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Table 4-1.  UNIT MAINTENANCE PMCS
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TM-9-5130-338-12P Forward Repair System (FRS) Model M7 Manual
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UNIT MAINTENANCE TROUBLESHOOTING-Continued
TM 9-5130-338-12&P Table 4-2.  UNIT MAINTENANCE TROUBLESHOOTING. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. Hydraulic Impact Wrench Fails to Operate. Step 1-Refer to applicable vehicle manual and ensure that vehicle is properly set up for hydraulic impact wrench operation. Step 2-Inspect wrench hydraulic hose couplings to ensure they are properly connected and free of restrictions. Remove  all  restrictions  from  hose  couplings.    If  restriction  cannot  be  removed,  replace hose couplings (refer to applicable vehicle manual).  Ensure hose couplings are properly connected. Step 3-Inspect hydraulic hoses for restriction or damage that would stop oil flow. Repair or replace restricted or damaged hydraulic hoses (refer to applicable vehicle manual). Step 4-Check that rotation direction selector control is properly set for desired rotation. Set selector control fully in desired rotation direction. Step 5-With all of above checks performed, attempt to operate hydraulic impact wrench. If hydraulic impact wrench fails to operate, repair hydraulic impact wrench (see para. 4-17). 2.  Hydraulic Impact Wrench Fails to Develop Full Power. Step 1-Refer to applicable vehicle manual and ensure controls are set to deliver sufficient oil for desired torque requirement. Set vehicle controls to provide sufficient oil flow for torque requirement. Step 2-Check that rotation direction selector control is set fully in position for desired rotation. Set rotation direction selector control fully in position for desired rotation. Step  3-Inspect  hose  for  oblivious  kinks,  flat  spots,  or  obstructions.    Remove  obstructions  or  replace  hoses  as required (refer to applicable vehicle manual). Step  4-Check  for  torque  requirements  in  excess  of  wrench  capacity.    Do  not  attempt  to  turn  any  fastener requiring torque in excess of 850 pound-feet (lb-ft) (1152 Newton-meters [N•m] ). Step 5-Inspect impact head for worn, loose, or damaged parts.  Also check for proper lubricant (see para. 4-11). Replace worn, damaged, or broken parts.  Properly lubricate head (see para. 4-11). Step  6-Test  hydraulic  impact  wrench  to  ensure  full  power  is  developed.    If  hydraulic  impact  wrench  fails  to develop full power, repair hydraulic impact wrench (see para. 4-17). 3.  Hydraulic Impact Wrench Operation Is Sluggish or Erratic (Motor Fails to Respond). Step 1-Refer to applicable vehicle manual and ensure that vehicle is supplying sufficient oil for proper hydraulic impact wrench operation. Set vehicle control for proper hydraulic impact wrench operation. 4-5

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