MAINTENANCE OF M939 SERIES VEHICLES - OD1661 - LESSON 1/TASK 2
GENERAL TROUBLESHOOTING RULES
(1) Question the vehicle operator to obtain any information that
might help determine the cause of the maintenance problem.
(2) Never overlook the chance that the maintenance problem could
be of simple origin. The problem could possibly be corrected with a
minor adjustment.
(3)
Use all senses to observe and locate troubles.
(4) Use test instruments or gages to help determine and isolate
(5) Always isolate the system where the malfunction occurs and
then locate the defective component.
3.
Mechanical Systems Troubleshooting
In the following paragraphs, the troubleshooting procedures for six
malfunctions from six of the 21 mechanical subsystems of the M939 FOV
will be discussed.
For the purposes of these paragraphs, we will
follow
a
fictitious
individual
as
he
or
she
performs
the
troubleshooting procedures.
The troubleshooting test results
described here are not the only possibilities.
For additional
information concerning troubleshooting the mechanical systems of the
M939, consult TM 9-2320-272-20-1.
a.
In the following paragraphs we
will follow SGT Elliott as she troubleshoots the malfunction: ENGINE
FAILS TO CRANK and reaches the conclusion that the starter is
defective.
One of the first things that SGT Elliott does is read DA Form 2404
and talk to the operator.
This is done so that she will have a
better understanding of the malfunction and to possibly gain any
additional information that may be helpful in troubleshooting.
Once
she
has
read
DA
Form
2404
and
talked
to
the
operator, SGT Elliott then reads through the troubleshooting
procedure
for
this
particular
malfunction
to
determine
the
necessary tools, special tools, and test equipment necessary to
33
Previous Page
