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B.  Hydraulic Fluid, Fire Resistant -BMS 3-11
C.  Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
2.  Remove Main Gear Uplock Actuator
A.  Check that landing gear ground lock assemblies are installed (Ref 32-00-01).
B.  Depressurize hydraulic system A (Ref 29-11-0 MP).
C.  Tag hydraulic lines to show position and disconnect from uplock actuator. Plug hydraulic lines.
D.  Remove nuts washers and bearings from inboard actuator attachment.
E.  Remove shaft.
F.  Remove attachment bolt from outboard end of actuator and remove actuator from airplane.
G.  Remove hydraulic fittings from actuator. Discard O-ring packings and plug ports.
3.  Install Main Gear Uplock Actuator
A.  Install hydraulic fittings and O-ring packings lubricated with hydraulic fluid, in actuator.
B.  Retract actuator. Fill actuator with hydraulic fluid and cap ports.
C.  Place uplock actuator in position with piston end inboard and ports facing forward (Fig. 401).
D.  Install outboard attachment bolt, washer, and nut. Lightly lubricate bolt shank with grease prior to installation.
E.  Install inboard attachment shaft.
F.  Tighten outboard attachment nut 75 to 100 pound-inches. If cotter pin cannot be installed within specified torque limits, compliance with torque requirements shall be obtained by interchanging nuts or by adding one washer or both.
G.  Install bearings, washers, and nuts on shaft. Tighten nut 50 to 70 pound-inches lube torque.
H.  Install cotter pins in uplock attachment nuts.
I.  Remove plugs and caps and connect hydraulic lines to actuator.
J.  Perform retraction test of main landing gear only (Ref 32-32-0, A/T).
K.  Cycle gear several times to bleed air from actuator lines.
L.  Check hydraulic connections for leaks.
May 01/03 32-32-41 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

G42574
Main Gear Uplock Actuator Installation  500 
32-32-41  Figure 401  Feb 20/91 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN GEAR DOWNLOCK ACTUATOR - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Gear Ground Lock Assembly (Ref 32-00-01)
B.  Hydraulic Fluid, Fire Resistant -BMS 3-11
C.  Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
2.  Remove Main Gear Downlock Actuator
A.  Check that landing gear ground lock assemblies are installed (Ref 32-00-01).
B.  Depressurize hydraulic system (Ref 29-11-0 MP).
C.  Tag hydraulic lines to show position and disconnect from downlock actuator. Plug hydraulic lines (Fig. 401).
D.  Remove downlock springs (Ref 32-32-91 R/I).
E.  Remove outboard actuator attachment bolt and remove actuator from airplane.
F.  Remove hydraulic fittings from actuator. Discard O-ring packings and plug ports.
3.  Install Main Gear Downlock Actuator
A.  Install hydraulic fittings and O-ring packings lubricated with hydraulic fluid in actuator.
B.  Retract actuator. Fill actuator with hydraulic fluid and cap ports.
C.  Place downlock actuator in position with piston end inboard and ports facing forward (Fig. 401).
D.  Install outboard attachment bolt, washer, and nut. Lightly lubricate bolt shank with grease prior to installation.
E.  Install downlock springs (Ref 32-32-91 R/I).
F.  Tighten outboard attachment nut 75 to 110 pound-inches. If cotter pin cannot be installed within specified torque limits, compliance with torque requirements shall be obtained by interchanging nuts or by adding one washer or both.
G.  Remove plugs and caps and connect hydraulic lines to actuator.
H.  Perform retraction test of the main landing gear only (Ref 32-32-0 A/T).
I.  Cycle gear several times to bleed air from actuator.
J.  Check hydraulic connections for leaks.
May 01/03 32-32-51 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Main Gear Downlock Actuator Installation  500 
32-32-51Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/91 

MAIN GEAR MODULAR PACKAGE - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Ground Lock Assembly - F72735 (Ref 32-00-01)
B.  Hydraulic Fluid, Fire Resistant - BMS 3-11
2.  Remove Main Gear Modular Package
A.  Check that landing gear ground lock assemblies are installed in all gear (Ref 32-20-01).
B.  Depressurize hydraulic system A (Ref Chapter 29).
　
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