757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3(135)

 C.
Parts

 ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Module - NLG Steering Metering | 32-51-11 | 01 | 5 | | | | Valve | | | | | | 2 | Bolt | | | 15 | | | 3 | Washer | | | 20 | | | 4 | Washer | | | 25 | | | 5 | Nut | | | 30 | | | 6 | Bolt | | | 10 | | | 7 | Nut - Retainer | | | 5 | | | 8 | Ring | | | 50 | | | 9 | Ring | | | 60 | | | 10 | Packing | | | 55 | | | 11 | Packing | | | 45 | 2.......….......…...................................…...........….....…........1
 D. References
 (1)  
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic Systems

 (2)  
AMM 32-00-20/201, Landing Gear Downlocks

 (3)  
AMM 32-21-09/401, Nose Gear Torsion Links

 (4)  
AMM 32-51-00/501, Nose Wheel Steering System

 E.
Access

 (1)  
Location Zones
 115 NLG Wheel Well (Left)
 116 NLG Wheel Well (Right)
 211 Control Cabin (Left Side)
 212 Control Cabin (Right Side)
 711 Nose Landing Gear (NLG)

 F.
Procedure

 S 494-023
 (1)  Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
 

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 (2)  S 864-024Make sure the pressure is removed from the left hydraulic system and reservoir (AMM 29-11-00/201).
 (3)  S 434-025Install new packings and ring on the swivel valve.
 (4)  S 644-026Lubricate the fittings, packings, and seals on the metering valve with hydraulic fluid.
 (5)  S 614-027Fill the metering valve with hydraulic fluid until it is full.
 S 424-028

 CAUTION: MAKE SURE THE INDEX PINS ON THE SWIVEL VALVES ARE CORRECTLY
_______ ALIGNED WITH THE MATING HOLES IN THE ACTUATOR TRUNNION. IF THEY ARE NOT ALIGNED CORRECTLY, IT IS POSSIBLE THE STEERING SYSTEM WILL NOT OPERATE CORRECTLY OR YOU CAN CAUSE DAMAGE TO THE STEERING SYSTEM.
 (6)  
Put the swivel valves for the metering valve assembly into the steering actuator trunnions. Make sure the valve index pins are installed in the locator pin holes in the left and right trunnions (View A-A).

 S 644-029

 (7)  
Apply hydraulic fluid to the threads on the left and right retainer nuts for the metering valve.

 S 434-030
 CAUTION: TIGHTEN THE RETAINER NUTS FOR THE METERING VALVE EQUALLY DURING
_______ INSTALLATION. IF YOU DO NOT TIGHTEN THE RETAINER NUTS EQUALLY, THIS CAN CAUSE DAMAGE TO THE VALVE ASSEMBLY TUBE.
 (8)  
Tighten the retainer nuts for the metering valve equally on each side with the spanner wrench.

 S 394-031

 (9)  
Apply a fillet seal between the retainer nuts for the swivel valve and the actuator top trunnions.

 (10)
 Attach the metering valve to the bracket with the three bolts.

 (11)
 Install the brackets for the metering valve cover.

 S 434-032
 S 434-033
 

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 S 434-034
 (12)
 Connect the hydraulic lines for RETURN and SUPPLY to the metering valve. Tighten the connectors.

 S 494-035

 (13)
 Make sure the rig pins NS1 and NS2 are installed in the captain's forward quadrant and the interconnect mechanism (AMM 32-51-00/501).

 S 494-036

 (14)
 Install the rig pins NS3 in the input lever for the control valve and NS-5 in the input arm for the metering valve (Details A and B).

 S 434-037

 (15)
 Install and tighten the control cables NWSA and NWSB to the correct tension at the turnbuckles (AMM 32-51-00/501).

 S 494-038

 (16)
 Make sure the rig pins NS1 and NS2 can be easily installed.

 S 434-039

 (17)
 Install the turnbuckle lock clips.

 S 414-040

 (18)
 Install the access cover for the nose wheel well.

 S 434-041

 (19)
 Apply grease to the fastener and connect the input control rod to the input arm for the metering valve.

 (20)
 Tighten the fastener.

 S 824-043