TM 10-4610-234-13
Table 4-2. Unit Troubleshooting. (cont.)
Malfunction
Test or Inspection
Corrective Action
5. CHECK VALVE STUCK CLOSED.
Step 1. Inspect valve for contaminants stuck in valve body.
Repair check valve (refer to para. 4.28).
Step 2. Push on inlet side of check valve flapper. Flapper should open and close freely without
binding or sticking.
Repair check valve (refer to para. 4.28).
6. TEE ASSEMBLY LEAKS.
Step 1. Check for damaged or missing coupling gaskets.
Replace gaskets (refer to para. 4.15).
Step 2. Check for cracked quick disconnect couplings and/or tee body.
Replace tee assembly (refer to para. 4.15).
7. DISTRIBUTION NOZZLE(S) WILL NOT SHUT OFF WHEN CONTROL LEVER IS RELEASED.
Check operation of distribution nozzle(s). Control stem should extend when control lever is re-
leased.
Replace distribution nozzle(s) (refer to para. 4.16 and/or 4.20).
8. WATER PRESSURE REGULATOR LEAKS.
Step 1.
Step 2.
Step 3.
Check for loose bolts on regulator body.
Tighten bolts.
Check for damaged or missing coupling gaskets.
Replace water pressure regulator (refer to para. 4.17).
Check for cracked quick disconnect coupling.
Replace water pressure regulator (refer to para. 4.17).
9. WATER PRESSURE AT HOSE AND NOZZLE KIT IS TOO HIGH OR TOO LOW.
Check setting of pressure regulator.
Adjust pressure regulator (refer to para. 4.17).
If regulator cannot be adjusted, replace regulator (refer to para. 4.17).
10. WATER METER LEAKS.
Step 1. Check for damaged or missing coupling gaskets.
Replace gaskets (refer to para. 4.25).
Step 2. Check for cracked quick disconnect coupling.
Replace couplings (refer to para. 4.25).
NOTE
If leak cannot be corrected, replace water meter.
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