Figure 5-2. M1A1 air purifier precleaner.

TM 3-4240-201-13

of the M1A1 air purifier precleaner (fig. 5-2) is required,

c. Assembly. Make sure the nameplate is in the

remove it as a unit from the precleaner and housing

holder (M2A1 air purifier only) and that it is legible. If the

(1) Remove the end plate (a above).

nameplate is damaged, illegible, or missing, replace it.

(2) Remove four screws that fasten the

Be sure that a rubber seal (fig. 5-2) is on each dust

mounting plate to the housing.

separator tube.

d. Precleaner and Housing Assembly. Repair the

(3) If the nameplate on the housing is

fastened by four screws (rather than rivets) back the two

precleaner and housing assembly if it was accidentally

screws at the bottom of the nameplate out of the housing

damaged, improperly alined, or dirty. straighten the

so that the mounting plate will slide free of the housing.

housing so that the gas and particulate filters fit tightly

The centrifugal fan, the dust separator, and the mounting

when they are installed in it.

plate are removed as a unit.

e. Installation.

Instructions for assembling the

(4) Remove four screws and lockwashers

MIA1 air purifier precleaner are the reverse of the

that fasten the mounting plate to the floating anchor nuts.

procedure contained in paragraph b above.

Remove four screws, lockwashers, and nuts that fasten

f. Airflow Test. Test for 1.75 to 2.3 cfm of airflow

the receptacle connector to the switch cup. Removing

at each headpiece using the filter unit gasparticulate

these screws also frees the electric wire leading to the

airflow tester (FSN6680-436

electric motor. Replace the receptacle connector,

terminal lug, and the switch cup as necessary.

Figure 5-2. M1A1 air purifier precleaner.

5-2