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Page Title: REPAIR
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TM 5-4210-220-12 4-18 PUMP, PIPING, AND VALVES - Continued 4-18.5 Water Tank Valve - Continued REPAIR Repair of the water tank valve consists of replacement of the major components These repairs may be carried out with the water tank valve mounted in the truck except as noted a Microswitch Repair (1) Tag and remove wiring to microswitch. (2) Remove   nuts   (1)   and   machine   screws   (2)   that   retain   the microswitch (3) to the microswitch bracket (4). (3) If microswitch bracket (4) is bent, or distorted remove the one remaining   screw   (5).      Remove   bracket   and   straighten   or replace. (4) Attach new microswitch bracket (4) using screw  (5).  Leave the other hole vacant for installation of the support clamp. (5) Aline new microswitch (3) with mounting bracket (4). (6) Install both machine screws (2) and nuts (1) and tighten firmly. (7) Install wiring to the microswitch (3). (8) Be sure cab lamp illuminates when valve is open.  Adjust microswitch if required. b. Shuttle Valve Repair (1) Tag and remove air lines (1) from shuttle valve (2) being replaced. (2) Remove both fittings (3) from shuttle valve (2). (3) Remove shuttle valve (2) from close nipple (4). (4) Inspect air lines (1) for crimps, or wear that may cause air leaks.  Repair or replace as necessary. (5) Inspect fittings (3 and 4) for stripped threads or distortion that may cause air leaks.  Replace if necessary. (6) Apply pipe sealant (item 22, Appendix  E) to threads and install  shuttle  valve  (2)  onto  close  nipple  (4).    Position valve in orientation shown. 4-230

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