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TM 10-3930-664-24 Section V.  UNIT TROUBLESHOOTING 2-12. GENERAL. a. This   section   contains   unit   maintenance   level   troubleshooting   information   for   identifying   and   correcting malfunctions  which  may  develop  during  forklift  operation.    Each  malfunction  or  trouble  symptom  is  addressed  and  is followed by a series of inspections or tests necessary to determine the probable cause and corrective action. b. The  Unit  Troubleshooting  Symptom  Index,  Table  2-2,  lists  the  common  malfunctions  which  may  occur.    It refers you to the proper page for troubleshooting procedures. c. This  manual  cannot  list  all  possible  malfunctions  that  may  occur,  all  tests  or  inspections  that  must  be performed, or  all  corrective  actions  for  each  malfunction.    If  a  malfunction  is  not  listed,  or  is  not  remedied  by  corrective actions, notify personnel at next highest maintenance level. d. Prior to using troubleshooting diagrams, be sure you have performed all normal operational checks.  Refer to the electrical schematic (Figure FO-2) and hydraulic flow diagram (Figure FO-1) to assist in troubleshooting. e. Never overlook the chance that the problem could be of simple origin.  The problem may be corrected with minor adjustments. f. Use  all  senses  to  observe  and  locate  troubles.    Use  test  instruments  or  gauges  to  help  isolate  problems. Always isolate the system where the trouble occurs, then locate the defective component. g. When troubleshooting a malfunction: (1) Question the operator to obtain any information that might help determine the cause of the malfunction. Before continuing, ensure that all applicable operator troubleshooting has been performed. (2) Locate  the  symptom  or  symptoms  in  Table  2-2  that  best  describe  the  malfunction.    If  the  appropriate symptom is not listed, notify your supervisor. (3) Turn to the page where the troubleshooting procedures for that malfunction are described. (4) Perform  each  step  in  order  until  the  malfunction  is  corrected.    Do  not  perform  any  maintenance  task unless the table directs you to do so. 2-9

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