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Setting Procedure
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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DECELERATION THROTTLE MODULATOR (DTM) SYSTEM
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 To compensate for fuel and temperature variations when setting idle mixture, observe these precautions: a. Do  not  idle  engine  continuously  for  more  than  three minutes at one time. b. After  each  three  minutes  of  idling,  increase  engine speed to 2000 rpm for one minute. c. Continue with idle adjustment procedure.  Do not idle engine for more than three minutes without repeating Step b. Adjustment Procedure: a. Connect  tachometer  to  engine.  (Tachometer  should have an expanded scale of 400 to 800 or 0 to 1000 rpm and 1 to 2% accuracy. b. Remove limiter cap(s).  To prevent damage to screw threads or seat, file or grind away the side of the cap. Do not pry cap off. c. Operate     engine     until     it     reaches     normal     operating temperature. d. Gently  seat  idle  mixture  screws  (not  required  on  4- 196 engine). e. Carefully,  adjust  idle  mixture  screws  (equal  number of turns) to produce maximum idle speed. f. Observe  tachometer  and  adjust  curb  idle  screw  to obtain the following required engine speed. Required engine speed is the total of the midrange of Curb Idle Speed (see Emission Control Tune-Up Specifications) and Speed Drop RPM (see Emission Control Tune-Up Specifications) added together. g. Adjust  curb  idle  mixture  screw(s)  (equal  number  of turns)     in     until     mid-point     of     idle     speed     range specification    is    obtained    (see    Emission    Control System Tune-Up Specifications). h. Install new plastic (service) limiter cap(s) with tab in mid-position. CGES-215  Page 34 PRINTED IN UNITED STATES OF AMERICA

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