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