(3)
The Inspection/Check procedures applicable to either forward or aft drain valve and its components are included in the Removal/Installation procedures because the only time the valve can be inspected is when it is removed from the toilet tank.
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TOILET DRAIN VALVE CONTROL CABLE - REMOVAL/INSTALLATION
1. General
A. Two removal/installation procedures are given. The first removes/installs the entire cable assembly, including the casing. The second removes/installs the cable without the casing, and is useful when only an inner cable has been broken or damaged.
B. Before performing maintenance, drain and flush toilet tank (Ref 12-17-0).
2. Remove Cable with Casing (Fig. 401)
A. For forward lavatory:
(1)
Remove fasteners and remove toilet tank shroud.
(2)
Disengage drain valve control cable at cable quick-disconnect.
(3)
Remove control cable pin and tee handle on toilet service panel.
(4)
Remove hexnut, tab washer and rubber seal from top side of cable sleeve subassembly mounted next to tank in floor panel.
(5)
Remove nose wheel access panels 3105 and /or 3106 (Ref 12-31-11) as necessary to gain access to control cable below passenger cabin floor.
(6)
Remove all clamps.
(7)
Disconnect slider housing and casing and cable assembly at hexnut.
(8)
Pull casing and cable assembly out of lavatory floor panel and slider housing.
NOTE: Assist cable through pulley assembly as necessary.
B. For aft lavatory:
(1)
Repeat steps 2.A.(1), 2.A.(2) and 2.A.(3).
(2)
In aft lavatory without catch basin, remove hexnut, tab washer and rubber seal from top side of cable sleeve subassembly (mounted adjacent to tank in floor panel).
(3)
In aft lavatory with catch basin, loosen grommet from sealant and push through floor panel. Discard grommet if damaged.
(4)
Remove aft cargo compartment aft bulkhead access panels as necessary to gain access to control cable below passenger cabin floor.
(5)
Remove all clamps.
(6)
Disconnect slider housing and casing and cable assembly at hexnut.
(7)
Under aft lavatory with catch basin, remove hexnut, tab washer and rubber seal from top side of cable sleeve subassembly mounted under lavatory floor panel.
(8)
Pull casing and cable assembly out of lavatory floor panel, mounting bracket if installed, and slider housing.
NOTE: Assist cable through pulley assembly as necessary.
3. Install Cable with Casing (Fig. 401)
A. Equipment and Materials
(1) Sealant - BMS 5-108, Type 1, Class B-2 (Ref 20-30-11)
B. Insert lavatory end of casing and cable assembly into lavatory compartment through mounting bracket and/or floor panel.
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C. Under aft lavatory with catch basin:
(1)
Spread slit in grommet and insert cable.
(2)
Apply sealant (Ref 20-30-11) and push grommet up through lavatory floor panel until grommet is in place.
D. Align cable through pulley to drain control valve.
E. Install nut, washer and seal on top side of cable sleeve subassembly.
F. Insert service panel end of casing and cable assembly into slider housing.
G. Connect slider housing and casing and cable assembly with hexnut.
H. Install clamps.
I. Install tee handle and pin on toilet service panel.
J. Engage drain valve control cable at cable quick-disconnect.
NOTE: With drain valve closed check that there is a 1/2-inch cable movement, with a cable load of approximately 5 pounds, before the valve starts to open.
K. Check that drain valve operates correctly.
L. Replace toilet tank shroud.
M. Replace access panel.
4. Remove Cable without Casing (Fig. 401)
A. Remove Cable
(1)
Remove fasteners and remove toilet tank shroud.
(2)
Disengage cable at quick-disconnect on toilet tank.
(3)
Remove clamps as necessary and relieve or remove all casing bend radii of 10 inches or less.
(4)
If cable is broken at control panel, proceed as follows:
(a)
Obtain access to inner side of panel by removing insulation as necessary (Ref 25-21-51 or 25-52-141).
(b) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 WATER AND WASTE(32)
