(2)
Accomplish the following steps to drain the precharge:
(a)
Close the flapper valve.
(b)
Open the toilet tank drain valve.
(c)
After 5 minutes open the flapper valve to drain the precharge.
(d)
Disconnect the drain hose from the service panel.
(3)
Accomplish the following steps to gain access to the seals (Fig. 201, Sheet 1):
(a)
Remove the eight mounting screws.
(b)
Remove the retainer plate.
(c)
Install two mounting screws, but do not tighten the screws.
NOTE: This will keep the end nipple in position.
(d)
Remove the shaft retainers and the drive shaft assemblies.
(4)
To replace the seals, perform these steps (Fig.201, Sheet 1):
(a)
Remove and discard the seal on the drain cap.
(b)
Apply a thin layer of lubricant on the seal for the drain cap.
(c)
Install the seal for the drain cap.
CAUTION: USE A COTTON-TIPPED SWAB TO REMOVE THE O-RINGS IN THE DRIVE SHAFT CAVITIES. IF A COTTON-TIPPED SWAB IS NOT USED, YOU CAN CAUSE SCRATCHES ON THE SEALING SURFACE.
(d)
Use a lubricated cotton-tipped swab to replace the O-rings in the drive shaft cavities.
(e)
Remove the end nipple from the housing assembly.
NOTE: Note the orientation of the end nipple to help during the assembly.
(f)
Remove the seal retainer.
(g)
Remove and discard the molded seal in the housing assembly.
(h)
Apply a thin layer of lubricant to the surface of the molded seal and install the seal in the housing assembly.
(I)
Remove and discard the O-ring on the end nipple.
(j)
Apply a thin layer of lubricant to the surface of the O-ring and install the O-ring on the end nipple.
(k)
Install the seal retainer.
NOTE: Note the location of the drive shaft assemblies and orientation of the levers to help during the assembly.
509
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 38-32-81 Page 201
NOTE: Lubricate the seal retainer to keep it in the correct position.
(5) To assemble the drain valve, perform these steps (Fig. 201, Sheet 1):
(a)
Use a 1/8-inch hex drive to turn the flapper valve lock cam so that the cam pin will clear the tab in the housing assembly.
(b)
Close the flapper valve and set the lock cam against the flapper valve.
(c)
Ensure you align the scribe mark on the nipple with the scribe mark on the housing.
(d)
Install the end nipple.
(e)
Install the drive shaft assemblies and the shaft retainers.
(f)
Ensure the drive shafts are fully engaged.
(g)
Remove the mounting screws which were temporarily placed.
(h)
Install the retainer plate.
(I)
Install the mounting screws.
F. Return the Airplane Back to Its Usual Condition
(1)
Ensure the flapper valve is closed and then close the drain valve cap.
(2)
Accomplish the leak check for the service panel drain valve (AMM 38-32-0).
(3)
Add the chemical precharge to the waste tank and accomplish the remaining steps of the toilet servicing procedure (AMM 12-17-0).
509
38-32-81 Page 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
H75097 H75180 H75154
509 Service Panel Drain Valve Assembly
May 01/99 Figure 201 (Sheet 1) 38-32-81
Page 203
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Drain Valve Assembly 509
38-32-81 Figure 201 (Sheet 2) May 01/99
Page 204
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
509 Aft Drain Valve Assembly
May 01/99 Figure 201 (Sheet 3) 38-32-81
Page 205
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Drain Valve Seal Replacement – Forward and Aft Service Panels
A. Consumable Materials
(1) D00504, VV-P-236 Lubricant
B. References
(1)
AMM 12-17-0, Toilet – Servicing
(2)
AMM 38-32-0, Toilet System – Adjustment/Test
C. Access
(1)
Location Zones
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