(e)
Measure the actual "X" dimension on the strut as shown on Fig. 302.
(f)
Use the chart on Fig. 302 to find the "X" dimension that corresponds to the pressure you measured.
(g)
Add nitrogen to the shock strut until the pressure is 300 +/- 20 psig.
(h)
Tighten the swivel nut to 5 -7 pound-feet to close the air valve.
(i)
Remove the pressure gage from the shock strut.
(j)
Install the cap for the air valve.
S 583-031
(2) Lower the airplane and remove the jacks (AMM 07-11-01/201).
TASK 12-15-01-603-001
5. Servicing of the Shock Strut with Fluid and Nitrogen
____________________________________________________
A. General
(1) If the shock strut is new or has been overhauled then use the procedure to replace the fluid.
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B. Equipment
(1)
Strut Inflation Tool - F70200-14
(2)
Pressure Gage, 250 to 2500 PSIG - Commercially Available
(3)
Container, 5 Gallon Capacity
C. Consumable Materials
(1)
Dry nitrogen (recommended), 2200 psi (commercially available)
(2)
Dry air (optional), 2200 psi (commercially available)
(3)
D00467 Fluid - Fully Formulated BMS 3-32 Type I, II (Preferred)
(4)
D00212 Hydraulic Fluid MIL-H-5606 or MIL-H-6083 (Optional)
(5)
D00510 Lubrizol 1395 (Optional)
D. References
(1)
AMM 32-00-15/201, Landing Gear Door Locks
(2)
AMM 32-00-20/201, Landing Gear Downlocks
E. Access
(1) Location Zones
731/741 Main Landing Gear
F. Procedure to Adjust the Fluid Level of the Shock Strut
S 863-005
WARNING: MAKE SURE THE AREA BELOW THE WING IS CLEAR BEFORE YOU DEFLATE
_______ THE SHOCK STRUT. IF YOU DEFLATE ONE SHOCK STRUT, THE WING TIP CAN MOVE DOWN AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Deflate the shock strut of the main landing gear.
(a) Remove the cap from the air valve (Detail A, Fig. 301).
WARNING: LOOSEN THE SWIVEL NUT FOR THE AIR VALVE A MAXIMUM OF TWO
_______ TURNS. DO NOT LOOSEN THE AIR VALVE BODY. AIR PRESSURE CAN BLOW THE VALVE OFF AND CAN CAUSE INJURY TO PERSONS.
(b)
Loosen the swivel nut for the air valve a maximum of two turns.
(c)
Let the shock strut fully deflate.
(d)
Install a flexible hose on the air valve and put the other end of the hose in the drain bucket.
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(e) Fully loosen the swivel nut for the air valve to open the valve.
S 613-006
CAUTION:_______ USE ONLY THE TYPE OF FLUID WHICH IS SPECIFIED IN THIS PROCEDURE
TO FILL THE SHOCK STRUT. IF YOU USE AN INCORRECT FLUID, IT CAN
CAUSE DAMAGE TO THE SEALS.
CAUTION: DO NOT ADD SMALL QUANTITIES OF HYDRAULIC FLUID WITHOUT LUBRIZOL
_______ MANY TIMES. THIS CAN DECREASE THE LUBRICITY OF THE FLUID IN THE STRUT WHICH CAN CAUSE DAMAGE TO THE STRUT.
(2) Fill the shock strut with fluid.
(a)
Remove the dust cap from the oil charging valve (Fig. 301, Detail B).
(b)
Attach an oil charging line to the oil charging valve.
(c)
Make sure the air valve is fully open.
CAUTION: CLEAN ALL THE LEAKED HYDRAULIC FLUID FROM THE TIRES
_______ IMMEDIATELY. THE HYDRAULIC FLUID CAN CAUSE DAMAGE TO THE TIRES.
(d)
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