501 Brake Metering Valve Installation
Sep 20/82 Figure 401 (Sheet 2) 32-41-31
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Disconnect hydraulic lines from metering valve and brake valve feel augmentation actuator. Cap valve ports, actuator ports, and hydraulic lines.
D. Remove check valve from brake metering valve return port No. 3. Cap valve port.
E. Remove three sets of attaching bolts, nuts, and washers and detach brake metering valve from brake metering valve control quadrant housing assembly.
F. Remove brake metering valve and brake valve feel augmentation actuator.
G. Remove brake valve feel augmentation actuator assembly from brake metering valve by removing two sets of attaching bolts, nuts, and washers plus a single bolt and washer.
5. Install Brake Metering Valve
A. Apply corrosion preventive compound to mating spline surfaces of brake metering valve assembly shaft and feel augmentation actuator assembly crank.
B. Stack brake metering valve and feel augmentation actuator assemblies together with splines of shaft and crank engaged. Ensure that brake metering valve is on top and that metering valve port No. 2 and 3 and feel augmentation port No. 1, 2, and 3 will all point outboard with metering valve port No. 1 and 4 pointing to the rear when assemblies are installed in airplane.
C. Align matching bolt holes and secure brake metering valve assembly to feel augmentation actuator assembly using two sets of bolts, washers, and nuts plus a single bolt and washer. (See figure 401.)
D. Lubricate new O-ring with hydraulic fluid and install check valve in brake metering valve system B return (No. 3) port with check valve arrow pointing away from brake metering valve.
E. Lubricate new O-rings with hydraulic fluid and install unions in remaining ports of brake metering valve and feel augmentation actuator.
F. Apply corrosion preventive compound to mating spline surfaces, align splines, and engage shaft ends of brake metering valve and control quadrant housing assembly installed on airplane.
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May 15/71
G. Align matching bolt holes and secure brake metering valve assembly to control quadrant-housing assembly using three bolts, installed head down, with washers and nuts.
H. Connect all hydraulic lines.
I. Install guard on brake metering valve and brake valve feel augmentation actuator assembly by attaching guard with four rods using bolt, nut, and washer.
J. Test hydraulic brake system. Refer to 32-41-0, Hydraulic Brake System -Adjustment/Test.
K. Bleed main gear brakes and check for brake operation by observing friction pin movement in response to brake pedal movement. Refer to 32-41-0, 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.
6. Restore Airplane to Normal Configuration
A. Service hydraulic reservoir. Refer to Chapter 12, Hydraulic Servicing.
B. Set parking brakes. After 5 or 10 minutes, check hydraulic line connections for leaks.
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32-41-31 Page 405
MAIN GEAR WHEEL BRAKE - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Wheel Change Dolly - Commercially available
B. Axle Protection Sleeve - F80007-1 or F72913-8
C. Torque wrench - required for 150 to 350 pound-feet torque
D. Gear Ground Lock Assembly (Ref 32-00-01)
E. Grease (Ref 20-30-21)
(1)
Aeroshell #5 (preferred)
(2)
MIL-G-81322 (first alternate)
(3)
MIL-G-25760 (second alternate)
F. Thread Lubricant
(1) Ease-Off 990 or equivalent
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