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Section II.  EQUIPMENT DESCRIPTION
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TM-9-5130-338-12P Forward Repair System (FRS) Model M7 Manual
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b. The resistive force
TM 9-5130-338-12&P 1-9.  LOCATION AND DESCRIPTION OF MAJOR COMPONENTS. The   hydraulic   impact   wrench   is   designed   primarily   for   heavy-duty   disassembly   and   assembly   tasks   where   torque requirements  are  maximum  and  available  power  resources  are  minimal.    The  impact  wrench  consists  of  two  major assemblies:  the  impact  head  and  the  motor  unit.    The  impact  head  is  located  in  a  die-cast  housing  constructed  of  an aluminum  alloy  or  press-formed  steel.    The  motor  unit  contains  connections  for  two  hydraulic  hose  lines,  handle,  and trigger.  It provides a 3/4-in.-square drive for the attachment of heavy-duty sockets. 1-10.  EQUIPMENT DATA. Manufacturer  ................................................................................................................ Stanley Hydraulic Tools Operating pressure  ........................................................................................2000 pounds per square inch (psi) (maximum permissible) ........................................................................................ (13,790 kilopascals [kPa]) Fluid flow (minimum)  .......................................................................... 2.0 gallons per minute (gpm) @ 1400 psi .......................................................................................................(7.6 liters per minute (Ipm) @ 9653 kPa) Fluid flow (maximum) ......................................................................5.0 gpm © 1400 psi (18.9 Ipm @ 9653 kPa) Wrench speed (maximum permissible) ......................................................2000     revolutions per minute (rpm) Minimum torque output ......................................................... 50 pound-feet (lb-ft) (67.8 Newton-meters [Nom] ) Ambient operating temperature ........................................................25 degrees Fahrenheit (OF) (-31.7 degrees (with proper oil viscosity) ............................................................................. Celsius [oC] ) to 115oF (46.1 oC) Ambient storage (with proper oil viscosity)  ......................................................-65oF (-53.9oC) to 155oF (68.4oC) Operating oil .......................................................................................................................OE/HD-10, PE 10-1, OHA, and OES Weight with hoses and preservative oil ....................................................... 30 pounds (lb) (13.6 kilograms [kg]) Section III.  PRINCIPLES OF OPERATION 1-11.  MOTOR UNIT. a. Pressure on the on/off trigger (1) permits the flow of fluid from the high-pressure inlet line (2) through the motor unit  (3).    The  fluid  pressure  forces  the  gears  (4  and  5)  to  rotate,  providing  clockwise  or  counterclockwise operation of the hydraulic impact wrench, as controlled with the selector switch (6). b. As gear rotation continues, a quantity of fluid is displaced and carried to the opposite side of the motor unit (3), where it is exhausted to the outlet return line (7).  The rotation of gears (4 and 5) causes rotation of the assembly shaft (8), which engages the upper end of the hammer (9), which in turn drives the anvil (10). 1-12.  IMPACTING UNIT. a. At this point, the restrictive force of the object being tightened or loosened triggers the hydraulic impact function of the wrench.  The anvil (10) engages the hammer assembly (9) and the energy stored in the hammer assembly is transmitted to the anvil, delivering an impact force to the object being turned. 1-4

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