4-18. PUMP, PIPING, AND VALVES - Continued
4-18.5 Water Tank Valve.
This task covers
Shop Equipment, Automotive
14, Appendix E Gasket Eliminator
Maintenance and Repair,
22, Appendix E Pipe Sealant
29, Appendix E Threadlock Liquid
112-B-02 Close Nipple
Water Tank Drained (see para. 2-11)
All Piping Drained
S125 Shuttle Valve
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
1512WM-5S Check Valve
Batteries Disconnected (see para. 4-24)
Pump Body and Hose Body Heat Shield Removed
(see para. 4-11)
Make sure the cab OPERATING MODE switch and
TANK VALVE switch are set to mid-position.
Make sure the structural panel TANK VALVE switch is
set to mid-position.
Tag and remove the four air lines (1) from the shuttle
Remove the wiring cover from the microswitch (2) Tag
and remove wires from terminals.
Remove microswitch wiring support clamp (10) by
removing microswitch mounting bracket screw (8).
Remove the four locknuts (3) and capscrews (4)
Separate pipe flanges (5 and 6) and lower the tank
valve assembly (7).
If a new valve is to be installed, make a sketch of all
the valve fittings and their location. Remove from the