TM 10-3930-664-10 Location Item Interval Item to Procedure Not Fully Mission No. Check/ Capable If: Service 38 Weekly Engine Lubrication Check for oil leaks at the valve Any Class III leaks are System covers, push rod cover and evident. engine oil filter. CAB NOTE The following additional checks must be performed if your 4KRTFL is equipped with an enclosed cab. 39 Weekly Windshield Wipers a.  Check the windshield wipers Wiper blades missing or blades for cracks, tears, or damage. deterioration. b.  Check the windshield wipers Wipers inoperative. for proper operation.  Check to ensure that sweep of blades is smooth and glass is cleared of water without streaks or misses. 40 Weekly Heater Check the heater for proper operation. 41 Weekly Defroster Fans Check the defroster fans for proper operation. SECTION III.  Operation Under Usual Conditions 2-8. GENERAL It is essential that the operator know how to perform every operation of which the vehicle is capable.  This section gives instructions on starting and stopping the vehicle, on the basic motions of the vehicle, and how to use these instructions to perform specific tasks for which the equipment was designed. 2-9. NEW VEHICLE BREAK-IN. Controlled break-in is the ideal fitting of all internal moving metal parts.  Using the proper oil and preventive maintenance program during this period will provide long life of the engine. a. Starting the Engine.   See paragraph 2-10.   Warm the engine to operating temperature, 180° - 210° F (82° - 99° C), before placing the engine under load. b. Operation. (1) Avoid constant speeds. 2-26