MAINTENANCE OF M939 SERIES VEHICLES - OD1661 - LESSON 1/TASK 2
Once the necessary tools have been gathered at the vehicle, SSG
Williams ensures that the vehicle is configured according to the
procedures listed in paragraphs 3a(1) thru 3a(5) on page 34 of this
task.
Once this has been done, SSG Williams is ready to begin the
troubleshooting procedure.
Step 1.
The first thing that SSG Williams does is check the ether
cylinder. This is done by removing the ether cylinder from the valve
and shaking the cylinder to ensure that it contains liquid.
Since
the cylinder contains ether, SSG Williams will proceed to step 2.
Step 2.
In step 2, SSG Williams checks the ether valve for proper
operation.
This is done by disconnecting the tubing at the ether
valve and pressing the ether start switch. A small amount of ether
should be released by the ether valve. In this case a small amount
of ether was ejected from the valve, so SSG Williams will proceed to
troubleshooting step 3.
Step 3.
In this step, SSG Williams checks the thermal close valve
and the thermal close valve tubing for restrictions. To perform this
step, SSG Williams first disconnects the ether valve from the thermal
close valve tubing at the ether valve. Once this has been done, SSG
Williams disconnects the thermal close valve from the atomizer tubing
at the thermal close valve.
With the thermal close valve cold, SSG Williams blows compressed air
into the tubing at the ether valve end to determine if the system is
clear.
Since the system is clear of restrictions and obstructions,
SSG Williams reconnects the thermal close valve to the atomizer
tubing at the thermal close valve.
Then he reconnects the ether
valve to the thermal close valve tubing at the ether valve.
After these procedures have been performed and no obstructions have
been found, SSG Williams proceeds to step 4.
Step 4.
In this step, SSG Williams checks the atomizer
and atomizer tubing for restrictions.
In order to do this
SSG
Williams
first
disconnects
the
tubing
between
the
thermal
close
valve
and
the
atomizer
at
the
thermal
close valve. After this has been done, he blows compressed air into
the
tubing
at
the
thermal
close
valve
end,
to
determine
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