4-4
TM 10-4930-220-13&P
Section IV. UNIT MAINTENANCE TROUBLESHOOTING
4-8. General.
a.
This section contains troubleshooting information for locating and correcting problems which develop
in the tank unit that are within the scope of unit maintenance. Each malfunction for an individual component, unit
or system is followed by a list of tests or inspections to help to determine corrective actionsfor specific malfunctions.
Perform the tests/inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective ac-
tions. If a malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
c.
For unit maintenance troubleshooting refer to Table 4-2.
Table 4-2. UNIT MAINTENANCE TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. PRODUCT DISCHARGE IS NOT CLEAN.
Step 1.
Check product in tank for contamination.
Clean and purge tank interior after product is drained.
Step 2.
Check emergency dump valve strainer screen for contamination,
Remove, clean and reinstall strainer screen.
2. FLOW OF PRODUCT SLOWS DOWN OR STOPS DURING OPERATION.
Step 1.
Check emergency dump valve strainer for contamination.
Remove, clean and reinstall strainer screen.
Step 2.
Check nozzle for distortion, damage, or leaks.
Repair or replace a defective nozzle.
Step 3.
Check hose assembly for leaks or damage.
Replace or repair hose assembly.
3. PRODUCT LEVEL IN TANK DROPS BEFORE OPERATION.
Step 1.
Check tank for leaks.
Weld, repair or replace the tank.
