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TROUBLE SHOOTING (ELECTRIC)
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SPECIFICATIONS - TM-5-4210-230-14P-1_367
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS CHAPTER II WINDSHIELD WIPER (AIR) Fig. 1 Air Windshield Wiper Components DESCRIPTION Where  air  brake  equipment  is  specified  for  S-Series Trucks,   an   air   operated   windshield   wiper   is   also   available optionally.    This  air  wiper  system  (Fig.  1)  consists  of  an  air operated  wiper  motor,  an  instrument  panel  mounted  control valve  and  the  same  wiper  linkage  as  used  for  the  standard windshield wiper system. OPERATION The    air    wipers    operate    in    a    similar    manner    to conventional wipers so long as air pressure is supplied to the air wiper system.  However, to start wipers, control knob must be pulled out. Wiper speed is then controlled by turning knob clockwise  or  counterclockwise.    Push  knob  in  to  stop  wiper motor.      Reciprocating   action   of   wiper   arms   results   from reciprocating action of drive lever on air wiper motor. REMOVAL Linkage Air  wiper  linkage  removal  procedure  is  the  same  as required for the standard electric wiper as covered in Chapter I. Air Motor 1. Disconnect air lines from fittings on air motor. 2. If wiper linkage has not previously been disconnected from    air    motor,    reach    into    cowl    fresh    air    intake chamber and unfasten clip from air motor drive lever. 3. Remove   wiper   motor   bracket   mounting   screws   and detach air motor assembly from cowl. Control Valve 1. Remove  control  valve  knob  from  valve  on  instrument panel.  A small hex key wrench can be used to loosen knob set screws. 2. Remove mounting screws and detach panel to right of control valve. 3. Remove   mounting   nut   from   valve   shaft   and   detach wiper control valve from instrument panel. 4. Disconnect   air   hose   from   control   valve   and   remove control valve unit. INSTALLATION Air wiper components are installed in the reverse order of   disassembly   procedure.      When   returning   wiper   arms   to serrated  ends  of  drive  shafts,  the  following  steps  should  be observed    to    assure    correct    wiper    blade    positioning    on windshield. 1. With vehicle air pressure at 620 kPa (90 psi) note that wiper motor moves wiper blade to "Park" position when control knob is pushed in.  Wiper blades should be 25 mm (approx. 1 inch) up from bottom of windshield. 2. If  adjustment  is  necessary,  remove  wiper  serrated  nut from wiper arm and reposition arm and nut to specified wiper   position.   Adjust   each   wiper   arm   individually. Moving     arm     or     nut     one     serration     is     equal     to approximately five (5) degrees blade travel. CTS-2732  Page 1 PRINTED IN UNITED STATES OF AMERICA

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