TM 10-4320-317-13
Section V. UNIT TROUBLESHOOTING PROCEDURES
4-12. Unit Troubleshooting Procedures. Unit troubleshooting procedures listed in Table 4-6 cover the most common
malfunctions that may be repaired at the unit level. Repair or adjustment requiring specialized equipment is not
authorized unless such equipment is available. Troubleshooting procedures used by the operator should be conducted
in addition to the unit troubleshooting procedures. This manual cannot list all the possible malfunctions or every possible
test/inspection and corrective action. If a malfunction is not listed or corrected by a listed corrective action, notify your
supervisor.
SYMPTOM
Troubleshooting
Procedure
(Para)
Pump Suction Gage Shows Low Suction Pressure................................ ................................ ................... 1
Pump Discharge Gage Shows High Discharge Pressure ................................ ................................ .......... 2
Storage Tank Is Not Being Filled ................................ ................................ ................................ .............. 3
Pressure-Reducing Valve Won't Open or Won't Close Drip-Tight ................................ ............................. 4
20,000-Gallon Pillow Tank is Not Being Filled ................................ ................................ .......................... 5
Pressure-Reducing Valve Assembly Will Not Allow Water to Row ................................ ............................ 6
Pressure-Reducing Valve is Not Reducing Pressure ................................ ................................ ................ 7
Table 4-6. Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
PUMP SUCTION GAGE SHOWS LOW SUCTION PRESSURE.
Check to see if pressure gage is damaged.
Replace gage (refer to applicable pumping assembly technical manual).
2.
PUMP DISCHARGE GAGE SHOWS HIGH DISCHARGE PRESSURE.
Step 1.
Check to see if pressure gage is damaged.
Replace gage (refer to applicable pumping assembly technical manual).
Step 2.
Check to see if check valve is installed correctly.
Remove val ve and correctly install (para. 2-8.h.).
Step 3.
Check to see if check valve is damaged.
Replace valve (para. 2-8.h.).
4-9
