TM   10-4610-241-24 TO  40W4-13-42 (e) Electric Wires and Connectors. Look for cracked, frayed, or broken insulation, bare wires, and loose or broken connectors. Tighten loose connectors. Report any damaged wires to your supervisor. (f) Hoses and Fluid Lines. Look for wear, damage, and leaks, and make sure clamps and fittings are tight. Wet spots show leaks, but a stain around a fitting or connector can also mean a leak.   If a leak comes from a loose fitting or connector,  tighten  it.   If  something  is  broken  or  worn  out,  replace  it  or  report  it  to  your  supervisor. c. CLEANING AGENTS CAUTION l DO  NOT  SMOKE  when  using  cleaning  solvent.  NEVER  USE  IT  NEAR  AN  OPEN  FLAME.  Be  sure there  is  a  fire  extinguisher  nearby  and  use  cleaning  solvent  only  in  well-ventilated  places.  Flash  point  of solvent  is  138°F  (60°C). l USE  CAUTION  when  using  cleaning  solvents.  Cleaning  solvents  evaporate  quickly  and  can  irritate exposed  skin  if  solvents  contact  shin.  In  cold  weather,  contact  of  exposed  skin  with  cleaning  solvents  can cause  frostbite. l Use  only  those  authorized  cleaning  solvents  or  agents  listed  in  Appendix  D. (1) Treating Mildewed Areas. Canvas that has mildewed can be cleaned by scrubbing with a dry brush. If it is necessary to use water to remove dirt, it should not be used until mildew has been removed. After removing mildew, examine fabric. Look for evidence of deterioration. If canvas has deteriorated, it should be replaced. (2) Cleaning Rust or Grease. When cleaning grease buildup or rusty places, use a cleaning solvent. Then apply a thin coat  of  light  oil  to  affected  area. d. LEAKAGE  DEFINITIONS  FOR  UNIT  PMCS.  Following  are  types/classes  of  leakage  a  maintainer  needs  to  know to be able to determine the status of the ROWPU.    Learn  these  leakage  definitions  and  remember  that  it  is  necessary  for  you to  know  how  fluid  leakage  affects  the  status  of  the  ROWPU. CLASS  I  -  Seepage  of  fluid  (as  indicated  by  wetness  of  discoloration)  not  great  enough  to  form  drops. CLASS  II  -  Leakage  of  fluid  great  enough  to  form  drops  but  not  enough  to  cause  drops  to  drip  from  item  being checked/inspected. CLASS  III  -  Leakage  of  fluid  great  enough  to  form  drops  that  fall  from  item  being  checked/inspected. Item No. 1 Interval Table 2-1. Unit Preventive Maintenance Checks and Services Location Item To Check/ Procedure Not  Fully  Mission Capable  If- a. Check Pump and Motor Pulleys for wear, cracks and damage. Service Semi-Annual RO Pump Assembly (Models   WPES-10 WPES-20   and Any pulley damaged or missing b. Check Drive Belt for cracking, fraying  or  breaks. Belt is brokencracked to the belt  fiber,  has  more  than  one crack (l/8 inch in depth or 50%  of  belt  thickness),  has brays  more  than  2  inches long  or  excessive  play (stretched) c. Check Belt adjustment for 1/2 inch  play d. Drain oil and check for metal particles  on  magnetic  plug  and milky condition. Replace oil as necessary,  check  that  filter  cover  is tight  and  breather  is  not  clogged WPES-30   only) I Cannot  be  adjusted Oil is milky or has metal particles.  Breather  is  un- serviceable 2-4  Change  1