TM 9-2320-209-10-1 FRAME 10 1. CAUTION Do not use engine alone without help of service brake to slow down or stop truck. To do so would overspeed and cause damage to the engine. To downshift, when truck is unable to maintain speed or for going down a steep hill: (a) Let accelerator pedal (1) up and quickly step down on clutch pedal (2). (b) Let front transmission gears slow down. (c) Step down on accelerator pedal (1) to speed engine up slightly (1,400 rpm to 1,800 rpm) as shown on tachometer (3). (d) Move FRONT TRANSMISSION gearshift lever (4) to lower gear position. (e) Let clutch pedal (2) up slowly. NOTE To prevent overheating brakeshoe linings when going down a steep hill, press brake pedal (5) down, let it come up and press down again. If it becomes necessary to double clutch to shift gears, tell direct support maintenance unit. GO TO FRAME 11 4-53