TM 10-4610-240-10
TM 08580C-10/1
T.O. 40W4-13-21
Table 3-2. Troubleshooting (ROWPU) (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
BACKWASH PUMP RUNS CONTINUOUSLY. (Continued)
Step 2.
Notify unit maintenance to troubleshoot BACKWASH TIMER and its electrical wires.
8.
BACKWASH WATER FLOW READING DROPS TO NEAR ZERO DURING BACKWASH OPERATION;
BACKWASH PUMP LAMP IS ON.
Step 1.
Check for closed or clogged valve on tank.
a. Open closed valve by turning handle fully to the left until it stops (counterclockwise).
b. Clean clogged valve.
Step 2.
Check for clogged strainer or BACKWASH PUMP suction opening (paragraph 36).
a. Flush strainer with product water to remove debris.
b. Remove debris from suction opening.
Step 3.
Check level of water in backwash water tank.
NOTE
There is a period of about 15 seconds when the flow gauge will drop to "0" before returning to normal
reading. This is normal.
If water level is below backwash pump intake, immediately shut off backwash pump. Patch any leaks
in backwash water tank (refer to TM 5-5430-227-12&P).Fill tank with raw water and continue
backwash operation.
Step 4.
Check for leaking hose.
Replace defective hose.
Step 5.
Check for kinked hoses.
Unkink hoses.
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