TM 9-2350-247-20-1PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDINGLUBRICATION INSTRUCTIONS — Continued0128 00ITEMNO.INTERVALMAN-HOURITEM TO BECHECKED ORSERVICEDCREWMEMBERPROCEDUREEQUIPMENTNOT READY/AVAILABLEIF:f. Check heater control box, switches, and lightbulb. Tighten or replace bad switches and bulb(WP 0474 00).g. Start, run, and stop heater (see your –10).During start cycle, check that switches andlights work properly.h. During operation, check for unusual noises.Check for increase in coolant temperature.i. When stopping heater, check for correct purgecycle. Check that indicator light works right. Ifheater does not operate as specified above,perform troubleshooting (WP 0086 00).0128 00-75
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