SERVICE MANUAL Fig. 7.  Exploded View of Cam Actuated Parking Type Motor (American Bosch) KEY DESCRIPTION 1 Link, pivot arm shaft 2 Bracket, motor mtg. 3 Housing, drive end 4 Screw, set, armature 5 Shaft, drive 6 Washer, spacing 7 Plate, drive 8 Cam, parking 9 Plate, contact 10 Gasket, cover 11 Cover, drive end 12 Housing, wiper motor 13 Bolt, thru 14 Spring, brush 15 Brush, wiper motor 16 Frame, commutator end DESCRIPTION AND OPERATION The windshield wiper circuit is composed of the battery, a fractional   horsepower   motor,   a   three-position    control switch  (off,  slow  speed  and  high  speed)   with   thermal overload protection. The    wiper    motor    incorporates    self-aligning    armature shaft  bushings  and  has  automatic  parking  of  the  wiper blades. KEY DESCRIPTION 17 Washer, thrust 18 Armature 19 Knob, wiper switch 20 Nut, switch mounting 21 Escutcheon, control knob 22 Switch, wiper motor 23 Shaft, pivot arm 24 Washer, flat 25 Clip, spring 26 Blade, wiper 27 Arm, wiper blade 28 Nut, pivot arm shaft 29 Spacer, pivot arm shaft 30 Gasket, spacer 31 Link, pivot arm shaft When the control switch is turned to the slow speed, the resistor  is  shorted  out  and  the  motor  receives  the  full shunt field.  When turned to the high speed position, the resistor is inserted in the shunt field circuit. The armature shaft has a worm gear on the end opposite the  commutator  which  drives  a  fiber  gear  mounted  on the   crank   arm   shaft.      This   provides   the   reciprocating action to the wiper arms and blades. PRINTED IN UNITED STATES OF AMERICA CTS-4056-Chapter II Page 2