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Page Title: VALVE HANDLE WILL NOT OPERATE
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TM 5-4210-220-12 Table 4-2 UNIT TROUBLESHOOTING - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2c VALVE HANDLE WILL NOT OPERATE Visually inspect rod valve linkage and valve to determine which component is causing the stiffness. Replace component(s) that have failed, (see para. 4-13). 2d VALVE HANDLE WILL NOT LOCK IN POSITION Step 1 Threads stripped on rod or block. Replace rod and/or block. Step 2 Rod out of adjustment. Remove spring pin in lower end, turn handle one half turn and replace spring pin. 2e WATER OR FOAM GAGE NOT FUNCTIONING Step 1 Check cab level gage. a If cab gage working, replace pump body level gage. b If cab gage behaving same as pump body, check wiring to sensor. c If wiring is OK, check/clean level sensor. Step 2 Bulbs failed/missing. Replace bulbs. Step 3 Failed wire, harness plug, or circuit breaker. Replace failed component. 2f AGENT DISCHARGE GAGE NOT OPERATING Step 1 Gage failed. Replace gage, (see para. 4-24). Step 2 Water pressure line blocked or disconnected at either end. Replace/tighten hose or connections as required. 4-24

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