(a)
P7 Overhead Circuit Breaker Panel
1) 7J4 EDP SUPPLY 1
2) 7J5 EDP SUPPLY 2
3) 7J6 EDP SUPPLY 3
4) 7J7 EDP SUPPLY 4
S 014-006
(5) Open the pressure relief door on the forward upper midspar
(AMM 54-62-00/201).
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A
747-400 MAINTENANCE MANUAL
S 864-007
(6) Make sure the position indicator on the hydraulic shutoff valve (8) is in the OPEN position.
S 864-008
WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC RESERVOIR PRESSURE BEFORE
_______ YOU DRAIN THE RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
(7)
Operate the bleed valve on the reservoir pressurization module to release the pressure in the reservoir (AMM 29-11-00/201).
S 014-009
(8)
Open the right thrust reverser half (AMM 78-31-00/201).
S 684-032
(9)
Drain the hydraulic reservoir fluid:
(a)
Put the 10 gallon (40 liter) container below the EDP.
(b)
Disconnect the supply hose from the EDP.
NOTE: The supply hose is the largest hose.
____
(c)
Install the MS21902-20 union in the supply hose.
(d)
Drain the reservoir fluid into the container.
(e)
Remove the union from the supply hose.
(f)
Connect the supply hose to the EDP.
1) Tighten the hose connection to 855-945 pound-inches (95-105 N.m).
S 034-013
(10)
Remove the three piece clamp block assembly:
(a)
Remove the bolts (1) and the washers (2).
(b)
Remove the cap angle (3) and the block half (4).
(c)
Remove the spacers (5).
(d)
Remove the block halves (6 and 7).
S 024-015
(11)
Remove the hydraulic shutoff valve (8):
(a)
Disconnect the hydraulic shutoff valve (8).
(b)
Remove the bolts (9), the washers (11), and the nuts (12).
(c)
Remove the hydraulic shutoff valve (8) from between the adapter flanges (14).
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747-400 MAINTENANCE MANUAL
(d) Remove the packings (10) from the grooves in the inlet and outlet surfaces of the hydraulic shutoff valve (8). 1) Discard the packings.
S 434-016
(12) Install caps on the adapter flange (14) ports to prevent contamination.
TASK 29-11-04-404-017
3. Hydraulic Supply Shutoff Valve Installation (Fig. 401)
___________________________________________
A. Consumable Materials
(1) D00153 Fluid-Hydraulic, Fire-Resistant BMS 3-11
B. Parts Parts
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Bolt (Outboard) | 29-11-04 | 01 | 75 | | | 1 | Bolt (Inboard) | | 02 | 70 | | | 2 | Washer (Outboard) | | 01 | 80 | | | 2 | Washer (Inboard) | | 02 | 75 | | | 3 | Cap Angle (Outboard) | | 01 | 90 | | | 3 | Cap Angle (Inboard) | | 02 | 85 | | | 4 | Block Half (Outboard) | | 01 | 93 | | | 4 | Block Half (Inboard) | | 02 | 90 | | | 5 | Spacer (Outboard) | | 01 | 85 | | | 5 | Spacer (Inboard) | | 02 | 80 | | | 6 | Block Half (Outboard) | | 01 | 95 | | | 6 | Block Half (Inboard) | | 02 | 95 | | | 7 | Block Half (Outboard) | | 01 | 100 | | | 7 | Block Half (Inboard) | | 02 | 100 | | | 8 | Shutoff Valve (Hydraulic Supply) | | | | | | | (Outboard) | | 01 | 275 | | | 8 | (Inboard) | | 02 | 270 | | | 9 | Bolt (Outboard) | | 01 | 280 | | | 9 | Bolt (Inboard) | | 02 | 275 | | | 10 | Packing (Outboard) | | 01 | 300 | | | 10 | Packing (Inboard) | | 02 | 295 | | | 11 | Washer (Outboard) | | 01 | 285 | | | 11 | Washer (Inboard) | | 02 | 280 | | | 12 | Nut (Outboard) | | 01 | 290 | | | 12 | Nut (Inboard) | | 02 | 285 | 2......…........…...................................…..........….....….........1
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