F. Remove actuator from assembly.
(1)
Remove actuator/walking beam attachment bolt (7) connecting actuator and walking beam to beam hanger (5).
NOTE: Observe flanged steel bushings (4) in beam hanger, nylon spacers between actuator and beam hanger, and special washer under nut.
(2)
Remove hydraulic fitting (17) and one way restrictor (18) from actuator and discard O-ring packings.
5. Prepare to Install Actuator Assembly
A. Install hydraulic fitting (17, Fig. 401) in up port and one way restrictor (18) in down port of actuator with new O-ring packings.
NOTE: Install restrictor with hex away from port.
B. Clean and lightly lubricate all attachment bolts, pins, and bearing surfaces with grease immediately before assembly.
WARNING: USE NITRILE GLOVES FOR SKIN PROTECTION AGAINST BMS 3-27 (MASTINOX 6856K). IF MASTINOX GETS ON YOUR SKIN, IMMEDIATELY REMOVE IT WITH WATER. IF THIS MATERIAL GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER AND GET MEDICAL AID. THIS MATERIAL CONTAINS VERY POISONOUS AND FLAMMABLE AGENTS WHICH CAN CAUSE INJURIES TO PERSONS.
CAUTION: UNWANTED MASTINOX MUST BE REMOVED FROM SURFACES WHICH WILL BE GREASED. APPLICATION OF MASTINOX TO JOINTS THAT TURN COULD CAUSE FAILURE OF THE LANDING GEAR TO EXTEND OR RETRACT.
NOTE: 1. Parts which are not lubricated after installation must be coated with Mastinox 6856K.
2. Parts which are lubricated after installation must be lubricated with Aero Shell 07.
C. Place main gear actuator (6) in beam hanger (5) with ports down.
CAUTION: BEAM HANGER SHAFT (8) IS NOT SYMMETRICAL. CHECK THAT SHORT FLAT SIDE OF LUG ON BEAM HANGER SHAFT (8) IS INSTALLED FACING DOWN. IF SHAFT IS NOT PROPERLY POSITIONED, DAMAGE TO AIRPLANE MAY OCCUR WHEN GEAR IS RETRACTED.
CAUTION: DO NOT LET BEAM HANGAR TOUCH ACTUATOR. DURING ASSEMBLY OF ACTUATOR ASSEMBLY, BEAM HANGAR CAN ROTATE ABOUT BOLT (7) AND TOUCH ACTUATOR. DAMAGE TO BEAM HANGAR CAN OCCUR IF BEAM HANGAR TOUCHES ACTUATOR.
D. Check that flanged steel bushings (4) are in position in beam hanger (5). Bushings must be installed with flanges on outer face of hanger.
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32-32-11 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/91
E. Position nylon spacer on each side of actuator over actuator bearing with chamfered face of spacer toward beam hanger.
F. Align walking beam over hanger, with cut-away cross rib nearest actuator (View 1).
NOTE: Long arm of hanger pivot must be forward when assembly is installed.
G. Insert actuator/walking beam attachment bolt (7) so that head will be aft when assembly is installed. Add special washer and nut.
CAUTION: MAKE SURE THE BOLT HEAD OF THE ACTUATOR/WALKING BEAM IS INSTALLED IN THE CORRECT ORIENTATION. INCORRECT INSTALLATION OF THE ACTUATOR/WALKING BEAM ATTACHMENT BOLT (7) CAN CAUSE DAMAGE TO THE WALKING BEAM.
H. Tighten nut 350-400 pound-inches lube torque. Lock nut with cotter pin.
6. Install Actuator Assembly
A. Raise assembly into position with beam hanger outboard.
CAUTION: DO NOT LET BEAM HANGAR TOUCH ACTUATOR. DURING ACTUATOR ASSEMBLY INSTALLATION, BEAM HANGAR CAN ROTATE ABOUT BOLT (7) AND TOUCH ACTUATOR. DAMAGE TO BEAM HANGAR CAN OCCUR IF BEAM HANGAR TOUCHES ACTUATOR.
B. Rest inboard ends of actuator and walking beam on shock strut.
C. Raise outboard end of assembly to align fork ends of beam hanger shaft (8, Fig. 401) over brackets on structure. Note that beam hanger shaft is oriented with longest clevis end installed adjacent to rear spar.
Feb 01/95 32-32-11 Page 402A/402B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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