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C.  Disconnect and plug hydraulic lines (Fig. 401).
D.  Remove bolts and washers securing package to structure. Remove package from airplane. Note spacer on lower bolt.
E.  Remove hydraulic unions from package and discard O-ring packings. Plug ports.
3.  Install Main Gear Modular Package
A.  Install hydraulic unions in package with new O-ring packings.
B.  Fill package with hydraulic fluid and cap ports.
C.  Place modular package in position with two hydraulic fittings up (Fig. 401).
D.  Install a washer on each mounting bolt. Insert bolts through package, add spacer to lower bolt, and screw bolts into bracket.
E.  Tighten bolts to standard torque.
F.  Remove caps and plugs. Connect hydraulic lines to package.
G.  Jack airplane for retraction of main gear only (Ref Chapter 7, Jacking Airplane).
H.  Remove ground lock assemblies and perform an operation test of main gear only (Ref 32-32-0, Adjustment/Test). Cycle gear retraction several times to bleed air from package and lines.
WARNING:  CLEAR ALL WHEEL WELL AREAS OF EQUIPMENT AND PERSONNEL BEFORE OPERATING GEAR.
May 15/80 32-32-61 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

I. Check package hydraulic connections for leaks.
J. Extend gear and install ground assemblies (Ref 32-00-01).
K. Lower airplane and remove jacks.

Main Gear Modular Package Installation  500 
32-32-61  Figure 401  May 15/80 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN GEAR TRANSFER CYLINDER - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Ground Lock Assembly - F72735 (Ref 32-00-01)
2.  Remove Main Gear Transfer Cylinder
A.  Check that landing gear ground lock assemblies are installed in all gear (Ref 32-00-01).
B.  Depressurize hydraulic system A (Ref Chapter 29).
C.  Disconnect and plug hydraulic lines attached to cylinder (Fig. 401).
D.  Loosen clamp bolts until transfer cylinder can be removed. Remove cylinder from airplane.
E.  Remove hydraulic unions and discard O-ring packings. Plug ports.
3.  Install Main Gear Transfer Cylinder
A.  Remove plugs and install hydraulic unions in transfer cylinder with new O-ring packings.
B.  Fill transfer cylinder from both ends with BMS 3-11 hydraulic fluid. Cap unions.
C.  Position transfer cylinder in clamps. Adjust position of cylinder until hydraulic lines are aligned (Fig. 401).
NOTE: If clamp tee bolts have been removed, the inboard tee bolt must be installed nut up.
D.  Remove caps, plugs and connect hydraulic lines finger-tight.
E.  Tighten clamp bolts and then hydraulic connections.
F.  Jack airplane for gear retraction (Ref Chapter 7, Airplane Jacking).
G.  Pressurize hydraulic system A (Ref 29-11-0, Maintenance Practices).
H.  Tape forward outboard section of wheel well seal in deflated position (if installed).
I.  Remove main gear ground lock assemblies (Ref 32-00-01) and cycle gear retraction several times to bleed air from cylinder and lines.
WARNING:  CLEAR ALL WHEEL WELL AREAS OF EQUIPMENT AND PERSONNEL BEFORE OPERATING GEAR.
May 15/80 32-32-71 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

J. Extend gear and install ground lock assemblies (Ref 32-00-01).
K. Check hydraulic connections for leaks.
L. Lower airplane and remove jacks.

Main Gear Transfer Cylinder Installation  500 
32-32-71  Figure 401  May 15/80 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN GEAR DOWNLOCK SPRING ASSEMBLY -REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Ground Lock Assembly -F72735 (Ref 32-00-01)
B.  Spring Expander Set -F80169-1
C.  Grease -MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
2.  Remove Main Gear Downlock Springs
A.  Check that landing gear ground lock assemblies are installed (Ref 32-00-01).
B.  Depressurize hydraulic system A.
C.  Remove cotter pins, nuts, and washers from aft downlock spring attachment (Fig. 401).
D.  Install spring expander on aft downlock spring and relieve spring tension.
E.  Disconnect inboard end of aft downlock spring and remove spring and spacer from airplane.
F.  Install spring expander on forward downlock spring and relieve spring tension.
G.  Disconnect outboard end of forward downlock spring.
H.  Remove inboard attachment bolt, forward spring, and spacer.
　
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