(1) Remove the hydraulic pressure tube and the hydraulic return tube of
the compressor stator with the steps that follow:
(a)
Disconnect the hydraulic pressure tube at the two ends.
(b)
Disconnect the hydraulic return tube at the two ends.
(c)
Loosen the two clamp bolts.
(d)
Move the tubes away from the actuator adapters.
(e)
Install the protection covers.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 485-121-N00
(2)
Connect the hydraulic cart with the steps that follow:
(a)
Install the tool adapter (PWA 29451) to the actuator adapter in the PF port.
(b)
While you hold the actuator adapter, tighten the tool adapter to 225-250 pound-inches (25.4-28.2 newton-meters).
(c)
Install the hydraulic pressure hose (A) to the tool adapter.
NOTE: If it is necessary, use a standard 45 degree or 90
____ degree adapter or elbow on the end of the hose.
(d)
Install the hydraulic return hose (B) to the tool adapter in the PFR port.
(e)
While you hold the tool adapters, tighten the nuts on the hoses (A and B) to 200-225 pound-inches (22.6-25.4 newton-meters).
(f)
Remove the hose attached to the top of the pump reservoir.
(g)
Examine the level of the fluid in the pump reservoir.
(h)
Fill the pump reservoir to the top of the pump reservoir.
(i)
Install a cap to the end of the hose attached to the top of the pump reservoir.
NOTE: This hose is not used on the PW4000 engine.
____
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(3)
If you use the electrical switch box, connect the electrical switch box with the steps that follow:
(a)
Disconnect the W4P3 and the W5P7 harness connectors from the actuator. 1) Install protection covers to the connectors.
S 825-090-N00
(4)
Do the initial adjustment of the rod end bearing:
(a)
Tighten the rod end bearing until the flat surface below the hexagonal is approximately 9/16 inch (14.3 mm) from the flat surface below the actuator rod threads (Fig. 502).
NOTE: Do this with no hydraulic pressure to the PF port on the
____ actuator. This is only the approximate initial adjustment.
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(5) Operate the hydraulic cart to fully extend the actuator rod (vanes open):
(a)
Prepare the hydraulic cart with the steps that follow: 1) Put the control handle to the neutral position (center). 2) Turn the hydraulic valve handle to the closed postion
(perpendicular to the flow). 3) Turn the valve handle for the air supply to the closed postion (perpendicular to the flow). 4) Turn the smaller adjustment knob clockwise until it stops.
(b)
Connect the air source to the air inlet.
(c)
Turn the handle for the air supply valve to the open position (parallel with the flow).
(d)
Lift and turn the larger adjustment knob clockwise to increase the air pressure to 25-30 psi.
NOTE: The pump ratio is 1 to 10 (30 psi air is the same as 300
____
psi hydraulic).
(e)
Turn the hydraulic valve handle to the open position (parallel to the flow).
(f)
Slowly turn the smaller adjustment knob counterclockwise until the air motor turns.
NOTE: The smaller adjustment knob controls the speed of the
____ actuator and the time necessary for the pressure to come back after the actuator operation.
With the control valve in the neutral position, hydraulic pressure on the gage will be 0 psi.
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本文链接地址：747-400 AMM 飞机维护手册 大气 AIR 2(35)
