TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 648 of 828
TM 9–2350–311–20–2
17–10
Change 2
17–3 M2A2 AIR PURIFIER AND BRACKET — CONTINUED
b.
Disassembly
WARNING
To prevent possible chemical or biological agent casualties, contaminated filters must be removed
and disposed of only by adequately trained personnel (FM 3–3 and FM 3–4). The unit commander
or senior officer in charge of maintenance personnel assigned to remove and dispose of contami-
nated gas filters must prescribe necessary protective clothing (TM 10–277) to be worn during re-
placement.
1
Remove remaining three machine screws (7) and three lockwashers (8) from top of M2A2 air purifier (9).
Discard lockwashers.
2
Remove manifold assembly (15).
3
If necessary for replacement, remove four protective dust caps (15.1) from manifold assembly (15).
CAUTION
Do not allow moisture to come in contact with filter material.
NOTE
If filters are to be removed and reused, mark arrow on side showing direction of air flow.
4
Tilt housing and precleaner (16) and remove gas filter (17), and particulate filter (18).
5
If necessary for replacement, remove spring clip (18.1) from housing and precleaner (16).
c.
Cleaning
Clean manifold assembly (15), housing and precleaner (16), gas filter (17), and particulate filter (18) with
clean, damp cloth.
d.
Inspection
1
Inspect housing and precleaner (16), gas filter (17), and particulate filter (18) for damage. Replace if dam-
aged. Replacement criteria are:
(a)
Physical and/or water damage.
(b)
Excessive breathing resistance when M3 electrical air heaters are in use.
(c)
Approximately 15 hours after exposure during toxic chemical operation.
(d)
Peacetime climate replacement criteria in accordance with AR 70–38.
(e)
Supply bulletin announcing unserviceable lot.
(f)
When directed by supervisor.
(g)
At beginning of combat operations where cyanogen chloride (CK) is expected.
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