TM 10-4610-237-12 CHAPTER 4 UNIT MAINTENANCE INSTRUCTIONS Section I. Lubrication Instructions ................................................................................................................ 4-1 Section II. Repair Parts and Special Tools List.............................................................................................. 4-2 4.1 Common Tools and Equipment ........................................................................................................ 4-2 4.2 Special Tools, TMDE and Support Equipment.................................................................................. 4-2 4.3 Repair Parts ..................................................................................................................................... 4-2 Section III. Service Upon Receipt .................................................................................................................... 4-2 4.4 Siting ................................................................... ........................................................................... 4-2 4.5 Shelter Requirements ...................................................................................................................... 4-2 4.6 Checking Unpacked Equipment ....................................................................................................... 4-2 Section IV. Unit Troubleshooting Procedures  ................................................................................................ 4-5 4.7 Introduction ...................................................................................................................................... 4-5 4.8 Troubleshooting ............................................................................................................................... 4-5 4.9 Malfunction Index and Logic Trees................................................................................................... 4-6 Section V. Unit Maintenance Procedures ....................................................................................................... 4-17 4.10 General ............................................................................................................................................ 4-17 4.11 Personal Safety................................................................................................................................ 4-17 4.12 Proper Equipment ............................................................................................................................ 4-17 4.13 Hose Nozzle Kit Maintenance........................................................................................................... 4-17 4.14 Distribution Nozzle Assembly (1 1/2-Inch) Repair ............................................................................. 4-18 4.15 Discharge and Suction Hose Assembly Repair ................................................................................. 4-23 4.16 Gate Valve Assembly (2-Inch) Repair .............................................................................................. 4-28 4.17 Tee Assembly (9117-Y1) Repair....................................................................................................... 4-31 4.18 Nozzle Stand Assembly Repair ........................................................................................................ 4-35 4.19 2-Inch Hose Connection Kit Maintenance ......................................................................................... 4-37 4.20 125 GPM Pump Connection Kit Maintenance................................................................................... 4-37 4.21 Check Valve Assembly (2-Inch) Repair ............................................................................................ 4-37 4.22 Single Tank Connection Kit Maintenance ......................................................................................... 4-41 4.23 Tee and Dual Gate Valve Assembly (9148-Y1) Repair ..................................................................... 4-41 4.24 Gate Valve (4-Inch) Repair............................................................................................................... 4-46 4.25 Tee and Dual Gate Valve Assembly (9148-Y2) Repair ..................................................................... 4-49 Section VI. Preparation for Storage or Shipment............................................................................................ 4-54 4.26 Security Procedures ......................................................................................................................... 4-54 4.27 Administrative Storage ..................................................................................................................... 4-54 Section I.  LUBRICATION INSTRUCTIONS Lubrication of the 20K Water Storage and Distribution System is limited to the 125 gpm pump.  Refer to the applicable TM for lubrication requirements on the 125 gpm pumps. 4-1