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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.
2.  Equipment and Materials
A.  Low pressure servicing cart for MIL-H-5606, MIL-H-6083 hydraulic fluid or fully formulated shock strut fluid (Ref 20-30-21)
B.  Hose to suit air valve
C.  Suitable container to collect hydraulic fluid (approximately 3-gallon capacity)
D.  Dry air or nitrogen bottle charged to 2500 psi
E.  Airplane jacks
F.  Strut Inflation Tool - F70200-1
G.  (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.
H.  (Optional) As a substitute for BMS3-32, Type I, operators may mix the MIL-H-6083 with 2.4% by volume of Lubrizol1395. As a substitute for BMS3-32, Type II, operators may mix the MIL-H-5606 with 2.4% by volume of Lubrizol 1395.
NOTE:  Avoid adding the Lubrizol directly. We recommend thoroughly premixing the Lubrizol with 10 parts shock strut fluid before pouring the additive into the strut.
3.  Service Nose Landing Gear Shock Strut
A.  Jack nose of airplane with fuselage nose jack until nose shock strut is fully extended. Lower tail support jack as nose is raised (Ref Chapter 7, Jacking Airplane).
B.  Deflate shock strut.
(1)  
Remove valve cap from air valve at top of shock strut (Fig. 201).

(2)  
Remove lockwire and loosen air valve nut two turns maximum.

WARNING:  DO NOT REMOVE VALVE BODY. INTERNAL PRESSURE CAN BLOW BODY OUT, CAUSING POSSIBLE INJURY TO PERSONNEL.
NOTE:  Fluid in shock strut will start foaming immediately as pressure is reduced to ambient. Deflate shock strut slowly to prevent loss of fluid through air valve.
May 01/99 12-15-41 Page 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

C.  Remove check valve sealing cap from bottom of shock strut and connect servicing cart output hose to check valve (Detail B, Fig. 201).
D.  Connect hose to air valve on top of shock strut and check that air valve is open as far as possible. Place other end of hose to drain into container.
E.  Pump fluid into shock strut from servicing cart until fluid overflows into container.
F.  Steps (1) thru (4) are only required when completely filling the shock strut.
(1)  
Slowly stroke shock strut with an axle jack through one complete compression and extension cycle. Do not allow end of waste fluid hose to become submerged below surface of waste fluid while strut is being stroked. This will prevent sucking contaminated fluid back into shock strut.

(2)  
Remove axle jack.

(3)  
Deleted.

(4)  
Pump fluid into strut with servicing cart until fluid flows from top of strut through waste fluid hose.

G.  Disconnect servicing cart and install check valve sealing cap.
504 
12-15-41 Page 202  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/84 

543  Nose Gear Shock Strut Air Valve 
Feb 15/73  Figure 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  12-15-41 Page 203 

H.  Lower nose of airplane with fuselage nose jack until shock strut is fully compressed and overflow fluid ceases to flow into container.
NOTE:  If no fluid is expelled from shock strut during step H, an excessive amount of fluid was lost during step G. Shock Strut must be reserviced by repeating steps A and C thru H.
I.  Remove fuselage nose jack.
J.  Remove hose from top of shock strut and remove service cart.
K.  On airplanes not using fully formulated shock strut fluid, add shock strut fluid extreme pressure additive and seal lubricant (optional).
(1)  
Remove air valve from top or shock strut and remove approximately four ounces of fluid.

(2)  
Pour in two ounces of Lubrizol. Top off with clean fluid.

NOTE:  Avoid adding the Lubrizol directly. We recommend thoroughly premixing the Lubrizol with 10 parts shock strut fluid before pouring the additive into the strut.

(3)  
Replace air valve.

L.  Reinstall air valve in top of shock strut.
M.  Inflate shock strut with dry air or nitrogen to the servicing placard (Fig. 202).
N.  Return airplane to service, and after 5 to 10 landings do the following steps:
　
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