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6.  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.
B.  When the control switch is turned to the PARK position and the wiper is in any position other than PARK, the switch completes a circuit through the PARK contacts of the control switch and through the N O contacts of the cam operated switch in the motor to ground. This will shunt the resistor box out of the control circuit and drive the motor at high speed until the motor reaches the PARK position of the wiper cycle and the switch cam moves the switch to close the N C contacts of the cam operated switch. With the cam operated switch in the N C position the motor armature is shunted out by the cam operated switch and the circuit is completed to ground through the PARK contact of the control switch and the full resistor load. With the motor field coil still energized and the motor armature shorted by the cam operated switch, dynamic braking is provided to stop the motor from coasting. This stops the motor with the wiper blades in the PARK position.
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F88344 F91195 F91810
526  Windshield Wipers Circuit 
Aug 15/69  Figure 2  30-42-0 
Page 5 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

526 
Feb 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  30-42-0 Page 101 

 

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WINDSHIELD WIPER SYSTEM - ADJUSTMENT/TEST
1. Windshield Wiper System Test
A.  Connect external electrical power and check that the WINDSHIELD WIPER R and L circuit breakers on P18 panel are closed.
B.  Simulating rain with a water spray, turn windshield wiper switch successively to each speed, and check wiper operation for satisfactory rain removal through each wiping speed. Check that wipers operate smoothly without excessive noise, and that wiped area does not overlap onto structure.
CAUTION: DO NOT OPERATE WINDSHIELD WIPERS ON DRY WINDSHIELDS.
NOTE:  Wipers should make a minimum of 250 strokes per minute with windshield wiper switch in HIGH position, and a minimum attainable speed commensurate with stable motor operation with switch in LOW position.
C.  Turn switch to PARK position and check that wipers park in proper position.
D.  Determine whether there is any further need for electrical power on the airplane, if not, remove external power.
526 
Jun 20/86  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  30-42-0 Page 501 

WINDSHIELD WIPER ASSEMBLY - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Grease - MIL-G-23827 (Ref 20-30-21)
B.  Tension Spring Scale - 0-20 pounds
2.  Remove Windshield Wiper Assembly
A.  Open WIPERS-LEFT or WIPERS-RIGHT circuit breaker on P18 panel.
B.  Loosen adjusting nut on wiper arm.
C.  Remove nut securing wiper blade to wiper arm and remove wiper blade.
CAUTION: DO NOT ALLOW ARM TO SLAP WINDSHIELD.
D.  Loosen wiper arm pinch screw securing serrated adjustment sleeve.
E.  Remove bolt securing arm to converter shaft and remove wiper arm.
3.  Install Windshield Wiper Assembly
A.  Attach wiper blade to wiper arm and secure blade with nut. Set wiper blade at proper angle with wiper arm (Fig. 401).
B.  Close appropriate WIPERS circuit breaker on P18 panel.
C.  Check that motor and converter are synchronized by noting that motor stops in PARK position with converter output shaft at limit of rotation in direction of park stroke.
D.  Apply grease to serrations on wiper arm adjustment sleeve and converter shaft. Ensure that sleeve is installed with slot in sleeve in line with slot in arm hub.
E.  Install wiper arm in PARK position by locating arm on converter shaft so that when a 2 to 3 pound force is applied to blade attach point, blade will lie adjacent to window sealant along sill beam (Fig. 401). On windows with Z-channel strip, position wiper blade per Fig. 401. If correct blade position cannot be obtained, relocate arm as follows:
　
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