Section XXIV AUXILIARY AIR-POWERED SYSTEMS

TM-9-2320-273-20 Truck 6 Ton 6x6 M939 M939A1 and M939A2 (Diesel) Manual
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TM 9-2320-273-20 Section XXIV AUXILIARY AIR-POWERED SYSTEMS 2-71. INTRODUCTION. Air pressure from the compressed air system is used for the following: (Brakes are covered in section XXIII.) a. Transmission and Controls (para 2-12). b. Power Transfer Case (para 2-14). c. Pusher Axle (para 2-16). d. Windshield Wipers (para 2-72). e. Air Horn (para 2-73). f. Fan Clutch Control (para 2-74). 2-72. WINDSHIELD WIPERS AND WASHERS. 1. WIPER CONTROL KNOB. In OFF position, knob directs air from supply line to park line. When pulled out, it diverts air to wiper line. By turning clockwise (LOW) or counterclockwise (HIGH), desired speed is selected. Return to center and push in to park wipers. 2. WASHER BUTTON. When button is pushed, air flows from manifold to reservoir. 3. WlPER KNOB SUPPLY LINE. Carries air for wiper system from manifold to control knob. 4. WASHER AlR SUPPLY LINE. Carries air from manifold to control button. 5. COMPRESSED AIR SUPPLY MANIFOLD. Supplies compressed air to washer and wiper through supply lines. 6. WIPER ARM. Connect wiper blade to linkage blade. Moved by motor. 7. WIPER BLADE. Replaceable blade wipes windshield. 8. RESERVOIR FILLER CAP. Filter underneath cap prevents dirt from entering system. Cap closes firmly to maintain pressure in system. 9. WASHER FLUID RESERVOIR. Holds supply of washer fluid. 10. RESERVOIR AlR LINE. Carries pressurized air from button to reservoir where pressure forces fluid into washer hose, 11. WASHER FLUID HOSE. Carries washer fluid from reservoir onto windshield 12. PARK AlR LINE. When knob is pushed into PARK position, air flows through park line to motor causing wiper blades to move down to REST position. 13. WIPER MOTOR. Air-powered motor turns wipers back and forth when air comes from wiper line or moves them down windshield to PARK position when air comes through park line. 14. WIPER AIR LINE. When knob is in WIPE position, air flows through wiper line to motor which starts wiper blades in motion. 15. WIPER LINKAGE. Linkage from motor actuates two wiper arms. 2-82

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