F. Disconnect pressure gage line on lower end of accumulator.
G. Loosen bolts and release clamps. Remove accumulator from airplane.
H. Remove hydraulic union and O-ring from lower end of accumulator.
I. Remove reducer union and O-ring from upper end of accumulator.
4. Install Hydraulic Brake Accumulator
A. Install hydraulic union with new O-ring at lower end and reducer union with new O-ring at upper end of accumulator.
B. Before installation ensure accumulator piston is bottomed on the hydraulic side of accumulator.
C. Install accumulator inside clamps in left wheel well and align gage line and fittings.
D. Connect gage line to lower end and hydraulic line to upper end of accumulator.
(See figure 401.)
E. Precharge hydraulic accumulator according to instructions on aluminum foil marker near pressure gage in right wheel well. Tighten swivel hexagon nut. Replace cap on charging valve.
F. Pressurize hydraulic system A. (Refer to 29-11-0.) System A gage should read approximately 3000 psi.
NOTE: For installation of system B brake accumulator, pressurize hydraulic system B. Refer to 29-12-0.
G. Check hydraulic and gage line connections at accumulator for leaks.
H. Bleed main gear brakes and check for brake operation by observing friction pin movement in response to brake pedal movement. Refer to Hydraulic Brake System - Maintenance Practices for bleeding procedure.
WARNING: MAIN GEAR BRAKES MUST BE BLED ACCORDING TO THE BLEEDING PROCEDURE LISTED IN HYDRAULIC BRAKE SYSTEM - MAINTENANCE PRACTICES OR INOPERABLE BRAKES MAY OCCUR DUE TO IMPROPER BLEEDING.
I. Check system A hydraulic reservoir and service. Refer to Chapter 12, Hydraulic Servicing.
502
32-41-51 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/01
H28924
500 Brake Accumulator Installation
May 15/67 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-41-51 Page 403
MAIN GEAR BRAKE SWIVEL - REMOVAL/INSTALLATION
1. Remove Main Gear Brake Swivel
A. Check that landing gear ground downlocks are engaged.
B. Chock wheels and release parking brake.
C. Depressurize hydraulic system A and B (Ref 29-11-0 MP and 29-12-0 MP).
D. Disconnect and cap hydraulic lines connected to swivel.
E. Remove attach bolts from bracket cap (Fig. 401).
F. Remove bracket cap and swivel.
2. Install Main Gear Brake Swivel
A. Install swivel and align holes of bracket cap and bracket.
WARNING: MAKE SURE THAT THE SWIVEL JOINT AND HYDRAULIC LINES ARE ORIENTED AS SHOWN IN FIG. 401, DETAIL A. THE HYDRAULIC LINE TO THE BRAKE ASSEMBLY MUST BE CONNECTED TO THE SWIVEL HOUSING AND THE HYDRAULIC LINE FROM THE ANTI-SKID VALVE TO THE SWIVEL FITTING AS SHOWN IN FIGURE 401, DETAIL B.IF THE ASSEMBLY OF THE SWIVEL AND THE HYDRAULIC LINES ARE ROTATED 180 DEGREES, THE HYDRAULIC LINES CAN BE CONNECTED BUT THE SWIVEL WILL NOT OPERATE. THIS CAN CAUSE THE HYDRAULIC LINES TO BREAK DURING EXTENSION AND RETRACTION AND CAUSE THE BRAKES PRESSURE TO BE LOST.
B. Attach bolts to bracket cap (Fig. 401).
C. Remove caps and connect hydraulic lines to swivel.
D. Pressurize hydraulic system A and B (Ref 29-11-0 and 29-12-0).
E. Check for leaks.
F. Bleed main gear brakes and check for brake operation by observing friction pin movement in response to brake pedal movement. Refer to Hydraulic Brake System - Maintenance Practices for bleeding procedure.
WARNING: MAIN GEAR BRAKES MUST BE BLED ACCORDING TO THE BLEEDING PROCEDURE LISTED IN HYDRAULIC BRAKE SYSTEM - MAINTENANCE PRACTICES OR INOPERABLE BRAKES MAY OCCUR DUE TO IMPROPER BLEEDING.
G. Service hydraulic reservoir (Ref Chapter 12, Hydraulic Servicing).
H. Depress pilots' brake pedals and set parking brakes.
May 01/98 32-41-61 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Main Gear Brake Swivel Installation 500
32-41-61Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
HYDRAULIC BRAKE CONTROL CABLES - REMOVAL/INSTALLATION
1. General
A. For cable length and fittings, see chart on figure 401. For general cable installation information, refer to Control Cables, Chapter 20.
2. Equipment and Materials
A. Tensiometer
B. Gear Ground Lock Assembly (Ref 32-00-01)
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