Fig. 8. Electric Windshield Wiper Motor (External View)

Fig. 7. Exploded View of Cam Actuated Parking Type Motor (American Bosch)

CLEANING, INSPECTION AND REPAIR - TM-5-3820-256-24-5_652

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL Fig. 8. Electric Windshield Wiper Motor (External View) CAUTION: DO NOT attempt to move the wiper blades through their sweep by grasping the wiper arm. This action may result in the teeth being broken off the drive gear or the linkage bent. If blades are frozen to wind- shield, do not operate control switch until they have been freed. DISASSEMBLY To facilitate reassembly of the wiper, it is suggested that parts be laid on a clean bench in the order in. which they are removed. All key numbers used in "Disassembly" and "Reassembly" procedures refer to Fig. 7. Disconnect linkage from wiper motor and remove bolts holding mounting bracket to cowl. Remove wires from control switch and lift out motor assembly. Remove bolts holding mounting bracket to drive end housing (3). Remove drive end cover (11). Take out parking switch contact plate (9) from drive end housing (3). See Fig. 9.If parking switch assembly is to be replaced, unsolder the field coil leads from the switch terminals. It is important that you note to which terminal each Lead is connected. Remove drive gear shaft nut and washer. Take crank arm off of drive shaft. When removing nut from drive shaft, crank arm must be supported to prevent stripping of the gear teeth. This may be done by inserting crank arm in a vise or grasping it with pliers. Remove drive gear and shaft assembly (5). Take parking cam (8) and spring washer from gear and shaft assembly (5), if necessary. Take notice of the direction in which the dotted end of the cam faces (Fig. 9). Fig. 9. Removing Drive Housing Cover Plate and Switch Contact Plate 1. Reassembly Matching Mark Remove the two thru bolts holding the drive end housing (3) and commutator end frame (16) to the wiper motor housing (12). See Fig. 10. Separate the commutator end frame (16) from the motor housing (12). Carefully lift the brushes (15) clear of the armature commutator and hold them in this position until the commutator end frame (16) is removed from the armature shaft (18). A tool for holding the brushes in the holders may be made from .040"-.050" diameter piano wire approximately 10" long. Form each end of the wire into a U-shaped hook. By inserting the hooks under the brush shunts, the brushes will be forced back into the holders. If a field coil lead is soldered to a terminal on the insulated brush holder, it will be necessary to unsolder this lead to replace the commutator end frame (16). Fig. 10. Motor Housing and Related Parts CTS-4056-Chapter II PRINTED IN UNITED STATES OF AMERICA Page 3

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