TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 457 of 926
TM 9-2320-283-20-1
STE/ICE TROUBLESHOOTING.
2-16.
STE/ICE DESCRIPTION AND OPERATION (Continued).
used
to make the measurement.
The use
of the VTM through the
DCA and TK is referred
to as the combined mode.
Additional tests
can be done that involve manually probing and/or connecting transducers to appropriate test points.
Operating power for the VTM is drawn from the M915A1 truck batteries or some equivalent source.
Power is routed to the
VTM through the DCA connected to the batteries.
The
STE/ICE
general purpose
testing capabilities
that
may
be
applied to the M915A1 truck are 0-1000 psig pressure, 0 to 45-volts dc, and 0-40k ohms resistance.
The following
control functions can be performed
in conjuction with
the special test:
interleave (displays rpm with next test), display
maximum value, display minimum value, and display peak-to-peak value.
(2)
Controls and Indicators.
The controls and readout display on the VTM are illustrated.
The following
paragraphs describe how the controls
are used and how the display functions.
(a)
Power Switch (PUSH ON/PULL OFF).
The power switch controls DC power to the VTM.
The VTM
can operate from a 12
volt or
24 volt battery
system. When the power switch is pushed in (PUSH ON), the VTM power is
on.
To shut the VTM off, pull out the power
switch (PULL OFF).
The power switch
contains a 4-ampere circuit
breaker.
The power
switch will pop out
automatically
if something is wrong which causes the VTM to use
more power
than it should.
If the switch pops out, check your hookup carefully and try again before returning the VTM to Direct
Support Maintenance.
(b)
TEST SELECT Switches.
The TEST
SELECT switches are used to select the
actual test
to be
performed.
There are
ten positions
on each switch numbered 0 through 9.
The number dialed into these switches is
read by the VTM when
you press the test button.
Changing the TEST SELECT switch position has no effect until the
TEST button is pushed.
(c)
TEST Button.
Depressing and releasing the TEST button causes the test measurement to begin.
Observe the measured value on the readout display.
The reading will be in units normally used for the particular truck
measurement. These units are listed on the VTM’s flip cards, in the GO/NO-GO test pages, and on the Vehicle Test Card
Sheets in the back of this TM.
The TEST button must be pressed and immediately released.
Depressing and holding the
TEST button down initiates an offset test.
Offset tests
are described in paragraphs 2-20
and 2-21, and in TM 9-4910-
571-12&P.
(d)
Readout Display.
The readout display will show different types of readouts during testing up to a
maximum of 4-characters (for example .8.8.8.8). The types of readouts are described in detail in paragraph 2-16, d., (3)
"Readouts", with a summary following:
2-332
Back to Top
