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FIGURE 3-1. PREVENTIVE MAINTENANCE SERVICES
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TM-5-4320-254-14 Pump Centrifugal Gasoline Engine Driven (MIL STD) 600 GPM (E.C. Schleyer Pump (O. Model 36M-SPS3011G-T) Manual
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ELECTRICAL SYSTEM - TM-5-4320-254-140043
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
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 &
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.
-14-

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