Servicing Electric Windshield Wiper

The Windshield wiper is operated by electric current taken from the storage battery. The wiper, being independent of the engine, operates with equal efficiency during acceleration and hill climbing. It will also operate with the engine stopped.

The wiper is placed in operation by moving the small switch panel to the right. Should the wiper fail to start the blade maybe stock or frozen to the windshield glass. To dislodge it, move the large handle. This handle can also be used if it is desired to wipe the windshield by hand.

The wiper blade is driven by an automatic disengaging clutch contained within the wiper. This clutch can be released by a quick movement of the handle to bring the blade towards the bottom of the windshield. The windshield can then be wiped by hand, but the clutch will engage each time the blade is returned to its former position.

operation of the blade

The proper wiping operation of the blade depends on the condition of the edge of the blade and also the tension adjustment. The edge of the blade should be smooth, straight and free from oil.

The tension should be heavy enough to prevent chatter but not sufficiently heavy to bend the rubber against the glass. The tension is adjusted by the small knurled nut where the spring arm connects to the driving lever.

Circular streaks on the glass are caused by (a) frayed edge on rubber, (b) irregular edge on rubber, (c) bent blade, (d) oil or grease on windshield or rubber.

The blade should return readily admit at each end of the stroke. If blade fails to turn it will chatter on glass. If blade chatters on one side only, it indicates that blade is turning too far in spring arm. The opening in the lower end of spring arm should be 5/32″ (See Fig. 504) Blade should turn an equal amount at each end of stroke. Too great a tension will prevent blade from turning.

To check trouble

When the switch is turned on the ammeter should show a small discharge. If the wiper does not start and the ammeters fails to show a discharge it indicates an open circuit in the wiper line. To check this, swing the windshield to its outer position and examine the connector on the end of the wire leading to the windshield wiper. This connector should snap firmly over the post on the wiper. If the wiper now fails to operate, test this line to determine if it is alive. If it is alive test the ground connection on the wiper by holding a piece of bare wire against either one of the two nickel-plated screws on top of the cover and the other end of the wire against an exposed metal part on the windshield frame. When making this test be sure the wiper switch is in the “on” position. If the wiper now operates it indicates a faulty ground connection and it will be necessary to remove the wiper and clean the windshield frame under the ground connection. If the wiper still fails to operate, install a new wiper.

Wipers are guaranteed for four months. Should a wiper fail within that period, a new wiper should be installed without charge. Beyond the four months period owner should pay for new wiper. Dealers should not attempt to repair internal; mechanism of wiper.

To remove wiper from car

Swing windshield open and remove the nut and lock washer on the switch handle (See A, Fig. 504). The handle can then be removed by pulling it straight off. next loosen the set screw B in wiper handle and withdraw handle from shaft. Disconnect windshield wiper wire C from wiper and remove the two screws D attaching wiper feet to windshield. Wiper can now be removed.

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