TM 10-3930-664-10 3-7. HYDRAULIC OIL SAMPLING VALVE - SERVICE This task covers: Obtaining a hydraulic oil sample for the Army Oil Analysis Program (AOAP). 1. CLEAN THE HYDRAULIC OIL SAMPLING VALVE (1). 2. START  THE  ENGINE,  PARAGRAPH  2-9.  BRING THE   HYDRAULIC   FLUID   TO   NORMAL   OPERATING TEMPERATURE    BY    ALTERNATELY    RAISING    AND LOWERING  THE  MAST  AND  SHIFTING  THE  FORKS TO THE LEFT AND RIGHT. 3. OBTAIN THE OIL SAMPLE. a. Remove the dust cap (2) on  the  hydraulic  oil sampling valve b. Place  a  clean  container  under  the  valve  (1) spout. c. Rotate    the    knob    (3)    clockwise    to    drain approximately  one  pint  (.47  liter)  of  oil  prior  to  taking  a sample. Release the knob (3) to close the valve (1). d. Place   a   sample   bottle   under   the   valve   (1) spout  and  fill  it  to  within  1/2  inch  (1.27  cm)  from  top. Release  the  knob  (3)  to  close  the  valve  (1).  Cap  the bottle immediately. e. Install  the  dust  cap  (2)  on  the  hydraulic  oil sampling  valve  (1).  Tighten  dust  cap  only  finger  tight. Return the oil drained into container during step c to the hydraulic tank. f. Check    hydraulic    oil    level    and    add    oil    if necessary. Refer to LO10-3930-554-12. 3-16