(5)
Disconnect the drain line from the drain valve.
(6)
Remove the adapter connecting pin and the two washers.
S 034-006
S 034-007
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38-11-51
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
WATER TANK
ACCESS
PANEL
WATER TANK
DRAIN VALVE
SEE B
O-RING A
WATER TANK
TANK BOSS
JAMNUT
DRAIN VALVE ADAPTER
CLAMP ADAPTER MOUNTING
SCREW AND WASHER
SHAFT
COUPLING
ADAPTER SHROUD
CONNECTING
DRAIN PIN
LINE
VALVE ACTUATOR SHAFT
(SHOWN IN THE CLOSED
POSITION)
B
Water Tank Drain Valve Installation
Figure 401
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A 737-300/400/500MAINTENANCE MANUAL
S 034-027
(7)
Pull the valve actuator shaft handle on the water service panel to disconnect the shaft and the coupling from the adapter.
S 034-008
(8)
Remove the adapter mounting screw and washer.
S 034-028
(9)
Remove the adapter.
S 024-009
(10)
Loosen the jamnut and remove the drain valve.
S 034-010
(11)
Remove the O-ring and jamnut from the drain valve.
TASK 38-11-51-404-011
3. Drain Valve Installation (Fig. 401)
________________________
A. References
(1)
AMM 12-14-00/301, Passenger Water System
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 38-41-00/201, Water Tank Pressurization System
B. Access
(1) Location Zone
220 Aft Cargo Compartment Equipment Bay
C. Install the Drain Valve
S 434-012
(1)
Install the jamnut on the drain valve.
(2)
Install the O-ring in the groove on the drain valve.
(3)
Install the drain valve on the tank boss and tighten the jamnut.
S 434-013
S 424-014
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 434-015
(4)
Attach the adapter to the drain valve with the adapter mounting screw and washer.
S 434-016
(5)
Connect the shaft coupling to the adapter with the connecting pin and washers.
NOTE: Install the adapter connecting pin from the forward end
____ (valve closed), with the shaft handle in the closed position, as shown on Fig. 401.
S 434-017
(6)
Connect the drain line to the drain valve.
S 864-018
(7)
Fill the passenger water tank (AMM 12-14-00/301).
S 864-019
(8)
Supply electrical power (AMM 24-22-00/201).
S 864-020
(9)
Pressurize the water tank and remove the placards if they were installed when the pressure was released (AMM 38-41-00/201).
S 864-021
(10)
Let 2 minutes occur for the pressure to become stable.
S 794-022
(11)
Open the drain valve until the water starts to flow, then close the drain valve.
S 794-023
(12)
Examine the drain valve for leaks.
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