(b)
Remove the cap from the air valve.
(c)
Install a pressure gage on the shock strut to measure the pressure. Use the instructions supplied with the tool.
CAUTION: LOOSEN THE NUT FOR THE AIR VALVE A MAXIMUM OF TWO TURNS.
_______ DO NOT REMOVE THE VALVE BODY ON A PRESSURIZED STRUT. AIR PRESSURE CAN BLOW THE VALVE OUT AND INJURE PERSONNEL.
(d)
Loosen the swivel nut for the air valve two turns and measure the pressure of the shock strut.
(e)
Add nitrogen to the shock strut until the pressure is 200 +/- 10 psig.
(f)
Tighten the swivel nut to 5 -7 pound-feet to close the air valve.
(g)
Remove the pressure gage from the shock strut.
(h)
Install the cap for the air valve.
S 583-032
(2) Lower the nose of the airplane and remove the jacks (AMM 07-11-02/201).
TASK 12-15-02-603-002
5. Servicing of the Shock Strut with Fluid and Nitrogen
____________________________________________________
A. Equipment
(1)
Shock Strut Inflation Tool - F70200-14
(2)
Pressure Gage, 0 to 2000 PSIG - Commercially Available
B. 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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-15-02
ALL ú ú 01 Page 307 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
C. References
(1)
AMM 32-00-15/201, Landing Gear Door Locks
(2)
AMM 32-00-20/201, Landing Gear Downlocks
D. Access
(1) Location Zones
711 Nose Landing Gear
E. Procedure to Adjust the Fluid Level of the Shock Strut
S 863-005
(1) Deflate the shock strut of the nose landing gear.
(a)
Remove the cap from the air valve (Detail A, Fig. 301).
(b)
Install a flexible hose on the air valve and put the other end of the hose in the drain bucket.
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.
(c)
Loosen the swivel nut for the air valve two turns.
(d)
Let the shock strut fully deflate.
(e)
Fully loosen the swivel nut for the air valve to open the valve.
S 613-033
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.
(b)
Attach an oil charging line to the oil charging valve.
(c)
Make sure the air valve is fully open.
CAUTION: CLEAN ALL THE 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.
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