TM  10-3930-669-20 2-16.  DRIVE AXLE SYSTEM TROUBLESHOOTING. This paragraph covers the Drive Axle System Troubleshooting.  The Axle Fault Index, Table 2-7, lists faults for the drive axle of the forklift. Table 2-7.  Axle Fault Index Fault No. Troubleshooting Procedure Page 1. Drive Axle Overheating  ........................................................................................... 2-332 2. Drive Axle Noise Greater Under Power Than During Coast ...................................... 2-380 3. Drive Axle Engaging Harshly When Switching Direction  .......................................... 2-384 2-331