TM-9-2815-220-24

AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

  TM-9-2815-220-24 - Page 277 of 1563

TM 9-2815-220-24
FUEL/WATER SEPARATOR OPERATION TESTS
0042 00
WP 0042 00-7
TESTS (Continued)
3. Control unit test.
U
CAUTION
Never touch a sensor probe to the positive terminal of the power
source.
Damage to equipment can occur.
NOTE
A red band identifies top sensor probe (high-level) and it is also the
longer of the two probes.
The lower probe is the low-level probe and
is the shorter probe.
a.
With power supply connected, lightly press the tip of the low-level probe (15) to the
negative (-) terminal of the 24-volt dc power supply.
The voltmeter should register zero
voltage.
b.
Continue holding the low level probe (15) onto the negative (-) terminal and at the same
time press the tip of the high-level probe (14) onto the negative terminal.
The voltmeter
should now register 24 volts.
c.
Remove the high-level probe (14) only.
The meter should continue to register 24 volts for
18 (
±
3) seconds and then drop to zero volts.
14
15
Meter Negative Lead
Meter Positive Lead


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