TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 1063 of 1275

TM9-2350-311-20-1

12-1 AIR PURIFIER

This task covers:

a. Testing

b. Removal

c. Disassembly

d. Assembly

e. Installation

Applicable Configurations

Materials/Parts

M109A4/M109A5

Lockwashers (4) (item 85, A

PPX

G)

Lockwasher (item 95, Appx G)

General mechanic’s tool kit (item 64, A

PPX

H)

Airflow tester (item 62, A

PPX

H)

TM 3-6660-316-10

TM 10-277

FM 3-5

NOTE

For additional information, refer to TM 3-6660-316-10. For information on NBC

decontamination refer to FM 3-5.

a. Testing

1

2

3

4

5

6

7

8

9

10

11

Remove spring clip (1) from air purifier (2).

Disconnect hose (3) from air purifier manifoid (4). Cover opening with solid airflow cap (5).

Cover two purifier openings with airflow caps (5) having small holes.

Disconnect hose (6) at driver’s heater.

Remove calibrated orifice from tester case.

Position magnehelic gage where it can be easily read, and zero gage using adjustment screw.

Attach hose (6) to calibrated orifice.

Turn on MASTER power switch.

Turn on NBC power switch.

Read gage. If airflow is from 2.0 to 4.7 in. H

2

0 (0.50 to 1.17 kPa), it is acceptable. Proceed to step

is not acceptable, proceed to step 11.

Adjust airflow by inserting screwdriver through left center slot (7) and into adjuster. Turn adjuster

counterclockwise to increase and clockwise to decrease airflow.

12. If airflow

12-2

Tool s

References