536  Main Gear Damper Installation 
Feb 01/95  Figure 401  32-11-81 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

L.  Tighten apex nut (8) 400 to 500 pound-inches torque. Loosen apex nut to 0 torque then retighten nut finger-tight. Tighten nut until next available hole in nut aligns with a hole in lockwasher.
M.  Install lockbolt (9), washer and nut in apex nut and lockwasher.
N.  Install checknut (6). Tighten checknut 50 to 150 pound-inches torque.
O.  Deleted.
P.  Lockwire checknut (6) to lockbolt (9).
Q.  Remove plug and cap and connect hydraulic return line (14) to damper.
R.  Pressurize hydraulic system A and check hydraulic connection to damper for leaks (Ref 29-11-0 MP).
S.  Open the filler and bleed valve (16) approximately one turn.
CAUTION:  PROTECT TIRES, GEAR STRUCTURE, AND SURROUNDING AREA FROM ACCIDENTAL HYDRAULIC FLUID SPILLAGE. HYDRAULIC FLUID CAN CAUSE DAMAGE TO EQUIPMENT.
T.  Cycle landing gear control lever from DN to UP then DN to charge shimming damper compensator, making fluid available for bleeding of damper.
WARNING:  MAKE SURE THAT THE GROUND LOCKPINS ARE INSTALLED IN ALL THE LANDING GEAR TO PREVENT THE ACCIDENTAL OPERATION OF THE GEAR. INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT COULD OCCUR IF THE GEAR RETRACTS.
U.  Allow fluid to flow until clear of air before tightening. Close the filler and bleed valve (16). It may be necessary to cycle control lever several times during bleeding of damper to ensure adequate fluid.
V.  Lockwire hydraulic return line, bleed plugs and filler bleed valve.
W.  Do a check of the hydraulic system fluid reservoir level (Ref\29-15-00\MP).
X.  Determine if there is further need for hydraulic power; if not, shut down source.
501 
32-11-81 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/94 

MAIN GEAR DAMPER - ADJUSTMENT/TEST
1.  Main Gear Damper Adjustment
A.  General
(1)  Head of damper piston must protrude outside of damper housing before tightening apex nut. If the piston head is flush with housing, raise main gear on axle jack, or use a length of timber to pivot wheels around until piston head protrudes.
B.  Adjust Main Gear Damper
(1)  
Measure distance that damper piston head protrudes from end face of gland nut on housing (Fig. 501). If head of damper piston is not within these dimensions the damper piston may be bottomed out. Rotate lower torsion link until piston head protrusion is within the above dimensions.

(2)  
Remove lockwire from checknut to lockbolt.

(3)  
Remove lockbolt and tighten torsion link apex nut 400 to 500 pound-inches torque.

(4)  
Loosen apex nut to 0 torque then retighten nut finger-tight. Tighten nut until next available hole in nut aligns with a hole in lockwasher.

(5)  
Install lockbolt, washer and nut in apex nut and lockwasher.

(6)  
Tighten checknut 50 to 150 pound-inches.

(7)  
Lockwire checknut to lockbolt.

2.   Main Gear Damper Test
A.  Test Main Gear Damper
(1)  
Visually check unit for leakage at bleeder plugs, filler valve, hydraulic line connection, and piston rod seals.

(2)  
Set gear per par. 1.A.

(3)  
Push thrust washer up against lower torsion link.

(4)  
Measure gap between thrust washer and apex nut. If gap does not exceed 0.005 inch maximum, no further adjustment is required. If gap exceeds 0.005 inch, check apex thrust washers and lower torsion link bushings for excessive wear and proceed with adjustment per par. 1.B.

505 
Feb 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-11-81 Page 501 

Main Gear Damper Adjustment  536 
32-11-81  Figure 501  Feb 01/95 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MAIN GEAR DAMPER - INSPECTION/CHECK
1.  General
A.  These data consists of illustrations and wear limit charts. No procedure is given in this section for access to permit inspection. Refer to Main Gear Damper - Removal/Installation for removal procedure.
2.  Main Gear Damper Wear Limits
501 
Aug 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-11-81 Page 601 
　
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