TM 5-6675-348-13&P
Table 3-7. Blade Pro Motor Grader Control System Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
Ensure Tracer Sonic Grade Controller (1) is within its operating range.
Step 1.
Adjust Tracer Sonic Grade Controller (1) to within 8 to 42 in. (20 to 107 cm) of
reference surface (2).
Ensure Tracer Sonic Grade Controller (1) is directly over reference surface (2).
Step 2.
Ensure Tracer Sonic Grade Controller (1) is vertical and plumb over reference
surface (2). Adjust Tracer Sonic Grade Controller (1) over reference surface.
Tracer Sonic Grade Controller (1) is not following string line closely enough.
Step 3.
Line up Tracer Sonic Grade Controller (1) over reference surface (2).
If using a string line, tie a brightly colored ribbon onto Tracer Sonic Grade
Controller Pole (3), marking your line of sight where pole intersects string line.
Tracer Sonic Grade Controller (1) is tracing something other than what you thought.
Step 4.
Carefully align Tracer Sonic Grade Controller (1), then place a pencil between
reference and ground. If the Tracer Sonic Grade Controller (1) gives you a
correction signal, you are not picking up the correct reference.