loose

Tighten connections

Bolts on gasketed joints loose

Tighten bolts

Gaskets defective

Replace gaskets (para. 4-4. D & 4-4. E)

Seal defective

Replace seal (para. 4-3)

Pump body defective

Repair or replace pump (para. 4-2)

Section IV - REPAIR AND PARTS REPLACEMENT

3-12. SCOPE

This section covers only those parts that are assembled and/or installed by the manufacturer. TM 5-2805-259-14,

covers repair and parts replacement for the Military Standard engine.

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