TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING LUBRICATION INSTRUCTIONS — Continued 0128 00 ITEM NO. INTERVAL MAN- HOUR ITEM TO BE CHECKED OR SERVICED CREWMEMBER PROCEDURE EQUIPMENT NOT READY/ AVAILABLE IF: 88 Semi- Annual Idle Test C A U T I O N Avoid lengthy engine idling. This causes coolant temperature to drop below operating temperature and can shorten engine life. NOTE After a successful road test, perform engine idle and governed no load test only. The stall check is not required unless engine or transmission discrepancies warrant additional fault isolation. a. Run engine at 800 to 1000 rpm for 3-5 minutes with range selector in 2-3 range and brakes locked until normal operating temperature is reached. Engine runs hot or rough. b. If outside air temperature is less than 85 degrees F (29 degrees C), normal operating temperature should be 160 to 200 degrees F (71 to 93 degrees C). If outside air temperature is greater than 85 degrees F (29 degrees C), normal operating temperature should be 160 to 230 degrees F (71 to 110 degrees C). c. With range selector in N (M548A1) or SL (M548A3), engine should idle smoothly at 650 to 700 rpm. d. High and low engine idle speed is usually caused by accelerator linkage being out of adjustment. Adjust linkage if necessary (WP 0197 00 or WP 0200 00). e. Rough idling is usually caused by faulty injector timing and rack setting, faulty injectors, or air in the injection system. Notify your supervisor. 0128 00-109 Change 1