30-42-01
 ALL  ú ú 01 Page 404 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 WINDSHIELD WIPER ARM - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This subject contains two tasks, one for removal and one for installation of the windshield wiper arm. The procedure has these parts:
 (1)  
Put a pad between the wiper arm and the windshield.

 (2)  
Removal of the the wiper arm.

 (3)  
Installation of the replacement arm.

 (4)  
Test of wiper operation (with water to protect windshield).

 (5)  
Adjustment of wiper arm if necessary.

 B.  The windshield wiper arm is attached to the motor-converter shaft through an adjustment bushing.
 TASK 30-42-02-004-001
 2.  Windshield Wiper Arm Removal (Fig. 401).____________________________
 A.  Standard Tools and Equipment
 (1)  Sealant cutting tool - hardwood or plexiglass
 B.  Consumable Materials
 (1) G00507, Cloth - Lint Free (to protect windshield from wiper arm)
 C.  References
 (1)  
AIPC 30-42-01, Fig. 1

 (2)  
SSM 30-42-01

 (3)  
WDM 30-42-11

 D.  Access
 (1)  Location Zone 221 Control Cabin, LH - Outside No. 1 Left Window 222 Control Cabin, RH - Outside No. 1 Right Window
 E.  Prepare for Removal
 S 284-002
 (1)  Make sure that the wipers are in the parked position off the windshield.
 S 864-003
 WARNING:_______MAKE SURE TO OPEN THE CIRCUIT BREAKERS BELOW. IF YOU DO NOT OPEN THESE CIRCUIT BREAKERS, YOU CAN GET A DANGEROUS ELECTRICAL SHOCK WHEN YOU TOUCH THE WINDSHIELD.
 (2)  Open these circuit breakers:
 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E1, WSHLD WIPER L
 2) 7E25, WSHLD WIPER R

 (b)  
P6, Main Power Distribution Panel
 1) 6B34, WINDOW HEAT 1L PWR
 2) 6B17, WINDOW HEAT 1R PWR

 (c)  
P180, DC Power Distribution Panel
 1) 180H26, WDO HEAT CONT 1L

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 30-42-02
 ALL  ú ú 01 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

1. WIPER BLADE  2. SCREW 
3. WASHERS 
SEE  A 
AREA WIPED A  SEE  B  CSEE ARM UNDER RESTRAINER) (BLADE PARALLEL WITH 14. WIPER STOP PARKED POSITION RAMP  13. ROD  6. PRESSURE 5. WIPER ARM 4. BLADE PLATE SPOILER) (WITH RESTRAINER 
WASHER 
CONVERTER MOTOR  10. HUB 11. HUB CLAMP 12. ADJUSTMENT 9. WASHER BUSHING SCREW  7. PRESSURE 8. HOLDDOWN SCREW SCREWS PLATE 
B 
Figure 401 (Sheet 1) Wiper Arm Installation 

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 30-42-02
 ALL  ú ú 01 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
WIPER BLADE

C

LEVER
WIPER ARM UNLATCH LEVER MECHANISM - WIPING POSITION
POSITION OF LEVER FOR ADJUSTMENT

3. WASHER
15. UNLATCH LEVER
WIPER ARM UNLATCH LEVER MECHANISM - PARKED POSITION

Wiper Arm Installation
Figure 401 (Sheet 2)

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 30-42-02
 ALL  ú ú 01 Page 403 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

MOTOR/CONVERTER SHAFT
MOVE THE ADJUSTMENT BUSHING AND THE WIPER DO NOT LET THE MOTOR CONVERTER SHAFT MOVE. ARM HUB TOGETHER ONE TOOTH ON THE SHAFT. HUB ADJUSTMENT ADJUSTMENT BUSHING AND WIPER  OUTBOARD BLADE TIP APPROXIMATE MOVEMENT AT THE 4.76 INCHES 
　
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