TM 9-2350-247-10CHECK INSTRUMENT PANEL (M548A1) — Continued 0018 004. The HI TEMP DIFF OIL light will come ON if the temperature of the differential oil goes above 300F to 310F (149Cto 154C). Then you have to troubleshoot the differential (WP 0055 00).5. The coolant temperature gauge may show a normal operating temperature between 160F and 230F (71C and 110C).Any temperature in this range is OK. If the temperature goes higher than 230F (110C), troubleshoot the engine(WP 0055 00). Normally the temperature won’t go below 160F (71C) once the engine warms up unless you have toidle in arctic temperatures (below -25F (-32C)). If the coolant temperature drops to 140F (60C), run the engine at1200–1500 rpm until it warms up. If the temperature gauge doesn’t work, notify unit maintenance.6. The battery-generator gauge actual conditions are: LOW (left red zone) = Dead battery or short circuit; DISCHARGE(yellow zone) = Upper (right) half OK with engine off, lower (left) half indicates low battery; CHARGE (green zone) =OK with engine on; HIGH (right red zone) = Overcharge. If the needle stays in either red (low or high) zone, shut downengine and notify unit maintenance. The pointer can vary to the right or left depending on battery condition or electricalequipment in use.END OF TASK0018 00-2
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