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Oct 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-44-0 Page 103
BRAKE ACCUMULATOR SYSTEM - PARKING BRAKE RELEASED - TROUBLE SHOOTING PARKING BRAKE SYSTEM - ADJUSTMENT/TEST
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32-44-0 Page 104 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/92
1. Parking Brake System Adjustment
A. General
(1) The parking brake system is adjusted to hold brakes on with a set parking brake lever position. Adjustment may be necessary after pedal linkage is reset, or after replacements in parking brake linkage. Pressure setting is controlled by adjusting two pawls (Fig. 501). The handle is adjusted by adjusting pushrods, and by the setting of a bumper stop.
B. Equipment and Materials
(1)
On airplanes with rig pin hole in jackshaft, Rigging pin - 0.309/0.311 inch diameter by 6.8 inches long (one required)
NOTE: The rigging pin is part of kit F70207-61
(2)
Ground Lock Assembly (Ref 32-00-01)
C. Prepare to adjust parking brake system.
(1)
Check that all ground lock assemblies are installed (Ref 32-00-01).
(2)
Put chocks on the wheels and release the parking brake.
D. Adjust the Parking Brake Pawls
(1)
Remove the antirotation cotter pin in the two pawls.
(2)
Loosen the two pawl locknuts on top of the pawls.
(3)
Extend each pawl one at a time by unscrewing the pawl counterclockwise until the parking brake can no longer be set.
(4)
Complete the adjustment by turning the pawls back clockwise 1 to 2 turns.
(5)
Make sure that the parking brake can be set from the brake pedals of the pilot and the copilot.
(6)
Install the antirotation cotter pins in the two pawls.
(7)
Tighten the pawl locknuts.
E. Set the Bumper Stops for the Pawls
(1)
Add or remove washers to set the bumper stops.
(2)
With the parking brake released, the pick-up bolt on the brake control bellcrank should clear the pawl by 0.16 to 0.20 inch when you operate the brake pedals (Detail C, Fig. 501, Sheet 2).
F. Parking Brake Lever Pushrods Adjustment
(1)
On airplanes without the jackshaft rigging pin:
(a)
With the parking brake lever resting on the top of the control stand, adjust the upper pushrod to align the lower leg of the jackshift approximately 13 degrees from the vertical (Detail E, Fig. 501, Sheet 2).
(b)
Adjust the lower pushrod to allow the pawls to just contact the bumper stops (Fig. 501, Sheet 2).
(2)
On airplanes with the jackshaft rigging pin:
(a)
Install the jackshaft rigging pin (Fig. 501, Sheet 3).
(b)
If the rig pin cannot be installed, adjust the upper or the lower pushrods until the pin can be installed.
(c)
Adjust the upper pushrod until the parking brake lever just rests on the top of the control stand.
(d)
Adjust the lower pushrod to allow the pawls to just touch the bumper stops (Fig. 501, Sheet 2).
(e)
Remove the jackshaft-rigging pin.
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Oct 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-44-0 Page 501
Parking Brake Linkage Adjustment 515
32-44-0 Figure 501 (Sheet 1) Jun 20/85
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Parking Brake Linkage Adjustment
Oct 20/91 Figure 501 (Sheet 2) 32-44-0
Page 502A
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Parking Brake Linkage Adjustment 515
32-44-0 Figure 501 (Sheet 3) Oct 20/91
Page 502B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Parking Brake Switch Adjustment
(1)
Loosen the bolts on the switch-mounting bracket.
(2)
With the brake pedals released, pull the parking brake lever until it stops.
(3)
With the parking brake held in the up position, turn the switch until the switch actuating roller touches the rod end of the lower pushrod.
(4)
Tighten the switch mounting bolts.
2. Parking Brake System Test
A. Equipment and Materials
(1)
Pressure Gages - 0 to 3500 psi, for hydraulic fluid. 4 gages are necessary.
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