TM 9-2320-209-10-1 c. Driver’s Compartment Controls and Indicators - Cont. 1. Cowl ventilator. When open, lets 3. FRONT TRANSMISSION gearshift air flow into the driver’s compart- lever. Used to place the trans- ment. mission in one of five forward 2. Air supply valve. Is an emergency positions, reverse or neutral. source of compressed air for 4. Spring tension control lever. inflating tires, cleaning air filters, Turned to make seat harder or etc. softer. 4-7