(a)
Disconnect the hydraulic hoses from the valve.
(b)
Install caps on the hydraulic hoses.
S 864-004
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747-400 MAINTENANCE MANUAL
SEE A
2. SEQUENCE
1. VALVE ATTACH
VALVE
BOLT (2 LOCATIONS)
3. VALVE ATTACH
INT BOLT (1 LOCATION) OPEN
UP
DN
RET
RIGGING PIN
4.
STRIKER ARM
5.
BOLTS (4 LOCATIONS)
UPPER JURY STRUT 2. SEQUENCE
7. LEVER ASSEMBLY VALVE
SEE B
KEEL
6. STRIKER ARM
BEAM PLATES
8. BOLT
RIGGING PIN
A
HOLES
9.
CLEVIS ASSEMBLY
10.
BOLT
14. BOLT
11. LINK
7. LEVER
13. LEVER ATTACH BOLT
12. ROLLER
B
Body Landing Gear Downlock-Operated Sequence Valve and Mechanism Installation Figure 401
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747-400 MAINTENANCE MANUAL
(c) Remove the three attach bolts (1 and 3).
NOTE: Hold the valve body against the valve spring pressure
____ when you remove the bolts. This will permit the bolts to move freely.
(d)
Remove the valve and the lever mechanism.
(e)
Remove the bolts (10 and 14).
(f)
Remove the clevis (9), the lever (7), and the link (11).
(g)
Remove the hydraulic fittings from the valve.
(h)
Install the plugs on the valve ports.
TASK 32-33-04-404-006
3. Body Landing Gear Downlock-Operated Sequence Valve Installation
_______________________________________________________________
A. Special Tools and Equipment
(1)
G12001 Kit (Rigging Pins) ~................................................................ | Rigging Pin No. | Length (inch) | Diameter (inch) | .................................................................. | BD-3 | 3.25 | 0.185 to 0.188 | .................................................................. | BD-4 | 3.25 | 0.185 to 0.188 | 2....................….....................….....................1
B.
Consumable Materials
(1)
D00288 Lubricant - MCS 352 (Skydrol Assembly Lube)
C.
References
(1)
09-11-00/201, Towing
(2)
29-11-00/201, Main Hydraulic Supply System
(3)
32-00-30/201, Landing Gear Door Locks
(4)
IPC 32-33-04 Fig. 2
D.
Access
(1)
Location Zone
755 Body Landing Gear, LH
765 Body Landing Gear, RH
E.
Procedure
S 434-034
(1)
Install the hydraulic fittings in the sequence valve (Fig. 401):
(a)
Lubricate the O-rings, the backup rings and the fittings with the Skydrol Assembly Lube.
(b)
Install the hydraulic fittings with new O-rings and backup rings in the ports of the sequence valve.
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747-400
MAINTENANCE MANUAL
S 424-035
(2)
Install the sequence valve (Fig. 401):
(a)
Connect the clevis (9) to the valve with the four bolts (14) and the thin washers adjacent to the bolt heads.
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