INTRODUCTION TO HOW TO USE TROUBLESHOOTING
The purpose of direct and general support maintenance level troubleshooting is to diagnose carrier problems which are
reported to direct and general support maintenance. Troubleshooting tasks in this manual are common to all M113A3 FOV
carriers except where indicated. You should not begin direct and general support maintenance troubleshooting until all
operator and unit troubleshooting has been completed. You will perform four actions in direct and general support
Before starting a troubleshooting task, verify that reported problem is present in carrier.
After verifying the symptom, find the part that is causing problem.
Replace or adjust that part.
Check to make sure problem no longer exists, and that there are no other problems.
DEFINITIONS AND DESCRIPTIONS OF TROUBLESHOOTING PARTS
Troubleshooting tasks always have a beginning and an end. You will use task steps, test procedures, indexes, maintenance
tasks, and other technical manuals to troubleshoot. Troubleshooting uses the following terms that are not used in other kinds
The part that is not operating correctly and is causing the problem.
The problem reported by unit maintenance.
VERIFY NO FAULTS
After you have completed the corrective action, you must verify that no faults exist.
If the fault condition still exists, then the fault is not fixed or there is another fault.
If this happens, start at the beginning of the troubleshooting procedure until you
find and correct all faults. Always operate the system and/or vehicle to make sure
that you have corrected the reported problem. If troubleshooting does not identify a
faulty part, the vehicle is defective beyond the level of direct and general support
A troubleshooting procedure serves as a starting point for your troubleshooting work. You will branch in and out of
procedures as you work to find a fault. Also, you will correct the fault, and check that the fault has been corrected.
Locating the Correct Troubleshooting Procedure
Component/carrier arrives at shop.
Read DA Form 2404.
Verify that the problem on DA Form 2404 exists.
Look up carrier symptom in Troubleshooting Task Index and go to that task.
Perform the Troubleshooting Procedure
Make sure you have all items in INITIAL SETUP.
Perform required action(s) in Equipment Conditions.
Complete first block of task steps.