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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SEE A
WIPER
OFF PARK LOW
HIGH
SEE C
STA
OVERHEAD PANEL
259.8
SEEB  A
STA
STA 178
188
WIPER BLADE
RESISTOR BOX
B
WIPER ARM
MOTOR-CONVERTER
C
ASSEMBLY
Windshield Wiper System Component Location
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 3.
4.

5.

6.

A
737-300/400/500MAINTENANCE MANUAL
 C.  The converter has a serrated drive shaft which protrudes through the skin just forward of the windshield for attachment of the wiper assembly. The converter changes the high speed low torque rotary motion of the motor to a low speed high torque circular oscillating motion for the wiper arm by the use of a worm gear and eccentric drive mechanism. The motor and converter are synchronized with respect to the wiper cycle before the units are coupled together.
Control Switch
______________
 A.  Control Switch
 (1)  The windshield wiper control switch is a four-position switch. The switch is located on the overhead panel and is used to control the action of both windshield wiper motors by changing the motor circuitry.
 (a) The switch has a momentary PARK position and three detent
 positions, OFF, LOW, and HIGH.Resistor Box
____________
 A.  Each windshield wiper system has a resistor box for the motor (Fig. 1). The box contains three resistors which may be selected by the control switch to be added in series with the motor circuit to control the motor speed.
Wiper Assembly
______________
 A.  The windshield wiper assembly consists of a wiper blade and wiper arm. The wiper arm has a serrated sleeve at the hub to provide angular adjustment between the arm and the converter drive shaft and is attached to the shaft by a bolt through the hub. The wiper tension of the arm can be adjusted by a tension adjusting nut near the hub of the arm. The wiper blade is bolted to the end of the wiper arm and the angle between the blade and the arm can be adjusted by means of a serrated disc attached to each part.
Operation
_________
 A.  The operation of both windshield wiper systems is controlled by turning the windshield wiper control switch located on the overhead panel to the rate of wiper action desired. When switch position LOW or HIGH is selected, power will be directed from the respective system bus through the control switch to the motor, back through the control switch for resistance or speed selection, then to selected resistance to ground (Fig. 2). The amount of resistance selected determines the motor speed and therefore the rate of wiper action.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OFF
LOW

M23 HIGH PARK
M24 RIGHT RESISTORBOX (STA 180,RBL 30, WL 185)
THERMAL OVERHEATOFF
PROTECTOR SWITCH300 F`
LOW PARK
HIGH
BUS 1

28V DC S22 C55
M
WIPERS
RIGHT

CALL
RAIN REPEL M22 R WINDSHIELD
WIPER MOTOR
(STA 188)LRSILL BEAM
WIPER
OFF
PARK

LOWHIGH
THERMAL OVERHEATPROTECTOR SWITCHOFF 300 F`
LOW PARK
28V DC
HIGH
BUS 2

C54
WIPERS

M
LEFT OFF
P18-3 CIRCUIT BREAKERPANEL LOW PARK HIGH
M21 L WINDSHIELDWIPER MOTOR(STA 188) S22 WINDSHIELD WIPER
M23 LEFT RESISTOR
CONTROL SWITCH (P5)

BOX (STA 180,
RBL 30, WL185)

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