MAIN GEAR TRUCK POSITIONER ACTUATOR
Hydraulic Flow Fuse Reset
Figure 203
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S 862-004
(3)
Remove the pressure from the left hydraulic system and hydraulic reservoir (AMM 29-11-00/201).
D.
Remove the Fuse (Option 1)
S 032-005
(1)
Disconnect the hydraulic line from the fuse port.
S 432-006
(2)
Install a plug in the line and the fitting.
S 022-007
(3)
Remove the fuse from the shuttle valve module.
NOTE: It may be necessary to remove sealant from around the edge of
____ the fuse and the shuttle valve module to loosen the fuse.
E. Remove the Fuse (Option 2)
S 022-025
(1) Remove the truck positioner shuttle valve for the main landing gear (AMM 32-32-17/401).
TASK 32-32-19-402-054
3. Install the Hydraulic Fuse from the Truck Positioner Shuttle Valve (Fig. 201)__________________________________________________________________
NOTE:____There are two options to install the fuse. Use Option 1 if you removed the fuse from the shuttle valve module. Use Option 2 if you removed the fuse with the shuttle valve module as a unit.
A. Equipment
(1) Hydraulic Service Cart, 0 to 3000 psi, with
hydraulic fluid, fire resistant, BMS 3-11 (for
fuse removal, option 1)
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B. Consumable Materials
(1)
D00153 Hydraulic Fluid, Fire Resistant - BMS 3-11
(2)
A00247 Sealant - BMS 5-95
C.
References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 24-22-00/201, Electrical Power Control
(3)
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems
(4)
AMM 32-00-15/201, Landing Gear Door Locks
(5)
AMM 32-32-17/401, Main Gear Truck Positioner Shuttle Valve
D.
Access
(1)
Location Zones
551 Wing Trailing Edge (Left)
651 Wing Trailing Edge (Right)
E.
Install the Fuse (Option 1)
S 642-008
(1)
Lightly lubricate the rings and packing with hydraulic fluid.
S 432-009
(2)
Install the rings and packing on the fuse.
S 422-010
(3)
Install the fuse in the shuttle valve module. Tighten to 120-160 pound-inches.
S 432-011
(4)
Apply sealant around the edge of the fuse and the shuttle valve module.
S 432-012
(5)
Install lockwire between the fuse and the shuttle valve module.
F.
With the hydraulic line to the fuse port disconnected, do the steps that follow to make sure the fuse operates correctly:
S 212-013
(1) Make sure the control lever for the landing gear on the P3 panel is in the DN position.
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S 492-014
(2)
Put a container at the fuse port to catch hydraulic fluid. Fluid will flow from the fuse port when the hydraulic system is pressurized.
S 862-057
(3)
Supply 25 psi to the left hydraulic system with a hydraulic ground cart (AMM 29-11-00/201).
S 712-015
WARNING: KEEP PERSONS CLEAR OF THE OPEN FUSE PORT WHILE THE HYDRAULIC
_______ LINE IS DISCONNECTED FROM THE PORT AND THE LEFT HYDRAULIC SYSTEM IS PRESSURIZED. HIGH PRESSURE HYDRAULIC FLUID CAN CAUSE INJURY TO PERSONS.
(4)
When the fuse closes, increase the applied pressure to 3000 psi and hold it for 5 minutes.
S 712-016
(5)
Make sure that leakage from the fuse port is not more than one drop per minute for the last 3 minutes.
S 862-017
(6)
Remove the power from the left hydraulic system (AMM 29-11-00/201).
G.
Continue to Install the Fuse (Option 1)
S 642-018
(1)
Lightly lubricate the O-ring with hydraulic fluid.
