TM 9-2320-386-10 Change 1 2-53 CAUTION Shifting between neutral and drive is essential since continuous oper- ation in gear with the brakes locked will overheat the transmission and cause serious damage. Ensure transmission temperature gauge does not exceed 300°F (149°C) during the following procedures. NOTE Use only the accelerator pedal to achieve an engine idle speed of 1400 rpm. a. Apply service brake (8) and engage parking brake by pulling parking brake lever (7) up. Place the transmission shift lever (6) in DRIVE position and accelerate to 1400 rpm for 30 seconds using accelerator pedal (9). b. Return engine to normal idle (750-850 rpm), place transmission shift lever (6) in NEUTRAL, apply service brake (8), depress the accelerator pedal (9) to increase engine rpm to 1200 rpm for 30 seconds, then return engine to normal idle. c. Repeat steps a. and b. for a total of 8 minutes or until engine temperature is 160°F (71°C). d. Pull temperature control knob (2), move heater switch (4) to HIGH, and wind- shield wiper control to HIGH. CAUTION Ensure engine reaches and maintains an operating tempera- ture of 160°F (71°C) or above prior to or during step e. If engine temperature does not reach 160°F (71°C) or falls below this temperature, repeat steps a. and b. until correct engine tem- perature is maintained. e. Place transmission shift lever (6) in NEUTRAL and pull throttle control (3) to increase engine rpm to 2150 until normal operating temperature is achieved. f. Perform steps j. and k. of para. 2-12. 2-14. RAPID ENGINE WARM-UP (Contd) 1 2 3 4 5 6 7 8 9