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 173 of 1563

TM 9-2815-220-24

CLEAN AIR SYSTEM TROUBLESHOOTING

0026 00

THIS WORK PACKAGE COVERS:

Troubleshooting Table and Diagnostic Tests

INITIAL SETUP:

Tools:

General mechanic’s tool kit (item 121, WP 0176)

Personnel Required:

Track Vehicle Repairer (2) 63H10

Equipment Conditions:

Engine installed in vehicle or ground hop.

MALFUNCTION 1:

Abnormal operation of dust detector system (power pack warning lamp and dust detector

warning lamps ON, with pressure switch plunger(s) visible).

PROBABLE CAUSE

CORRECTIVE ACTION

a. Restricted filter strip.

(1) Service dust detector filter strip, refer to

pertinent vehicle technical manual.

b. Loose or defective hose clamps on

turbosupercharger air inlet hose.

(1) Repair or replace as necessary.

c. Defective or missing seals at

turbosupercharger air inlet elbow or air

cleaner air outlet elbow.

(1) Repair or replace as necessary.

d. Restricted orifices in turbosupercharger

compressor housing and cover.

(1) Remove dust detector filter strip cover.

Clean all orifices and cavities.

Service

filter strip.

e. Defective pressure switch.

(1) Remove pressure switch (WP 0082,

Turbosupercharger Dust Detector System

Replacement).

Perform pressure switch

operational check.

PROCEDURE

OBSERVATION

ANALYSIS

Install an adapter in the

bottom (low pressure)

opening in pressure switch.

Pressure switch plunger pops up.

Switch is operational.

Suck on connector with the

mouth.

Pressure switch plunger does not

pop up.

Switch needs to be

replaced.

Remove

adapter and replace

switch.

No continuity.

Switch defective.

Replace pressure switch.

Using a voltmeter, check

for continuity across the

two pressure switch

connector pins.

There is continuity.

Switch is operational.

WP 0026 00-1