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Air Compressor Governor
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPAIR - TM-5-4210-220-12_504
TM 5-4210-220-12 4-22.  AIR SYSTEM - Continued (5) Start the main engine and allow air tanks to fill.  Check pressure on primary and secondary air pressure gages in cab when governor cuts out. (6) Cut out pressure should be 105 - 115 psi (700 - 800 kPa). (7) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts in. (8) Cut-in pressure should be 90 - 100 psi (600 - 700 kPa). (9) If  pressure  settings  are  too  low,  remove  governor  cap,  loosen  the  locking  nut  and  turn  adjusting  screw counterclockwise.  If pressure is too high, turn screw clockwise. NOTE Be  careful  not  to  over  adjust.    Each  1/4  turn  of  the  adjusting  screw  raises  or  lowers  the  pressure setting approximately 4 psi (27 kPa). (10) When proper adjustment is obtained, tighten the adjusting screw locknut and replace the cover. (11) With the air pressure less than cut-out pressure, brush soap solution around the cover and exhaust port. Slight leakage is permitted.  Excessive leakage indicates a faulty inlet valve or lower piston O-ring. (12) With  the  air  pressure  above  cut-out  pressure,  brush  soap  solution  around  the  cover  and  exhaust  port. Slight leakage is permitted.  Excessive leakage indicates a faulty exhaust valve seal, exhaust stem O-ring, or O-ring at the top of the piston. (13) Leakage on all pipe fittings should be zero.  Tighten and/or remake connections as required. 4-377

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