TM 10-5410-221-14/1
Table 4-2. Troubleshooting--Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Inspect the check valve to see if it is clogged or blocked.
Replace valve as follows:
a. Removal
(1) Disconnect inlet and outlet fittings from check valve (1, fig. 4-11) located directly behind centrifugal
pump in water service inlet box.
(2) Remove check valve (1) from water service box.
(3) Remove expander fitting from valve (1) and remove packing (2).
b. Installation
(1) Install new packing (2, fig. 4-11) on check valve (1) and install expander.
(2) Position check valve (1) with the arrow pointing down-stream and tighten fittings on check valve (1).
1. Check valve
3. Sump
5. Washer
7. Pump
2. Packing
4. Nut
6. Clamp
Figure 4-11. Plumbing System Installation, Parial Disassembly (TS 013751)
4-60