TM 10-4320-303-13Table 4-7. Unit Troubleshooting Table.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. 20,000 GALLON PILLOW TANK IS NOT BEING FILLED.Step 1. Check to see if pressure-reducing valve assembly is damaged.Refer to paragraph 4.11.5 and replace pressure-reducing valve assembly.Step 2. Refer to applicable technical manual and troubleshoot 20,000 gallonpillow tank.2. PRESSURE-REDUCING VALVE ASSEMBLY WILL NOT ALLOW WATER TO FLOW.WARNINGAssembly may be pressurized. Personal injury may result if pressure is notreduced before performing maintenance on pressure-reducing valve assembly.Step 1. Check isolation tubing for obstructions.a. If found, remove obstructions.Step 2. Close inlet isolation cock valve.a. If valve opens, replace regulator control.b. If valve remains closed, notify direct support maintenance.3. PRESSURE-REDUCING VALVE IS NOT REDUCING PRESSURE.WARNINGAssembly may be pressurized. Personal injury may result if pressure is notreduced before performing maintenance on pressure-reducing valve assembly.Step 1. Check isolation tubing for obstruction.a. If found, remove obstructions.Step 2. Ensure that inlet and cover isolation cock valves are open, then close outlet isolation cock valve.a. If main valve closes, replace pressure-reducing control valve.b. If main valve opens, notify direct support for diaphragm and spring maintenance.4. HYPOCHLORINATION UNIT, MODEL 1955-1 PRESSURE GAUGE SHOWS HIGH PRESSURE.Check pressure gauge for damage.Refer to paragraph 4.13.3 and replace pressure gauge.5. HYPOCHLORINATION UNIT, MODEL 1955-1 CAMSHAFT IS TURNING BUT SPRING IS NOT MOVING.Check to see if pressure regulator setting is not accurate. Correct valve setting.4-11
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