(a)
Carefully put the actuator trunnion into the bearing of the top plate and the swivel valve (View D-D).
(b)
Make sure you align the index pin on the swivel valve.
(c)
Hold the free end of the actuator up to make sure the bearing will be aligned.
(d)
Install the top trunnion nut with the wrench to make sure the nut and the bearing just touch.
S 644-022
(5)
Apply hydraulic fluid to the threads on the retainer nut for the metering valve.
S 434-023
(6)
Use a spanner wrench to install the retainer nut for the swivel valve (View D-D) and tighten the nut.
S 394-024
(7)
Apply fillet seal between the retainer nut for the swivel valve and the actuator top trunnion.
S 644-025
(8)
Butter lubricate the top shock strut and the mating threads of the steering nut with grease (Detail B).
S 034-026
(9)
Remove the left and right trunnion bearings (View B-B).
S 984-027
(10)
Lift the lower plate into its position against the steering collar (View B-B).
(11)
Install the steering nut on the top shock strut.
S 434-029
(12)
Tighten the steering nut with the wrench adapter only until the lower plate seats against the shoulder of the steering collar.
S 434-028
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S 434-030
(13)
Tighten the steering nut (Detail B).
S 984-017
(14)
Release the collar support and make sure the collar turns freely.
S 434-031
(15)
Do the steps that follow to install the lockplate (View C-C):
(a)
Put the lockplate on two of the three alignment holes in the steering nut. Do not attach the lockplate to the steering nut.
(b)
Turn the lockplate on the other side and change the alignment holes to permit four different positions for the lockplate key.
(c)
Use the wrench adapter to loosen the steering nut.
(d)
Align the key with the nearest slot on the plate.
(e)
Butter lubricate the mating surfaces on the lockplate and steering nut with grease.
(f)
Lubricate the lockplate bolts with grease.
(g)
Attach the lockplate to the steering nut.
(h)
Lubricate the steering nut with grease at the fitting.
(i)
Tighten the lockplate bolts (View C-C).
(j)
Install lockwire on the bolts.
S 434-032
(16)
Install the lower trunnion bearings and use the trunnion nuts to help seat the bearings.
S 034-033
(17)
Remove the top and lower trunnion nuts.
S 394-034
(18)
Apply sealant to the threads on the top and lower actuator trunnion (View B-B).
S 984-035
(19)
Use the upper torsion link to turn the collar until the holes in the actuator rod and collar align (View A-A). Do not install the pin in this step.
S 434-036
CAUTION:_______DO NOT TIGHTEN THE TRUNNION NUTS TOO MUCH. DO NOT TURN THE NUT MORE THAN 8 DEGREES THROUGH THE POINT WHERE THE SURFACES FIRST TOUCH. THIS WILL PREVENT DAMAGE TO THE BEARINGS. WHEN YOU TIGHTEN THE NUTS, DO NOT PERMIT THE NUTS TO TOUCH THE BEARING SEALS OR SHIELDS.
(20)
Make sure the conditions that follow occur when you use the wrench to install and tighten the top and lower trunnion nuts:
(a)
The threads that come out of the top and lower ends are equal (View B-B).
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(b) The clearance between the faces of the rod end bearings and the faces of the clevis bushings on the steering collar have less than 0.005 inch difference (View A-A). If these two conditions do not occur you must seat the bearings again.
S 434-037
(21)
Tighten the lower trunnion nut last until it touches the inner races of the trunnion bearings.
S 394-038 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3(132)
