TM 10-3930-671-24 3. Test the neutral start switch. a) Apply parking brake. b) Put direction control in neutral (N). c) Turn   key   switch   momentarily   to   START position. Check if engine starter operates. Turn key switch OFF. d) Move direction control lever to FORWARD position. Repeat Step 3. e) Move control to REVERSE position. Repeat Step 3. The   engine   starter   should   operate   only   with   direction control in NEUTRAL  (N)  position.  If  the  starter  operates in FORWARD or REVERSE position, a) the neutral start switch  has  a  fault,  or  b)  transmission  shift  linkage  may require adjustment. 4. Test the anti-restart feature of the key switch. a) Start engine. b) Attempt to restart engine. c) Switch should not allow restart. 5. Check fuel level and that fuel gauge is operating. 6. Test the warning indicator lights. To Check: • From   OFF   position,   turn   key   switch   to RUN   position   to   check   AMMETER   and ENG OIL PRESS indicator lights. • Turn   key   switch   to   START   position   to check   WATER   TEMP   and   TRANS   OIL TEMP indicator lights. Hourmeter 1.    Start the engine. 2.    Check   hourmeter   for   operation,   with   engine running.  The  hourmeter  is  controlled  by  engine oil pressure. It operates only when the engine is running.   Report   any   malfunction   or   damage. Write   the   hourmeter   reading   on   PM   report form. Refer to Operator’s Manual  for  additional  information  on how your truck operates. Engine 1.    Test engine starting and operating condition. If   there   are   engine   starting   and   operating   problems, please refer to Part 4, Engine. 2.    Test the engine exhaust system and muffler for excessive  noise  level  and  leakage.  Accelerate the  engine  several   times.   Check   the   exhaust coming from the tail pipe. The exhaust should be invisible  or  clear  (colorless).  A  stream  of  black smoke  generally  indicates  a  mixture  that  is  too rich  (excessive  fuel  consumption).  A  stream  of blue   smoke   generally   indicates   excessive   oil consumption. 3.    Test the engine idle speed and no-load governed speed   adjustment.   Check   for   obvious   engine overspeeding   due   to   faulty   engine   governor operation. 4.    Listen for misfiring, excessive valve tappet noise, and any unusual engine noise--engine *knocking,"   etc.   Also,   listen   for   any   unusual noise from  the  transmission,  charging  pump,  or main hydraulic pump. 5.    If  necessary,  perform  a  stall  test  to  determine engine performance. Refer to Section 4. 7, RPM, Vacuum & Stall Tests. F-46