TM 55-4920-328-13 m.      Install   suitable   size   polyethylene   plugs   in   the manual drain valve ports in the fuel tank assembly (1). WARNING Observe    all    base    safety    and    fire regulations pertaining to the handling    of    toxic    and    flammable liquids.        Failure    to    observe    this warning may result in serious or fatal Injury. n.  Disconnect the inlet hose from the gasoline engine fuel  pump  on  the  hydraulic  start  unit  (figure  1-8)  and drain all gasoline from the fuel tank on the unit. o.      Purge   the   gasoline   tank   in   the   hydraulic   start system,  then  reconnect  the  inlet  hose  to  the  fuel  pump on the gasoline engine. WARNING Observe all safety regulations pertaining   to   the   handling   of   toxic turbine   lubricating   oils.      Failure   to observe  this  warning  may  result  In extreme   skin   irritation   and   adverse effect on health. p.  Open the fill cap, vent, and strainer (15, figure 1- 12)  on  the  lubricating  oil  unit  (6)  of  the  test  trailer  oil system. q.      Connect   the   oil   supply   hose   from   an   engine accessories kit to the OIL SUPPLY quick-disconnect on the  test  trailer.    Insert  the  open  end  of  the  oil  supply hose into a container of suitable capacity. r.    Energize  the  OIL  PUMP  circuit  breaker  CB3  (14, figure 2-9). s.  Energize the OIL PUMP START switch (15, figure 1-26)  and  allow  the  test  trailer  oil  system  to  drain  the tank  of  the  lubricating  oil  unit  (6,  figure  1-12)  into  the container.    Depress  the  OIL  PUMP  STOP  switch  (23, figure  1-26)  when  the  tank  is  approximately  two-thirds empty. t.  Deenergize the OIL PUMP circuit breaker CB3 (14, figure 2-9). u.      Disconnect   the   oil   supply   hose,   remove   the container, and install the fill cap, vent, and strainer (15, figure 1-12). v.  Remove the cap (34, figure 7-9) from the OIL OUT bulkhead union (32) on the portable oil unit. w.    Attach  a  drain  hose  of  suitable  length  at  the  OIL OUT bulkhead union and place the free end of the hose in a suitable container. x.  Energize the LUBE PUMP circuit breaker CB6 (2, figure 2-9). y.      Energize   the   LUBE   PUMP   START   switch   (13, figure 1-26) and drain the oil from the portable oil unit, using  system  power.    When  all  but  approximately  two gallons  of  the  oil  is  drained  from  the  unit,  depress  the LUBE PUMP STOP switch (25) to stop the pump. z.  Detach the Hose from the OIL OUT bulkhead unit (32,  figure  7-9),  install  the  cap  (34),  and  remove  the container of oil. aa.  Deenergize the LUBE PUMP circuit breaker CB6 (2, figure 2-9). ab.    Detach  the  water  supply  hose  from  the  water brake  water  supply  port  (13,  figure  1-16)  on  the  test trailer.  (The water may be drained by gravity flow or by use of the water brake supply pump.) ac.      If   it   is   desired   to   pump   the   tanks   completely empty,  energize  the  BRAKE  PUMP  START  switch  (8, figure 1-26) and the COOLING PUMP START switch (9) to allow the system pumps to exhaust the water from the auxiliary trailer water system. ad.  When the flow of water has ceased, depress the BRAKE  PUMP  STOP  switch  (30)  and  the  COOLING PUMP STOP switch (29). ae.  Remove the plug upstream from the temperature regulating valve and probe (9, figure 1-12) and allow the entrapped  water  to  drain  from  the  system,  then  install the plug and tighten securely. af.  Remove the plug in the heat exchanger (13) and allow the entrapped water to drain from the system, then install the plug and tighten securely. ag.    Remove  the  plug  in  the  strainer  (2,  figure  1-16) and allow the entrapped water to drain from the system, then install the plug and tighten securely. ah.    Open  the  valve  (15)  and  remove  the  dust  cap (12).      Allow   the   entrapped   water   to   drain   from   the system, then install the dust cap. ai.      Detach   the   water   supply   hose   from   the   water brake water supply port (1, figure 1-34) on the auxiliary trailer. 4-2