(e)
Continue to fill the shock strut until the fluid which flows into the bucket is free of bubbles.
(f)
Remove the oil charging line.
(g)
Replace the dust cap for the oil charging valve.
(h)
Remove the overflow hose from the air valve.
S 863-007
(3) Inflate the shock strut for the main landing gear with dry Nitrogen.
(a) Install the strut inflation tool. Use the instructions supplied with the tool.
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A
757 MAINTENANCE MANUAL
CAUTION: NITROGEN ENTRAINMENT IN THE FLUID CAN CAUSE THE SHOCK
_______ STRUT TO DEFLATE TOO MUCH. WHEN THE SHOCK STRUT IS DEFLATED, THE "X" DIMENSION FROM FIGURE 302 SHOULD BE INCREASED 1.5 INCHES FOR A GIVEN PRESSURE TO COMPENSATE FOR THE NITROGEN ENTRAINMENT.
(b)
Add nitrogen to the shock strut until the "X" dimension is 1.5 inches above the upper limit for the indicated pressure, as shown on Fig. 302.
(c)
Tighten the swivel nut to 5 - 7 pound-feet to close the air valve (Detail A, Fig. 301).
(d)
Remove the strut inflation tool.
(e)
Install the cap for the air valve (Detail A, Fig. 301).
S 613-038
(4) Five to ten landings after you did a complete oil and nitrogen servicing, do steps to inflate the shock strut with dry nitrogen again.
G. Procedure to Replace the Fluid in the Shock Strut (A New or Overhauled Shock Strut)
S 613-040
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.
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757
MAINTENANCE MANUAL
(d)
Install a flexible hose on the air valve and put the other end of the hose in the drain bucket.
(e)
Fully loosen the swivel nut for the air valve to open the valve.
S 613-035
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)
Fill the shock strut with fluid until the fluid flows into the drain bucket.
(e)
Continue to fill the shock strut until the fluid which flows into the bucket is free of bubbles.
(f)
Remove the oil charging line.
(g)
Replace the dust cap for the oil charging valve.
(h)
Remove the overflow hose from the air valve.
S 613-036
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