TM 10-3930-669-34 Section IV.  MAINTENANCE PROCEDURES 2-13.  MAINTENANCE INTRODUCTION. This   section   provides   general   maintenance   procedures   for   Direct/General   Support   Maintenance   as   specified   in   the Maintenance Allocation Chart (MAC).  When a special procedure is necessary, the detailed procedure will be in the section covering that component. 2-14.  GROUND HANDLING. For Ground Handling information refer to TM 10-3930-669-10. 2-15.  GENERAL REMOVAL INSTRUCTIONS. a. Work  Required.    Remove  parts  for  repair  or  replacement  as  required.    Do  not  disassemble  a  component  any further than needed. b. Preparation.  Before removal of any electrical components, disconnect battery ground cable to ensure that circuits and  components  are  not  energized.    Before  removal  of  any  hydraulic  components,  relieve  hydraulic  system  pressure. Before removal of fasteners (nuts, screws), remove any paint on threads to ease removal and installation. c. Identification.    To  ease  assembly  and  installation,  tag  and  mark  shims,  connectors,  wires,  and  mating  ends  of lines before disconnecting them.  Identify similar parts to ensure correct assembly. d. Position  of  Valves.    Before  removing  valve  handles,  mark  or  diagram  their  positions  when  opened  or  closed. This will help during assembly. e. Tire Removal.  Before removing any tires, position wooden blocks under frame.  This will  secure  the  forklift  for safe tire removal. f. Location.  Before removing cable ties, cushioned clamps, hoses, tubing, wiring, etc., note the location, position, and routing to ensure correct assembly. 2-88