12-15-31
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
10) Connect the hose to the air valve on top of the shock strut.
NOTE:____ The air valve must be open fully.
a) Put the other end of the hose to drain into the container. 11) Fill the shock strut with the fluid from the service cart until the fluid flows into the container.
(4) S 083-008Disconnect the service cart and remove the hose from the top of shock strut.
(5) S 613-009Inflate the shock strut with dry air or nitrogen to agree to the service chart (Fig. 302).
(6) S 863-010Close the air valve at the top of the shock strut.
(7) S 423-011Install the dust cap and install lockwire to the air valve.
(8) S 863-012Put the airplane to its normal operation.
(9) S 213-013After 5 to 10 landings, do the steps that follow: (a) Examine the shock strut pressure and X dimension. 1) If it is necessary, inflate the shock strut. (b) Service the shock strut with air or nitrogen (Fig. 302).
NOTE:____ The wide tolerance "Operation Band" does not eliminate the requirement for two separate charging operations to the "Servicing Band".
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A
737-300/400/500MAINTENANCE MANUAL
TASK 12-15-31-603-013
3. Main Landing Gear Shock Strut Service - Procedure II (Strut dry after repair,____________________________________________________ or airplane is lifted on jacks), (Fig. 301)
A. General
(1)
This procedure contains a task to service the shock strut after you drain and disassemble the shock strut for repairs or when you add fluid while the airplane is lifted on jacks.
(2)
A procedure to service the shock strut with dry air or nitrogen only is provided in this task.
CAUTION: DO NOT ADD SMALL QUANTITIES OF HYDRAULIC FLUID WITHOUT LUBRIZOL
_______ MANY TIMES. IF THERE IS NOT A SUFFICIENT QUANTITY OF LUBRIZOL IN THE FLUID, DAMAGE TO THE SHOCK STRUT CAN OCCUR.
(3)
You can add lubricant to the shock strut when servicing. As an alternate method, a fully formulated fluid with a lubricant premixed is available. For regular servicing where relatively small amounts of fluid is necessary, it is acceptable to use hydraulic oil without added lubricant to fill the shock struts.
(4)
Shock Strut Fluids - General
(a)
All of the fluids that are listed here are compatible. Use any of these fluids to top off the strut even if the strut was originally filled with one of the other fluids.
(b)
Lubrizol 1395 and methyl oleate are heavy duty lubricants. They are added to the fluid to reduce the wear on the parts of the shock strut that move.
(c)
Use BMS 3-32, Type I to fill the shock strut for the first time when new, or after overhaul. There is a corrosion inhibitor in the MIL-H-6083 fluid.
(d)
Use BMS 3-32, Type I or Type II at the operator's discretion, for subsequent refills or to top off the strut. These two types of fluid are compatible.
(e)
If the proper mixture is not available, You can use MIL-H-6083 or MIL-H-5606 fluid without additives to top off the strut. Try not to do this, however, because the additive that is already in the strut will become more diluted. This will make it less effective.
(f)
It is not necessary to change the seals in the shock strut if you drained the strut and filled with one of the other fluids.
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(5)
(6)
A
737-300/400/500MAINTENANCE MANUAL
(g)
Use the premixed fluid, BMS 3-32 Types I and II, if it is possible. This is more convenient for the operator and will remove the possiblility of error that can occur when the operator mixes the fluids.
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