Section IV. MAINTENANCE INSTRUCTIONS

TM 3-4240-201-13

Section IV. MAINTENANCE INSTRUCTIONS

(1) Remove four screws and lockwashers that

4-7.

Filter Replacement

fasten the manifold assembly (fig. 4-3) to the air purifier

housing. Pull the manifold assembly from the housing.

a. Description. The gas filter is about 1 inch thicker

than the particulate filter. The particulate filter has two

(2) Remove the gas filter and the particulate

rubber gaskets.

The gas filter has a felt gasket

filter from the housing. If the filters are to be reinstalled,

cemented to the retainer. The particulate filter rests

mark the particulate filter housing so that when it is

against the bulkhead of the air purifier. The gas filter is

reinstalled, airflow through it will be in the same direction

installed on top of the particulate filter with the felt gasket

as before removal.

facing out. The manifold assembly presses against the

(3) Decontaminate the surfaces of air purifier

felt gasket of the gas filter. The manifold is fastened in

housing(TM 3-220).

Replace the precleaner

and

place to the housing by four screws and lockwashers.

housing assembly if required.

b. Removal.

c. Air Deflector. Remove screw and lockwasher

WARNING

holding air deflector in place. Remove air deflector.

DO NOT throw away damaged or

Inspect air deflector for damage and contamination.

unusable filters as ordinary trash.

Clean as necessary. Replace a damaged air deflector.

d. Installation.

DO turn in damaged or unusable filters

(1) Place the particulate filter in the housing

to your hazardous waste management

so that air will flow through it in the direction marked on

office or Defense Reutilization and

the filter housing. Make sure the filter rests against the

Marketing Office (DRMO).

bulkhead inside the air purifier housing.

(2) Place the gas filter in the housing so that it

The unit commander or senior officer in

rests on the gasket of the particulate filter surface. Make

charge of maintenance personnel

sure that the deeply recessed side containing the felt

assigned to remove the contaminated

gasket of the gas filter is turned toward the manifold

gas and particulate filters must prescribe

assembly end of the air purifier.

the necessary protective clothing (TM

(3) Install the manifold assembly. Fasten the

10-277) to be worn during this operation.

manifold assembly to the housing using the four screws

He must also prescribe the necessary

with lockwashers that were removed. Connect the

safety measures to be followed including

electrical plug connector to the electric receptacle

the NBC decontamination (FM 3-5).

connector (fig. 1-4).

This must be performed before the new

filters are installed. Failure to wear

4-8.

Precleaner and Housing Assembly

protective clothing or follow safety

measures may result in injury or death.

Organizational maintenance is authorized to replace the

precleaner and housing assembly as one piece. Do this

The

headpieces

should

by removing the manifold assembly and filters as

decontaminated after each use.

described in paragraph 4-7b.

Disconnect the power cable with 900

plug connector from the air purifier

4-9.

Transformer

before performing maintenance.

To remove the transformer, disconnect the three power

cables. To install the transformer, connect the three

power cables. Connect the elec-

4-4