TM 5-6115-590-12 CHAPTER 3 OPERATOR/CREW MAINTENANCE INSTRUCTIONS Section I.  Lubrication Instructions 3-1.  General Lubrication  of  the  power  plant  is  accomplished  by organizational personnel; however, the operator should  insure  that  the  oil  level  in  the  oil  tank  is adequate before operation of the power plant. Section II.  Preventive Maintenance Checks and Service 3-2.  General To  insure  that  the  power  plant  is  ready  for operation    at    all    times,    it    must    be    inspected systematically  so  that  defects  may  be  discovered and corrected before they result in serious damage or failure.  The necessary preventive maintenance checks and services are described in paragraph 3-3 and   table   3-1.      The   item   numbers   indicate   the sequence    of    minimum    inspection    requirements. Defects  discovered  during  operation  of  the  power unit   shall   be   noted   for   correction   as   soon   as operation has stopped.  Stop operation immediately if   a   deficiency   is   noted   during   operation   which would   damage   the   equipment   if   operation   were continued.  All deficiencies and short-comings shall be   recorded   together   with   the   corrective   action taken on from DA 2404 (Equipment Inspection and Maintenance Worksheet) at the earliest opportunity. 3-3.  Preventive Maintenance Checks and Services Preventive maintenance checks and services to  be  performed  by  the  operator/crew  are  listed  in table 3-1. 3-4.  Dual Water Hose Assembly Inspection. Inspect  dual  water  hose  assembly  (fig.  1-15, sheet 3 of 7) for damage, signs of leakage, stripped or  crossed  threads  on  coupling  nuts  and  electrical connectors, missing or damaged protective caps. 3-5.  Supply and Drain Water Hose Assembly Inspection. Inspect supply and drain water hose assembly for damage, signs of leakage, stripped or crossed   threads   on   coupling   nut   and   electrical connector,  missing  or  damaged  protective  caps  or lugs. 3-6.  External Fuel Filter. The  external  fuel  filter  is  a  vertical,  portable filter/separator    consisting    of    an    aluminum    tank mounted on an aluminum skid.  It is a static device which   is   installed   in   the   fuel   system   to   remove entrained water and solid contaminants in the fuel. Inlet,    outlet    and    water    drain    connections    are provided.      The   inlet   and   outlet   connections   are identical,   manually   operated   1   inch   ball   valves. The  water  drain  connection  is  a  1/2  inch  manually operated  ball  valve.    Quick  disconnect  couplings for  1  inch  hose  are  provided  at  the  fuel  inlet  and outlet connections.  A plexiglass  sight  gage  with  a ball float inside is mounted on the side of the tank to  indicate  the  water  level  in  the  tank  base.    The cover is held in place by four bolts and contains a manual  pressure  vent  valve  to  permit  bleeding  air from the unit. 3-7.  Maintenance of External Fuel Filter (fig.  3- 1). a.  Sight gage inspection. (1)    Inspect  sight  gage  for  cracked  body  or leaking around gasket. (2)  If malfunction exists, refer to organization maintenance. b.  Filter/Separator Assembly Inspection. (1)  Inspect skid and frame for bent or broken member, corrosion and general condition of paint. (2)    Refer  all  deficiencies  to  organizational maintenance. c.  Canister and Filter Element Inspection. (1)    Canister  and  filter  element  inspection  is required to maintain serviceability of the unit. (2)  Inspect the filter element for clogging or rupture.   Inspect   the   canister   for   a   damaged   or clogged screen. WARNING Depressurize  Filter/Separator  before  removing the   cover   assembly   by   opening   the   manual pressure   vent   valve   located   in   the   center   of cover. 3-1