(3)
Turn collar (38) approximately 110 degrees right.
(4)
Remove left steering cylinder attach bolt and two steering collar bolt bushings.
(5)
Remove forward and aft steering collar halves (21 and 32).
(6)
Remove upper torsion link pin (36) and remove upper torsion link (35).
May 01/03 32-51-51 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G. Remove support plates (9 and 13).
(1)
Support steering cylinder assembly and remove upper and lower support plate attach bolts (11 and 17). Remove as unit.
(a)
Remove upper and lower trunnion locknuts (6 and 16).
(b)
Remove steering cylinder assembly (12).
(c)
Separate the steering cylinders (12) from support plates (9 and 13).
(2)
Remove forward and aft bearing halves (20 and 30).
NOTE: These bearings are matched pairs. Forward bearing half (20) has a slot which fits onto bracket (31) key, to prevent bearing from rotating.
3. Install Steering Cylinders
A. Clean support plates (9 and 13, Fig. 401) and apply a light coat of grease to all mating or bearing surfaces.
NOTE: Support plates are matched sets. If only one plate is replaced, it must be machined to match the existing plate.
B. Install upper and lower bearings (8 and 14) and support plate spacers (45).
C. Position steering cylinders (12) in lower support plates (13).
D. Pack cavities between steering cylinder lower trunnions and lower support plate with corrosion preventive compound. Pack keyway slots with corrosion preventive compounds (MIL-C-16173C).
E. Install washers (15) and start lower trunnion locknuts (16) but do not tighten.
F. Position steering cylinders (12) in upper support plate (9) and pack cavities between upper trunnions and support plate with corrosion preventive compound. Pack keyway slots with corrosion preventive compounds (MIL-C-16173C).
G. Install washers (7) and start upper trunnion locknuts (6) but do not tighten.
H. Thoroughly clean all mating surfaces between outer cylinder and bearing halves and apply a light coat of grease.
I. Install forward and aft bearing halves (20 and 30).
NOTE: Bearings are matched pairs. Serial numbers on forward and aft bearing flanges should be located together.
J. Install upper and lower support plates and steering cylinders (loosely fitted) as a unit. Install and tighten support plate attach bolts (11 and 17) to 1000-1300 pound-inches.
K. Install Steering Collars
(1)
Thoroughly clean all mating surfaces and apply a light coat of grease.
(2)
Check that steering collars (21 and 32) to be installed are a matched set and that laminated shims bonded to aft collar are intact.
(3)
Position forward and aft collar halves (21 and 32) on shock strut (28).
(4)
Install upper flanged bushing (22).
(5)
Check gap between forward and aft collar halves is 0.02 +0.01 inch.
(6)
Pack and fillet seal gap with sealant.
CAUTION: THE CURING OF THE SEALANT IS CRUCIAL TO THE LUBRICATION OF THIS BEARING. IMPROPER CURING MAY RESULT IN STEERING COLLAR BEARING FAILURE.
(7)
Lubricate steering collar (Ref 12-21-21).
575
32-51-51 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/01
L. Connect upper torsion link to steering collar. Do not connect torsion links at apex.
M. Check steering collar for freedom of movement.
(1)
Apply a maximum force of 5 pounds horizontally to apex end of upper torsion link with torsion link held horizontal.
(2)
Check that steering collar is free to rotate 90 degrees in either direction.
N. Turn steering collar approximately 55 degrees left and install right steering collar bolt (23) and steering collar bolt bushings (19 and 22).
O. Tighten nut to 600-700 pound-inches lube torque.
P. Turn collar approximately 110 degrees right and install left steering collar bolt and steering collar bolt bushings (19 and 22).
Q. Tighten nut to 600-700 pound-inches lube torque.
R. Tighten trunnion locknuts (6 and 16) finger-tight (35 in-lbs) (vertical looseness removed) and advance to nearest position where a washer tab can be pressed into a nut lock-slot. Spray nuts, trunnion threads, and tag washer with LPS-3.
NOTE: Check clearances prior to locking. Readjust if necessary.
S. Turn torsion link and steering collar approximately 55 degrees left. Install right hand cable guard and adjust to clear pulley by 0.015 to 0.045 inch.
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