Section II. PREVENTIVE MAINTENANCE CHECKS

TM 3-4240-201-13

Section II. PREVENTIVE MAINTENANCE CHECKS

during preventive maintenance servicing must be

4-3. General

corrected if corrective action is authorized in the

This section contains instructions for organizational

maintenance allocation chart (MAC). If corrective action

maintenance who is responsible for preventive

is not authorized, notify direct support maintenance

maintenance of the filter unit.

The preventive

4-4. Checklist

maintenance must be performed at the interval

prescribed. The interval of maintenance is based on

Table 4-1 lists the preventive maintenance checks and

normal operation and will be reduced or extended

services.

depending on operating conditions. Defects discovered

Table 4-1. Preventive Maintenance checks and Services--Monthly Schedule

Total time required: 1.7 hours

Sequence No.

Item to be inspected procedure

Work

Time

(M/H)

Air Purifier. Check for dents, loose connections, and loose or missing part. Repair if

authorized.

Airflow Control Capt. Check for being damaged or mining. Replace as necessary

Negligible

WARNING

DO NOT throw away damaged or unusable filters as ordinary

trash. DO turn in damaged or unusable filters to your

hazardous waste management office or Defense Reutilization

and Marketing Office (DRMO).

Gas and Particulate Filters. Check with operator if any criteria in table 2-1 have been

0.5

met. Replace filters, if required.

Battery. Check battery cells with hydrometer for specific gravity of 1275 to 1290.

0.3

Check and add distilled water to each battery cell as necessary. Check that battery

is not damaged. Recharge battery when required. Make repairs or replace battery.

Transfer. Check transformer case and cable leads for damage. Check that toggle

0.1

switch is not broken Make repairs if authorized or notify direct support maintenance

Hose Assemblies. Check hoses (approx, 54 feet of hose) for loose or broken fittings.

0.4

Check for holes or leak Check hoses for unusual wear, damage, or missing part.

Repair as necessary.

Headpieces. Check headpieces for leanness and damage. Replace as necessary

0.1

Cairrera. Check carriers for damage and cleanliness. Replace as necessary -----------

0.1

Section III. TROUBLESHOOTING

description of probable causes and corrective actions.

4-5.

General

4-6.

Troubleshooting Table

This section provides information that is useful to

organizational maintenance in diagnosing and correcting

Table 4-2, troubleshooting, lists information to help

malfunctions.

Each malfunction is followed by a

organizational maintenance maintain the filter unit.

Table 4-2. Troubleshooting

Item

No.

Malfunction

Probable cause

Corrective action

Air purifier does not operate _--

Faulty connections in air purifier ..........

Replace precleaner and housing assem-

bly. Save manifold assembly, screws,

lockwasher, airflow control caps, gas

filter, and particulate filter for reuse.

Lack of air at headpieces -----

Blocked hose ..................................

a. Remove foreign matter from inter-

ior of ho

Leak in hose ..................................

b. Replace hose

Hose not connected to Y-connecc ..

.a. Connect hoses

ors, headpiecea, or air purifier or

headpiec.

Defective air purifier .......................

Replace precleaner and housing as-

sembly. Save manifold assembly,

screws, lockwahers, airflow con-

trol caps, gas filter, and particu-

late filter for reuse.

Air purifier operates on a c but

Faulty transformer . .........................

Replace transformer.

not on dc

Battery discharged .........................

Recharge battery.

Change 1 4-3