TM 9-4940-342-14&P Table 3-1.  Operational Preventive Maintenance Checks and Services - Continued B - Before operation  D - During operation  A - After operation Interval and Sequence no. Item to be inspected procedure Work time B D A (M  H) 20 Inspect oil cap assembly for open vent. 0.1 21 Inspect soap tank assembly, for leaks. 0.1 22 41 Inspect air dome outlet assembly for leaks. 0.1 23 Inspect blower wheel assembly for distortion and adjustment. 0.1 24 Inspect power cord for frays. 0.1 25 Inspect switch assembly for tightness of electrical connections. 0.1 26 42 Inspect fuel filter for cleanliness and leaks. 0.1 27 Inspect filter drain assembly for leaks. 0.1 28 43 Inspect soap tank overflow assembly for leaks. 0.1 29 Check all unit hardware for tightness. 0.3 30 44 Check all tubing assemblies for tightness and leaks. 0.1 3-4. Daily/ Weekly Preventive Maintenance Services Table 3-2 contains a listing of preventive maintenance   services   which   must   be   performed by   operating   maintenance   personnel   at   daily   or weekly    intervals.    The    item    numbers    are    listed consecutively and indicate the sequence of minimum requirements. Table 3-2.  Daily/Weekly Preventive Maintenance Checks and Services D - Daily W - Weekly Interval and Sequence no. Item to be inspected procedure Work time D W (M H) 1 Blow-down unit. 0.2 2 Service the cleaning guns. 0.1 3-5. Servicing the Hose Assemblies Servicing   of   the   hose   assemblies   is   limited   to cleaning and removal of any foreign matter. 3-6.    Servicing the Cleaning Gun Assembly (Refer to Fig C-2) a.  The  cleaning  gun  is  composed  of  gun  handle, swivel  assembly,  gun  grip  extension  and  nozzles. Each nozzle has a nozzle restrictor. b.  The   cleaning   gun   and   nozzles   are   a   most important  component  of  the  cleaner.  A  damaged  or leaky   gun,   frozen   swivel,   improper   nozzle   and/or nozzle   restrictor   can   greatly   reduce   the   cleaning effectiveness    and    increase    the    physical    effort necessary   to   complete   any   cleaning   task.   As   an important   component   it   should   be   kept   in   prime condition at all times. c.  Keep    cleaning    gun    and    swivel    properly adjusted.  Replace  nozzles  and  nozzle  restrictors  if damaged or worn. (1)  To   clean   gun,   remove   nozzle,   turn   on cleaner   and   flush   gun   for   a   few   minutes.   Check nozzle  for  condition  and  nozzle  orifice  for  proper restrictor size. (2)  Tighten swivel packing glands by tightening packing  gland  nut  until  a  slight  drag  is  felt  when rotating   gun   grip   extension   or,   if   leaking,   until leaking ceases. d.  To   replace   packing   in   swivel   assembly,   the packing    glands    must    be    replaced    when    simple tightening of packing gland nut will not stop leaking without locking rotation. (1)  Unscrew packing gland cap and remove gun grip extension from gun handle. Pull out packing ring bushing and the three chevron packings from swivel body. (2)  Install  new  packings,  bushing  with  recess facing  collar  or  brass  swivel  bushing.  Reinsert  and screw on packing gland cap. (3)  Tighten   packing   gland   cap   until   a   slight drag  is  felt  when  rotating  gun  grip  extension  or,  if leaking, until leaking ceases. NOTE If any pipe fittings are broken or replaced including nozzles,    use    teflon    tape    on    all    threads    upon reassembly. 14