Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-3
Row Col Number Name
B 1 C00055 ANTI-ICE & RAIN WSHLD WIPER RIGHT
B 3 C00054 ANTI-ICE & RAIN WSHLD WIPER LEFT
(e) Stop the water spray.
SUBTASK 30-42-31-700-001
(3) Do these steps to measure the force of the wiper arm:
(a) Connect the spring scale, STD-759 at the point where the wiper blade attaches to the
wiper arm.
(b) Hold the scale perpendicular to the windshield.
CAUTION
DO NOT LIFT THE WIPER ARM MORE THAN NECESSARY TO LIFT THE
WIPER BLADE FROM THE WINDSHIELD. YOU CAN CAUSE DAMAGE
TO THE WIPER ARM AND MAKE IT UNSERVICEABLE.
(c) Pull the scale slowly until the wiper blade lifts off the windshield to measure the force.
NOTE: One end of the wiper blade may remain on the windshield during this test. A
piece of paper should be able to slide under the blade without binding.
ILF 301, 304, 308, 310, 314, 315, 317, 406, 409, 410, 412, 424, 425, 427-429, 451, 501-504, 507,
512-516, 519, 524 PRE SB 737-30-1054
SUBTASK 30-42-31-820-003
(4) Adjust the force of the wiper arm.
(a) If the force is less than 3.5 lbf (15.6 N), tighten the screw [4] to increase the force of the
wiper arm.
(b) If the force is larger than 4.5 lbf (20.0 N), loosen the screw [4] to decrease the force of the
wiper arm.
NOTE: The wiper motor is to be tensioned to the specified tension above, to be in
compliance with AD 2003-20-13.
ILF 101, 151, 156-199, 318, 319, 323, 331-399, 401, 402, 405, 416, 452, 491-500, 508-510, 518, 520,
523, 525-528, 530-533, 535-537, 541, 542, 552-557, 559-564, 567-569, 571-577, 581, 583, 585,
588-590, 592-599, 601-603, 606, 607, 610-615, 620, 625-627, 671, 672, 686, 691-699, 703, 707-710,
803-813, 821, 822, 831-838, 841, 842, 851, 852, 854-858, 861-863, 871-874, 947, 948, 968-973,
980-999; ILF 301, 304, 308, 310, 314, 315, 317, 406, 409, 410, 412, 424, 425, 427-429, 451, 501-504,
507, 512-516, 519, 524 POST SB 737-30-1054
SUBTASK 30-42-31-820-006
(5) Adjust the force of the wiper arm.
NOTE: The wiper motor has a dimple at the end of the motor/converter shaft.
(a) If the force is less than 6.5 lbf (28.9 N), tighten the screw [4] to increase the force of the
wiper arm.
(b) If the force is larger than 7.5 lbf (33.4 N), loosen the screw [4] to decrease the force of the
wiper arm.
NOTE: The wiper motor is to be tensioned to the specified tension above, to be in compliance
with AD 2003-20-13.
ILF ALL
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-42-31
Page 214
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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