500 Main Gear Reaction Link Wear Limits
Feb 20/91 Figure 601 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-11-71 Page 601
Main Gear Reaction Link Wear Limits 500
32-11-71 Page 602 Figure 601 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/72
500 Main Gear Reaction Link Wear Limits
Oct 20/85 Figure 601 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-11-71 Page 603
MAIN GEAR DAMPER - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Ground Lock Assemblies (Ref 32-00-01)
B. Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
C. Primer - BMS 10-11, Type I (Ref 20-30-41)
2. Prepare to Remove Main Gear Damper
A. Check that all ground lock assemblies (Ref 32-00-01) are installed.
B. Depressurize hydraulic system A including hydraulic reservoir.
C. Disconnect hydraulic line from damper, plug line, and cap damper.
3. Remove Main Gear Damper
A. Remove bolt securing electrical harness support bracket (5, Fig. 401) to main gear damper (13). Observe washer and flanged bushing (4).
B. Remove checknut (6), lockbolt (9), and lock washer (7).
C. Disconnect hydraulic line guides (12) from damper and secure hydraulic lines clear of torsion link.
D. Unscrew apex nut (8). Remove thrust washer (10).
E. Jack main gear with axle jack to raise tires clear of ground (Ref Chapter 7, Jacking Airplane).
F. Spread ends of torsion links to allow for removal of damper bolts by applying torsional load to inner cylinder.
NOTE: Torsion links may be spread by applying a counterclockwise pull on a 2 X 4 inch wood beam placed between the shock strut and wheel (Ref 32-11-0, page 604).
G. Remove damper attachment bolts (3).
H. Pull out damper (13), raise upper torsion link, and remove apex thrust washer (11).
4. Install Main Gear Damper
A. Place apex thrust washer (11, Fig. 401) between torsion links. Install washer on end of lower torsion link (15) with concave side against link.
B. Check that damper (13) is filled with hydraulic fluid.
Sep 01/02 32-11-81 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(1)
Remove the bleed plugs (17), (18) and the filler and bleed valve (16) from the manifold (19).
(2)
Add fluid to the manifold (19) open ports (16), (17), and (18) until they are all full.
(3)
Install filler and bleed valve (16) and bleed plugs (17), (18) in the manifold (19) ports.
WARNING: DO NOT GET HYDRAULIC FLUID ON YOU. HYDRAULIC FLUID, BMS 3-11, CAN CAUSE INJURY TO PERSONS. IF YOU GET THE HYDRAULIC FLUID ON YOUR SKIN, FLUSH YOUR SKIN WITH WATER. IF YOU GET THE HYDRAULIC FLUID IN YOUR EYES, FLUSH YOUR EYES WITH WATER AND GET MEDICAL AID. IF YOU EAT OR DRINK THE HYDRAULIC FLUID, GET MEDICAL AID.
CAUTION: USE CLEAN HYDRAULIC FLUID AND CLEAN EQUIPMENT WHEN YOU FILL THE DAMPER. DIRT CAN CAUSE DAMAGE TO THE HYDRAULIC SYSTEM.
DO THIS PRE-FILL STEP. AIR CAN BE TRAPPED IN THE DAMPER IF IT IS NOT FULL OF HYDRAULIC FLUID. THE DAMPER WILL NOT WORK PROPERLY IF AIR IS TRAPPED IN IT.
C. Turn inner cylinder by applying forward and aft force to wheels to spread torsion links, line up ends of torsion links, and insert damper in upper torsion link (1) with shaft through apex thrust washer (11) and lower torsion link (15). Verify that apex thrust washer (11) is properly seated on shaft.
D. Install damper bracket (2).
(1)
Apply wet primer to all areas of holes in damper bracket (2) and matching threaded holes in main gear damper (13).
(2)
Install damper attachment bolts (3) into holes with wet primer. Tighten bolts finger-tight.
E. Lower main gear and remove axle jack.
F. Tighten all bolts. Lockwire all bolts together.
CAUTION: CARE MUST BE TAKEN NOT TO TRAP LOCKWIRE BETWEEN TORSION LINK AND APEX THRUST WASHER.
G. Place thrust washer (10) on damper shaft with concave side against torsion link. Verify key in washer engages slot in shaft and washer is properly seated against torsion link.
H. Screw apex nut (8) on damper shaft with hexagon side towards thrust washer.
I. Check damper piston head protrusion. If protrusion is not within limits, rotate lower torsion link as required to achieve correct dimension.
J. Tighten apex nut 200 to 300 pound-inches torque.
K. Loosen apex nut and place lockwasher (7) on damper shaft. Note key in washer engages slot in shaft.
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