F.
Procedure to Install the Main Gear Retract Actuator
32-32-01
ALL ú ú 01 Page 405 ú May 28/01
A
757
MAINTENANCE MANUAL
S 434-035
CAUTION: USE FIG. 401 TO MAKE SURE THE HYDRAULIC FITTING FOR THE DOWN
_______ LINE IS INSTALLED IN THE CORRECT DIRECTION ON THE ACTUATOR BEFORE YOU CONNECT THE HYDRAULIC LINE. IF THE FITTING IS NOT IN THE CORRECT DIRECTION, THE LINE CAN BE DAMAGED AND CAUSE LOSS OF HYDRAULIC FLUID.
(1) Connect the hydraulic lines to the actuator.
NOTE: The main landing gear retract actuators are built up for
____ specific positions (left or right side), the difference is the orientation of the down line fitting. If the correct position assembly is not available, you can change the orientation of the fitting such that you can use the actuator on the opposite side.
S 614-017
(2)
Fill the actuator and lines with hydraulic fluid. Install a plug in the lines.
S 494-018
(3)
Use the instructions supplied with the tool to install the hoist adapter onto the actuator, then attach to the hoist. Lift the actuator into position in the wing.
S 434-019
(4)
Do the steps that follow to connect the head end of the actuator to the yoke:
(a)
Install thread protector.
(b)
Put grease on pin (14) and install.
(c)
Install the tang washer (13) and the nut (10). Use a crowfoot wrench to tighten the nut (10) to 70-90 pound-feet (94.9-122.0 newton-meters). Loosen the nut (10), then tighten it again to 5-10 pound-feet (6.8-13.6 newton-meters). If it is necessary, loosen the nut (10) to the nearest possible lock position to install the antirotation bolt (9). It is acceptable to have a zero torque condition on the nut (10) when you install the antirotation bolt (9).
(d)
Install antirotation bolt (9), washer (11), nut (12), and cotter pin.
S 494-020
(5)
Use the instructions supplied with the tool to install the pump. Extend the actuator piston to align the rod end attach hole.
S 094-021
(6)
Remove the pump from the hydraulic lines. Install a plug in the lines.
32-32-01
ALL ú ú 01 Page 406 ú Jan 28/01
A
757
MAINTENANCE MANUAL
S 434-022
(7)
Do the steps that follow to connect the rod end of the actuator (2) to the shock strut (View A-A):
(a)
Install thread protector.
(b)
Put grease on pin (1).
(c)
Install the pin (1) and the spacers (3).
(d)
Install the tang washer (8) and the nut (5). Use a crowfoot wrench to tighten the nut (5) to 70-90 pound-feet (94.9-122.0 newton-meters). Loosen the nut (5), then tighten it again to 5-10 pound-feet (6.8-13.6 newton-meters). If it is necessary, loosen the nut (5) to the nearest possible lock position to install the antirotation bolt (4). It is acceptable to have a zero torque condition on the nut (5) when you install the antirotation bolt (4).
(e)
Install antirotation bolt (4), washer (6), nut (7), and cotter pin.
S 644-023
(8)
Lubricate the actuator at grease fittings.
S 864-024
(9)
Make sure pressure is removed from the left hydraulic system and hydraulic reservoir.
S 434-025
(10)
Connect the hydraulic lines to the bulkhead fittings.
S 214-026
WARNING: IF YOU DO NOT INSTALL THE HYDRAULIC LINES PROPERLY, THE LINES
_______ COULD RUB AGAINST THE MAIN LANDING GEAR. THIS COULD RESULT IN THE LOSS OF HYDRAULIC FLUID.
(11)
Make sure the hydraulic lines do not rub against the landing gear.
S 094-027
(12)
Remove the hoist adapter from the actuator.
S 714-028
(13)
Do a check of the actuator to be sure it is installed properly.
(a)
Pressurize the left hydraulic system.
(b)
Move the landing gear control lever from DN to UP several times. Return the lever to DN.
(c)
Visually inspect the actuator and hydraulic lines for hydraulic leaks.
(d)
Remove hydraulic power (AMM 29-11-00/201) if it is not necessary.
32-32-01 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(47)
