(b)
Install the strut inflation tool. Use the instructions supplied with the tool.
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.
(c)
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.
(d)
Tighten the swivel nut to 5 - 7 pound-feet to close the air valve (Detail A, Fig. 301).
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757 MAINTENANCE MANUAL
(e)
Remove the strut inflation tool.
(f)
Install the cap for the air valve (Detail A, Fig. 301).
S 613-039
(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.
TASK 12-15-01-843-037
6. Put the Airplane Back to Its Usual Condition____________________________________________
A. References
(1) AMM 32-00-15/201, Landing Gear Door Locks
B. Put the Airplane Back to its Usual Condition
S 863-009
(1)
Remove the DO-NOT-OPERATE tag from the control lever for the landing gear.
S 863-008
(2)
Put the control lever for the landing gear to the DN position.
S 093-010
WARNING:_______OBEY THE REMOVAL PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Remove the door locks and close the doors (AMM 32-00-15/201).
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757 MAINTENANCE MANUAL
NOSE GEAR SHOCK STRUT - SERVICING
_________________________________
1. General
_______
A. This procedure contains the data necessary to do the servicing of the shock strut for the nose landing gear.
(1)
Do the Prepare to Inspect/Service the Shock Strut procedure before you do any of the inspection/servicing procedures in this section.
(2)
Do the Put the Airplane Back to Its Usual Condition procedure after you do any of the inspection/servicing procedures in this section.
B. You can see fluid loss on or around the shock strut when there is oil on the gear or puddles of oil on the ground. Fluid loss can also occur with very slow leakage that you may not see. If you think that the strut does not have the correct amount of oil, do the Pressure Check at Two Points. If you think the strut has the correct amount of oil do the Servicing of the Shock Strut with Nitrogen Only.
TASK 12-15-02-613-055
2. Nose Gear Shock Strut Fluids
____________________________
A. Shock Strut Lubricants
S 643-069
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.
CAUTION: DO NOT ADD THE LUBRIZOL DIRECTLY INTO THE SHOCK STRUT.
_______ THOROUGHLY PRE-MIX THE LUBRIZOL WITH 10 PARTS OF SHOCK STRUT FLUID BEFORE YOU ADD THE FLUID INTO THE STRUT.
(1) You must add a lubricant to the shock strut during the servicing. As an alternative, you can use a fluid which has an added lubricant. For usual servicing when small quantities of fluid are necessary, you can use fluid without lubricant to fill the shock strut.
B. Shock Strut Fluids
S 643-057
(1)
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.
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