TM 9-4940-342-14&P clockwise  rotation.  Should  a  fitting  be  removed  for inspection a sealant must be used when installation is performed. 4-11.  Tightening Hose Spud Clamps (Refer to Fig C-1) a.  At the first signs of leaking hoses, loose spuds, and  clamps,  the  steam  cleaner  operation  should  be discontinued and repairs made. b.  Fittings   should   be   inspected   for   cracks   and hose ends inspected for any concealed damage when coupled.   Always   tighten   two   bolt   clamps   evenly, securing alternately until tight. 4-12.  Pressure and Temperature Gage Repair (Refer to Fig 2-1) a.  Cracked,   leaking   or   inaccurate   pressure   or temperature   on   a   gage   is   cause   for   replacement. These    gages    are    factory    calibrated    and    field adjustment cannot be accomplished. b.  Remove   gage   by   disconnecting   copper   tube line, three screws, washers and nuts fastening gage to panel. Remove gage snubber from defective gage and install on replacement gage. Reinstall gage on panel and secure with screws. Replace copper tube line. 4-13.  Hose Assemblies Repair (Refer to Fig C-1) Hose  assemblies  cannot  be  repaired,  if  inspection reveals leaks. Hose must be replaced immediately. If leaks  appear  around  the  coupling  area  inspect  and tighten per instructions in paragraph 4-10. NOTE The  cleaner  gun  and  nozzles  are  a  most  important component  of  the  cleaner  and  a  damaged  or  leaky gun, a frozen swivel, improper nozzle and/or nozzle restriction 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. 4-14.  Gun Assembly Repair (Refer to Figs C-1 and C-2) NOTE Gun   assemblies   can   be   cleaned   and   repaired   to extent of component replacement and swivel repairs. Repair   gun   and   nozzles   with   unit   in   the   OFF position. a.  To clean guns (refer to fig C-2), remove nozzle, turn  on  cleaner  and  flush  gun  for  a  few  minutes. Check  nozzle  for  condition  and  nozzle  orifice  for proper restriction size. b.  Tighten  leaky  swivel  glands  (refer  to  fig  C-3) by   tightening   packing   gland   nut   until   a   slight drag  is  felt  when  rotating  gun  grip  extension  or,  if leaking, until leaking ceases. c.  Swivel repair (refer to fig C-3) is accomplished by    replacing    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 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 slight drag is felt when rotating gun grip extension or, if leaking, until leaking ceases. 4-15.  Water Tank Assembly (Refer to Fig C-6) The  water  tank  assembly  can  be  repaired  by  using standard  procedures  to  seal  any  leaks.  Float  valve, rod, ball and inlet connectors are removable and must be sealed if removed or replaced. 4-16.  Water Pump Crankcase Oil (Refer to Fig C-7) a.  The water pump assembly should be filled with S.  A.  E.  20  non-detergent  oil  and  drained  after  the first  100  hours.  Following  the  first  100  hours  of operation drain each 750 hours thereafter of recorded operation. b.  To  drain  oil,  remove  drain  plug  located  under pump  which  is  accessible  through  pump  and  motor mounting plate. When oil flow ceases reinstall plug, secure and inspect for leaks. 4-17.  Blower and Fuel Pump Belt Tension (Refer to Fig C-7) a.  The fuel pump is mounted on a slotted base and need  not  be  removed  for  belt  adjustment.  As  the blower and fuel pump are driven by one common V- belt, only one adjustment is required. b.  To check belt tension proceed as follows: (1)  Turn off main power supply to unit. (2)  Remove  rear  access  panel  by  removing  the four fastening screws. (3)  Loosen  the  two  bolts  and  nuts  supporting fuel pump to mounting base. (4)  Apply  tension  to  fuel  pump  (towards  back of   unit)   until   desired   tension   is   achieved.   Proper tension of belt may be verified by twisting belt ½ to ¾ turn in either direction. CAUTION Do  not  over  tighten  belt  as  premature  pump  and blower failure may occur. 19