(b)
After 4 days deflate the shock strut and add oil until it is completely full. Then service the strut with nitrogen (AMM 12-15-02/301).
(c)
Do the 2 and 4 day servicing steps again until you change the seals.
S 212-144
(8) If the leakage was more than 30 drops during the 15 minute period, the shock strut is not serviceable. You must replace the seals.
TASK 32-21-25-962-001
3. Active Seal Replacement With the Spare Seals (Figs. 201, 202)
____________________________________________
A. Equipment
(1)
Axle Jack - automotive type (Commercially available)
(2)
Lower Bearing Seal Retainer Puller Equipment, NLG - B32024-82
(3)
Gland Nut Wrench Adapter, NLG - A32045-19
(4)
Drain Equipment - MLG/NLG Shock Strut, A32066-1
(5)
Container
B.
Consumable Materials
(1)
C00913 Compound - BMS3-27
(2)
D00151 Lubricant - Petrolatum VV-P-236
(3)
D00062 Grease - MIL-G-4343
32-21-25
ALL ú ú 01 Page 209 ú Jan 28/00
A
757
MAINTENANCE MANUAL
(4)
D00633 Grease - BMS 3-33 (Recommended)
(5)
D00013 Grease - MIL-G-23827 (Alternative)
(6)
D00070 Lubricant - Hydraulic Fluid MIL-H-5606
C.
References
(1)
AMM 07-11-02/201, Jacking Airplane Nose
(2)
AMM 12-15-02/301, Nose Gear Shock Strut
(3)
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(4)
AMM 32-00-15/201, Landing Gear Door Locks
(5)
AMM 32-00-20/201, Landing Gear Downlocks
D.
Access
(1)
Location Zones
711 Nose Landing Gear (NLG)
713/714 NLG Door Forward
715/716 NLG Door Aft
E.
Prepare to Replace the Active Seals
S 492-002
(1) Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
S 492-003
WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2)
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
S 862-004
(3)
Remove the pressure from the left hydraulic system
(AMM 29-11-00/201).
S 862-005
(4)
Deflate the shock strut for the nose landing gear (Detail A).
(a)
Remove the cap (1) on the air valve which is at the top of the shock strut.
WARNING:_______LOOSEN THE SWIVEL NUT A MAXIMUM OF TWO TURNS. AIR PRESSURE CAN BLOW THE VALVE OFF AND CAN CAUSE INJURY TO PERSONS.
(b)
Loosen the swivel nut (2) a maximum of two turns.
(c)
When all of the pressure in the shock strut is removed, loosen the swivel nut (2) fully.
32-21-25
ALL ú ú 01 Page 210 ú Jan 28/02
A
757
MAINTENANCE MANUAL
(5) S 032-006Disconnect the upper torsion link from the lower torsion link (AMM 32-21-09/401) .
(6) S 582-008Lift the nose of the airplane until you see approximately 12 inches of chrome on the inner cylinder of the shock strut (AMM 07-11-02/201).
(7) S 842-009Wind a cloth around the inner cylinder (8) of the shock strut below the gland nut (22). This will prevent damage to the inner cylinder (8) if the gland nut (22) moves down.
(8) S 012-010Remove the cap (3) from the oil charging valve (5).
(9) S 492-011Install the drain equipment on the oil charging valve (5).
S 492-012
(10) Put a container in position to catch the hydraulic fluid when the swivel nut (4) is loosened.
S 032-015 CAUTION: CLEAN ALL THE LEAKED HYDRAULIC FLUID FROM THE TIRES
_______ IMMEDIATELY. THE FLUID CAN CAUSE DAMAGE TO THE TIRES.
(11)
Loosen the swivel nut (4) on the oil charging valve (5) to drain the oil from the shock strut.
S 012-013
(12)
Remove the oil charging valve (5). S 432-014
CAUTION:_______TIGHTEN THE PLUG WITH YOUR HAND. THE PLUG CAN CAUSE DAMAGE TO THE CENTERING CAM IF THE PLUG IS TOO TIGHT.
(13)
Install the plug (25) in the hole (Fig. 202, Detail A). NOTE: The plug holds the lower cam in position when the lower
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 2(16)
