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B.  There is no simple method for checking the fluid level within a depressurized strut after any pressurization such as raising the airplane by pressurizing the strut with air or nitrogen. Gas entering into solution with the fluid changes the effective volume of the fluid. The complete servicing procedure must be performed to properly fill the shock strut.
C.  A lubricant is added to the shock strut when servicing. As an alternate, fully formulated fluid with a lubricant premixed is available. For routine servicing where relatively small amounts of fluid are required, it is acceptable to use hydraulic oil without added lubricant to top off shock struts.
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.
NOTE:  Unless the shock strut is completely drained and refilled, the new yellow colored fluid may be used to top off a strut containing the red colored fluid, resulting in a mixture being brown in color.
2.  Service Main Landing Gear Shock Strut -Procedure I (Strut in normal service -Airplane not jacked)
A.  General
(1)  This procedure must be used to add fluid to a shock strut that has been in normal operation and inflated up to the time that servicing is required. This procedure is performed without jacking the airplane. Once this procedure is started, the airplane must not be jacked or moved in any way that will allow the shock strut to partially extend until the entire procedure has been completed.
B.  Equipment and Materials
(1)  
Low pressure servicing cart for MIL-H-5606, MIL-H-6083 hydraulic fluid or fully formulated shock strut fluid (Ref 20-30-21)

(2)  
Hose to suit air charging valve

(3)  
Suitable container to collect hydraulic fluid (approximately 5-gallon capacity)

(4)  
Dry air or nitrogen bottle charged to 2500 psi minimum

(5)  
Strut Inflation Tool - F70200-1

(6)  
(Preferred) Fully formulated BMS3-32 Type I (with corrosion inhibitor) or Type II (without corrosion inhibitor). BMS3-32, Type I is used to fill a strut for the first time after being overhauled. Subsequent refills may be done with BMS3-32 Type I or Type II.

(7)  
(Optional) As a substitute for BMS3-32, Type I, operators may mix the MIL-H-6083 with 2.4% by volume of Lubrizol 1395. As a substitute for BMS3-32, Type II, operators may mix MIL-H-5606 with 2.4% by volume of Lubrizol 1395.

NOTE:  Avoid adding the Lubrizol directly. We recommend thoroughly pre-mixing the Lubrizol with 10 parts shock strut fluid before pouring the additive into the strut.
500 
May 01/01  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  12-15-31 Page 201 

Main Landing Gear Shock Strut Charging Valve  500 
12-15-31  Figure 201  Feb 20/92 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

C.  Service Main Landing Gear Shock Strut
(1)  Completely deflate shock strut by removing dust cap from charging valve on top of shock strut and slowly opening air valve nut two turns maximum (Fig. 201).
WARNING:  DO NOT REMOVE VALVE BODY. INTERNAL PRESSURE CAN BLOW BODY OUT CAUSING POSSIBLE INJURY TO PERSONNEL.
NOTE:  Fluid in the shock strut will start foaming immediately as pressure is reduced to ambient. Deflate shock strut slowly to prevent loss of fluid through air valve.
(2)  Remove foamed fluid and fill with fluid by either of the following methods:
(a)  Flushing Method 1) Remove check valve sealing cap. 2) Connect servicing cart to drain tube check valve. 3) Connect an overflow hose to air valve on top of shock strut and check that air
valve is fully opened. Place other end of hose to drain into container. 4) Pump fluid from service cart into shock strut until approximately 3 gallons of fluid overflows into container to ensure all foamed fluid has been displaced.
5)  On airplanes not using fully formulated shock strut fluid, add shock strut fluid extreme pressure additive and seal lubricant (optional). a) Remove air valve from top of shock strut and remove approximately one
pint of fluid. b) Pour in 11 ounces of Lubrizol and top off with clean fluid.
NOTE:  Avoid adding the Lubrizol directly. We recommend thoroughly pre-mixing the Lubrizol with 10 parts shock strut fluid before pouring the additive into the strut.
c)  Replace air valve.
(b)  Draining Method 1) Remove check valve and completely drain shock strut. 2) Remove seal cap from check valve. Apply shock strut fluid to valve threads.
Install check valve snug with bottom of drain tube. Tighten 8-10 foot-pounds
　
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