M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 1/TASK 1
the wiping rag, dampened with dry cleaning solvent, and clean the area
around the brake access covers. When this area is clean, SSG Taylor removes
eight screws and lockwashers from the left access cover and eight screws and
lockwashers from the right access cover.
Once the access covers are
removed, he removes the gaskets from the backside of each cover and discards
The helper is then directed to press the brake pedal to the floor, while SSG
Taylor observes the brake shaft pointer to see if it goes past the scribe
line. At this point in the troubleshooting procedure, SSG Taylor is asked
the question, "Does the brake shaft pointer go past the scribe line?" The
brake shaft pointer did not go past the scribe line, so SSG Taylor is
directed to reference letter P.
At reference letter P, SSG Taylor is directed to install two new gaskets to
the backside of the brake access covers.
Once the new gaskets are
installed, SSG Taylor installs the access covers with their attaching screws
and lockwashers. He torques the screws to between 72 and 96 in-lb, using
the torque wrench and socket. After the covers have been reinstalled, SSG
Taylor directs the helper to press the brake pedal again. SSG Taylor checks
to see if the brake assembly shaft rotates with the pedal. He also checks
the connection between the brake assembly shaft, the connecting link, and
He is again asked a question.
This time he is asked if the
parts are bent, binding, or missing.
Since SSG Taylor noticed that the
brake assembly shaft and one of the connecting links were bent, the answer
to the question is "yes."
SSG Taylor is then directed to repair the bent components, following the
procedures contained on page 11-101 of TM 9-2350-252-20-1-4.
damaged components have been repaired and/or replaced, SSG Taylor is
directed to verify NO FAULTS FOUND.
This means that he repeats the
troubleshooting procedures to ensure that the malfunction has been properly
corrected and that there are no additional malfunctions.
In the three troubleshooting examples, SSG Taylor arrived at three different
In the first, he did not really find a cause for the
malfunction. He was then directed to repeat the